Wavefront shaping has revolutionized the control of light propagation through scattering media, transforming disordered speckles into highly focused optical spots. This breakthrough depends on the accurate and efficient retrieval of scattering matrices, which promises to unlock new possibilities in optical imaging, communication, and sensing. However, a major challenge persists: retrieving scattering matrices from direct intensity measurements, often hindered by the lack of effective prior knowledge or regularization constraints. In this study, we introduce the Gaussian-regularized adaptive statistical prior fast iterative shrinkage-thresholding algorithm (GRASP-FISTA), a novel method designed to overcome this challenge in phase retrieval for scattering media. By exploiting the statistical properties of scattering matrix elements—specifically their circular Gaussian distribution—we impose a robust statistical prior that enhances retrieval accuracy. Integrated with the Plug-and-Play FISTA framework, known for its rapid convergence, GRASP-FISTA offers an efficient and reliable solution to phase retrieval. Experimental validation on multimode fibers, ground glass, and chicken breast tissue demonstrates that GRASP-FISTA reduces iteration counts by 2–3 times, increases robustness against Gaussian noise, and improves reconstruction accuracy. By incorporating statistical constraints into gradient-descent-based methods, GRASP-FISTA significantly broadens the scope of phase retrieval, paving the way for new applications across diverse scattering processes.
{"title":"Retrieving Scattering Matrices With Gaussian Regularized Adaptive Statistical Prior","authors":"Zhengyang Wang, Daixuan Wu, Yuecheng Shen, Jiawei Luo, Jiajun Liang, Jiaming Liang, Zhiling Zhang, Dalong Qi, Yunhua Yao, Lianzhong Deng, Zhenrong Sun, Shian Zhang","doi":"10.1002/lpor.202500120","DOIUrl":"https://doi.org/10.1002/lpor.202500120","url":null,"abstract":"Wavefront shaping has revolutionized the control of light propagation through scattering media, transforming disordered speckles into highly focused optical spots. This breakthrough depends on the accurate and efficient retrieval of scattering matrices, which promises to unlock new possibilities in optical imaging, communication, and sensing. However, a major challenge persists: retrieving scattering matrices from direct intensity measurements, often hindered by the lack of effective prior knowledge or regularization constraints. In this study, we introduce the Gaussian-regularized adaptive statistical prior fast iterative shrinkage-thresholding algorithm (GRASP-FISTA), a novel method designed to overcome this challenge in phase retrieval for scattering media. By exploiting the statistical properties of scattering matrix elements—specifically their circular Gaussian distribution—we impose a robust statistical prior that enhances retrieval accuracy. Integrated with the Plug-and-Play FISTA framework, known for its rapid convergence, GRASP-FISTA offers an efficient and reliable solution to phase retrieval. Experimental validation on multimode fibers, ground glass, and chicken breast tissue demonstrates that GRASP-FISTA reduces iteration counts by 2–3 times, increases robustness against Gaussian noise, and improves reconstruction accuracy. By incorporating statistical constraints into gradient-descent-based methods, GRASP-FISTA significantly broadens the scope of phase retrieval, paving the way for new applications across diverse scattering processes.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"8 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143435704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Shared entanglement can significantly amplify classical correlations between systems interacting over a limited quantum channel. A natural avenue is to use entanglement of the same dimension as the channel because this allows for unitary encodings, which preserve global coherence until a measurement is performed. Contrasting this, a distributed task based on a qubit channel is demonstrated, for which irreversible encoding operations can outperform any possible coherence-preserving protocol. This corresponds to using high-dimensional entanglement and encoding information by compressing one of the subsystems into a qubit. Demonstrating this phenomenon requires the preparation of a 4D maximally entangled state, the compression of two qubits into one and joint qubit-ququart entangled measurements, with all modules executed at near-optimal fidelity. A proof-of-principle experiment is reported that achieves the advantage by realizing separate systems in distinct and independently controlled paths of a single photon. This result demonstrates the relevance of high-dimensional entanglement and non-unitary operations for enhancing the communication capabilities of standard qubit transmissions.
{"title":"Compression of Entanglement Improves Quantum Communication","authors":"Yu Guo, Hao Tang, Jef Pauwels, Emmanuel Zambrini Cruzeiro, Xiao-Min Hu, Bi-Heng Liu, Yun-Feng Huang, Chuan-Feng Li, Guang-Can Guo, Armin Tavakoli","doi":"10.1002/lpor.202401110","DOIUrl":"https://doi.org/10.1002/lpor.202401110","url":null,"abstract":"Shared entanglement can significantly amplify classical correlations between systems interacting over a limited quantum channel. A natural avenue is to use entanglement of the same dimension as the channel because this allows for unitary encodings, which preserve global coherence until a measurement is performed. Contrasting this, a distributed task based on a qubit channel is demonstrated, for which irreversible encoding operations can outperform any possible coherence-preserving protocol. This corresponds to using high-dimensional entanglement and encoding information by compressing one of the subsystems into a qubit. Demonstrating this phenomenon requires the preparation of a 4D maximally entangled state, the compression of two qubits into one and joint qubit-ququart entangled measurements, with all modules executed at near-optimal fidelity. A proof-of-principle experiment is reported that achieves the advantage by realizing separate systems in distinct and independently controlled paths of a single photon. This result demonstrates the relevance of high-dimensional entanglement and non-unitary operations for enhancing the communication capabilities of standard qubit transmissions.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"15 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yuting Xu, Zhen Chai, Xiaoqin Meng, Yan Xu, Jie Sun, Peng Zhou
Discrete optical system in optically pumped magnetometers (OPMs) presents a significant challenge to their integration into high-spatial-resolution magnetic field detection. Here, the electron spin polarization of <span data-altimg="/cms/asset/79044573-f1b7-4a00-aba0-15fa58fcc3d0/lpor202402292-math-0001.png"></span><math altimg="urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0001" display="inline" location="graphic/lpor202402292-math-0001.png"> <semantics> <mrow> <msup> <mrow></mrow> <mn>87</mn> </msup> <mi>Rb</mi> </mrow> $^{87}{rm Rb}$</annotation> </semantics></math> atoms using a fiber-coupled silicon nitride (<span data-altimg="/cms/asset/9f843b69-09ee-4426-8d74-1e55e846d121/lpor202402292-math-0002.png"></span><math altimg="urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0002" display="inline" location="graphic/lpor202402292-math-0002.png"> <semantics> <mrow> <msub> <mi>Si</mi> <mn>3</mn> </msub> <msub> <mi mathvariant="normal">N</mi> <mn>4</mn> </msub> </mrow> ${rm Si}_3{rm N}_4$</annotation> </semantics></math>) photonic integrated circuit (PIC) is demonstrated, by the way of delivering arrayed elliptically polarized light (EPL) into a vapor cell. Specifically, the photonic integrated circuit (PIC) transforms fiber-coupled 795 nm pump light via optical waveguides to eight divergent free-space beams, simultaneously converting linear polarized light (LPL) into EPL with an average polarization conversion efficiency of 71%. The <span data-altimg="/cms/asset/baaf7ca8-41d1-45a9-b810-6976be17c165/lpor202402292-math-0003.png"></span><math altimg="urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0003" display="inline" location="graphic/lpor202402292-math-0003.png"> <semantics> <mrow> <msub> <mi>Si</mi> <mn>3</mn> </msub> <msub> <mi mathvariant="normal">N</mi> <mn>4</mn> </msub> </mrow> ${rm Si}_3{rm N}_4$</annotation> </semantics></math> PIC-enabled OPM has detected the weak magnetic field with an optimal sensitivity of 0.53 pT <span data-altimg="/cms/asset/ab2581a9-6de3-42ac-8a3c-632e857c4496/lpor202402292-math-0004.png"></span><math altimg="urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0004" display="inline" location="graphic/lpor202402292-math-0004.png"> <semantics> <mo>·</mo> $cdot$</annotation> </semantics></math> <span data-altimg="/cms/asset/b29a0d7b-5a9b-407c-8e9c-e8f6e2b0b36e/lpor202402292-math-0005.png"></span><math altimg="urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0005" display="inline" location="graphic/lpor202402292-math-0005.png"> <semantics> <msup> <mi>Hz</mi> <mrow> <mo>−</mo> <mn>1</mn> <mo>/</mo> <mn>2</mn> </mrow> </msup> ${rm Hz}^{-1/2}$</annotation> </semantics></math> at 70Hz. This work presents an effective approach for manipulation of alkali atoms using a chip and, crucially, introduces a chip-based pump solution for OPMs. This approach contributes to the integration of nanophotonics with atomic systems, paving the way for future advancements in quantum sens
{"title":"Silicon Nitride-Photonics-Enabled Optical Pumping for Optically Pumped Magnetometer","authors":"Yuting Xu, Zhen Chai, Xiaoqin Meng, Yan Xu, Jie Sun, Peng Zhou","doi":"10.1002/lpor.202402292","DOIUrl":"https://doi.org/10.1002/lpor.202402292","url":null,"abstract":"Discrete optical system in optically pumped magnetometers (OPMs) presents a significant challenge to their integration into high-spatial-resolution magnetic field detection. Here, the electron spin polarization of <span data-altimg=\"/cms/asset/79044573-f1b7-4a00-aba0-15fa58fcc3d0/lpor202402292-math-0001.png\"></span><math altimg=\"urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0001\" display=\"inline\" location=\"graphic/lpor202402292-math-0001.png\">\u0000<semantics>\u0000<mrow>\u0000<msup>\u0000<mrow></mrow>\u0000<mn>87</mn>\u0000</msup>\u0000<mi>Rb</mi>\u0000</mrow>\u0000$^{87}{rm Rb}$</annotation>\u0000</semantics></math> atoms using a fiber-coupled silicon nitride (<span data-altimg=\"/cms/asset/9f843b69-09ee-4426-8d74-1e55e846d121/lpor202402292-math-0002.png\"></span><math altimg=\"urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0002\" display=\"inline\" location=\"graphic/lpor202402292-math-0002.png\">\u0000<semantics>\u0000<mrow>\u0000<msub>\u0000<mi>Si</mi>\u0000<mn>3</mn>\u0000</msub>\u0000<msub>\u0000<mi mathvariant=\"normal\">N</mi>\u0000<mn>4</mn>\u0000</msub>\u0000</mrow>\u0000${rm Si}_3{rm N}_4$</annotation>\u0000</semantics></math>) photonic integrated circuit (PIC) is demonstrated, by the way of delivering arrayed elliptically polarized light (EPL) into a vapor cell. Specifically, the photonic integrated circuit (PIC) transforms fiber-coupled 795 nm pump light via optical waveguides to eight divergent free-space beams, simultaneously converting linear polarized light (LPL) into EPL with an average polarization conversion efficiency of 71%. The <span data-altimg=\"/cms/asset/baaf7ca8-41d1-45a9-b810-6976be17c165/lpor202402292-math-0003.png\"></span><math altimg=\"urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0003\" display=\"inline\" location=\"graphic/lpor202402292-math-0003.png\">\u0000<semantics>\u0000<mrow>\u0000<msub>\u0000<mi>Si</mi>\u0000<mn>3</mn>\u0000</msub>\u0000<msub>\u0000<mi mathvariant=\"normal\">N</mi>\u0000<mn>4</mn>\u0000</msub>\u0000</mrow>\u0000${rm Si}_3{rm N}_4$</annotation>\u0000</semantics></math> PIC-enabled OPM has detected the weak magnetic field with an optimal sensitivity of 0.53 pT <span data-altimg=\"/cms/asset/ab2581a9-6de3-42ac-8a3c-632e857c4496/lpor202402292-math-0004.png\"></span><math altimg=\"urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0004\" display=\"inline\" location=\"graphic/lpor202402292-math-0004.png\">\u0000<semantics>\u0000<mo>·</mo>\u0000$cdot$</annotation>\u0000</semantics></math> <span data-altimg=\"/cms/asset/b29a0d7b-5a9b-407c-8e9c-e8f6e2b0b36e/lpor202402292-math-0005.png\"></span><math altimg=\"urn:x-wiley:18638880:media:lpor202402292:lpor202402292-math-0005\" display=\"inline\" location=\"graphic/lpor202402292-math-0005.png\">\u0000<semantics>\u0000<msup>\u0000<mi>Hz</mi>\u0000<mrow>\u0000<mo>−</mo>\u0000<mn>1</mn>\u0000<mo>/</mo>\u0000<mn>2</mn>\u0000</mrow>\u0000</msup>\u0000${rm Hz}^{-1/2}$</annotation>\u0000</semantics></math> at 70Hz. This work presents an effective approach for manipulation of alkali atoms using a chip and, crucially, introduces a chip-based pump solution for OPMs. This approach contributes to the integration of nanophotonics with atomic systems, paving the way for future advancements in quantum sens","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"80 3 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Evgueni F. Martynovich, Anastasia S. Frolova, Alexander L. Rakevich
A new nonlinear volumetric photographic material based on a KCl crystal with activating doping with thallium salt has been created. This is a new medium of a new class of functional materials that has been forming in recent years and are intended for visualization, recording, digitization, storage, and study of 3D patterns of highly nonlinear interaction of femto- and attosecond laser pulses with optical media. In a KCl crystal, two new types of previously unknown, optically and thermally stable luminescence centers have been created for the first time. They form a latent image and allow its visualization. They are induced by laser radiation and have the following main characteristics: the maximum of the luminescence band is 640 nm, absorption is 423 nm, and the luminescence decay time constant is 35 ns for the first center. For the second center, these characteristics have the following values, respectively, 440, 365 nm, and 1.3 µs. The created material is also suitable for the production of volumetric optical media for direct laser recording of visual or digital information.
{"title":"Nonlinear 3D Photographic Material With Luminescent Visualization of Images","authors":"Evgueni F. Martynovich, Anastasia S. Frolova, Alexander L. Rakevich","doi":"10.1002/lpor.202401252","DOIUrl":"https://doi.org/10.1002/lpor.202401252","url":null,"abstract":"A new nonlinear volumetric photographic material based on a KCl crystal with activating doping with thallium salt has been created. This is a new medium of a new class of functional materials that has been forming in recent years and are intended for visualization, recording, digitization, storage, and study of 3D patterns of highly nonlinear interaction of femto- and attosecond laser pulses with optical media. In a KCl crystal, two new types of previously unknown, optically and thermally stable luminescence centers have been created for the first time. They form a latent image and allow its visualization. They are induced by laser radiation and have the following main characteristics: the maximum of the luminescence band is 640 nm, absorption is 423 nm, and the luminescence decay time constant is 35 ns for the first center. For the second center, these characteristics have the following values, respectively, 440, 365 nm, and 1.3 µs. The created material is also suitable for the production of volumetric optical media for direct laser recording of visual or digital information.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"131 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sandra Soriano-Díaz, Jaume Noguera-Gómez, Juan P. Martínez-Pastor, Pablo P. Boix, Rafael Abargues, Isaac Suárez
Metal halide perovskites’ optoelectronic properties are particularly interesting for lasers, yet obtaining efficiently the required charge carrier density can be challenging. Photon recycling, a critical process in optoelectronic devices, is harnessed here to enable lasing under a low threshold in a system based on MAPbBr3 nanocrystals (NCs). This is achieved in a waveguide structure where the NCs are grown in-situ within a Ni(AcO)2 matrix, offering a cost-effective and straightforward approach for producing a high-quality active material with exceptional optical properties and outstanding photoluminescence quantum yield. The film contains two distinct NCs populations, sized 5 and 50 nm, enabling emitted light from smaller NCs to be reabsorbed by larger ones. The concentration of NCs is optimized to enhance photons recycling across 2–3 mm long waveguide structures. The propagating flux of emitted light plays an important role in facilitating waveguided stimulated emission, controlling the emission wavelength, and significantly lowering the amplified stimulated emission threshold to Pth≈1 µJ cm−2, which is three times smaller than a similar device without photon recycling. The device also exhibits narrow and stable emission lines with an exceptionally high-quality factor (≈10⁴), a result of random lasing modes caused by the formation of scattering loops through the large NCs.
{"title":"Photon Recycling Triggered Amplified Spontaneous Emission in MAPbBr3-Ni(AcO)2 Nanocomposite Waveguides","authors":"Sandra Soriano-Díaz, Jaume Noguera-Gómez, Juan P. Martínez-Pastor, Pablo P. Boix, Rafael Abargues, Isaac Suárez","doi":"10.1002/lpor.202401920","DOIUrl":"https://doi.org/10.1002/lpor.202401920","url":null,"abstract":"Metal halide perovskites’ optoelectronic properties are particularly interesting for lasers, yet obtaining efficiently the required charge carrier density can be challenging. Photon recycling, a critical process in optoelectronic devices, is harnessed here to enable lasing under a low threshold in a system based on MAPbBr<sub>3</sub> nanocrystals (NCs). This is achieved in a waveguide structure where the NCs are grown in-situ within a Ni(AcO)<sub>2</sub> matrix, offering a cost-effective and straightforward approach for producing a high-quality active material with exceptional optical properties and outstanding photoluminescence quantum yield. The film contains two distinct NCs populations, sized 5 and 50 nm, enabling emitted light from smaller NCs to be reabsorbed by larger ones. The concentration of NCs is optimized to enhance photons recycling across 2–3 mm long waveguide structures. The propagating flux of emitted light plays an important role in facilitating waveguided stimulated emission, controlling the emission wavelength, and significantly lowering the amplified stimulated emission threshold to P<sub>th</sub>≈1 µJ cm<sup>−2</sup>, which is three times smaller than a similar device without photon recycling. The device also exhibits narrow and stable emission lines with an exceptionally high-quality factor (≈10⁴), a result of random lasing modes caused by the formation of scattering loops through the large NCs.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"9 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Phosphor color converters in the form of ceramics and films are key components in laser-driven solid-state lighting, but the high temperature (> 500 °C) required to densify them usually leads to a high loss in quantum efficiency and thermal stability. In this work, a sintering-free method is reported to fabricate efficient and thermally robust phosphor films on an aluminum substrate by using an Al2O3 inorganic glue at room temperature. The sintering-free method enables to maintain the initial photoluminescence properties of phosphor particles in the film and thus obtains loss-free phosphor films. The Y3Al5O12:Ce-Al2O3 composite phosphor film has a luminance saturation threshold of 16.5 W mm−2, and allows to generate laser-driven white light with a luminous flux of 1680 lm, luminous efficiency of 205 lm W−1, and Correlated Color Temperature (CCT) of 6778 K. Dual-phosphor films consisting of yellow, red or green phosphors are also fabricated to achieve tunable color temperatures and high color rendering properties of white light. The sintering-free approach provides an interesting solution to prepare damage-free and thermally robust phosphor films for laser-driven solid-state lighting.
{"title":"Sintering-Free Phosphor Films for Laser-Driven Lighting","authors":"Haiyang Wen, Peng Zheng, Sheng Lin, Tianliang Zhou, Rong-Jun Xie","doi":"10.1002/lpor.202402260","DOIUrl":"https://doi.org/10.1002/lpor.202402260","url":null,"abstract":"Phosphor color converters in the form of ceramics and films are key components in laser-driven solid-state lighting, but the high temperature (> 500 °C) required to densify them usually leads to a high loss in quantum efficiency and thermal stability. In this work, a sintering-free method is reported to fabricate efficient and thermally robust phosphor films on an aluminum substrate by using an Al<sub>2</sub>O<sub>3</sub> inorganic glue at room temperature. The sintering-free method enables to maintain the initial photoluminescence properties of phosphor particles in the film and thus obtains loss-free phosphor films. The Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce-Al<sub>2</sub>O<sub>3</sub> composite phosphor film has a luminance saturation threshold of 16.5 W mm<sup>−2</sup>, and allows to generate laser-driven white light with a luminous flux of 1680 lm, luminous efficiency of 205 lm W<sup>−1</sup>, and Correlated Color Temperature (CCT) of 6778 K. Dual-phosphor films consisting of yellow, red or green phosphors are also fabricated to achieve tunable color temperatures and high color rendering properties of white light. The sintering-free approach provides an interesting solution to prepare damage-free and thermally robust phosphor films for laser-driven solid-state lighting.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"3 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417802","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Topological protection provides an appealing chance to suppress the backscattering loss and wave localization. The emerging broadband topological slow-light waveguides are promising for many on-chip applications. However, topological slow-light waveguides so far are limited to single mode, multiple slow-light modes are still unexplored which can promote the transmission capacity and bring in novel functionalities. Here, through Brillouin zone winding induced by side-coupled resonator arrays, topological one-way multimode waveguides with group velocity selectivity resulting from mode parity matching are demonstrated. One-way modes with a large group velocity contrast and dual slow light modes are respectively obtained. The conversion between two modes with distinct group velocity due to the perturbation of mirror symmetry is also observed. Furthermore, in line perturbed one-way waveguides, near-perfect mode fidelity, and backscattering immunity against strong asymmetric disorders is simultaneously achieved. The results reveal exciting opportunities toward the exquisite group velocity manipulation for slow-light applications.
{"title":"Selective Broadband Topological Slow Light in Multimode Waveguides","authors":"Tianji Liu, Satoshi Iwamoto, Wei Li","doi":"10.1002/lpor.202401176","DOIUrl":"https://doi.org/10.1002/lpor.202401176","url":null,"abstract":"Topological protection provides an appealing chance to suppress the backscattering loss and wave localization. The emerging broadband topological slow-light waveguides are promising for many on-chip applications. However, topological slow-light waveguides so far are limited to single mode, multiple slow-light modes are still unexplored which can promote the transmission capacity and bring in novel functionalities. Here, through Brillouin zone winding induced by side-coupled resonator arrays, topological one-way multimode waveguides with group velocity selectivity resulting from mode parity matching are demonstrated. One-way modes with a large group velocity contrast and dual slow light modes are respectively obtained. The conversion between two modes with distinct group velocity due to the perturbation of mirror symmetry is also observed. Furthermore, in line perturbed one-way waveguides, near-perfect mode fidelity, and backscattering immunity against strong asymmetric disorders is simultaneously achieved. The results reveal exciting opportunities toward the exquisite group velocity manipulation for slow-light applications.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"1 1 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Zezhong Yang, Song Zheng, Sifan Zhuo, Shisheng Lin, Tao Pang, Lingwei Zeng, Jing Wang, Ping Lu, Feng Huang, Daqin Chen
For laser-driven white light sources, phosphor-in-glass films (PiGFs), typically sintered onto substrates with high-thermal conductivity, are developed and emerged as the leading materials. However, compared to other all-inorganic color converters, such as single crystals, transparent ceramics, PiGF suffers from a low saturation threshold, poor thermal stability and limited irradiation durability, which restricts its practical applications. To overcome these limitations, in this study, a series of h-BN-YAG:Ce3+ PiGF is developed on opaque Al2O3/transparent Al2O3 (B-Y PiGF@o/t-Al2O3) by directly incorporating high-thermal-conductivity fillers into the PiGF. The selective incorporation of h-BN establishes a local heat conduction network, significantly increasing the saturation threshold and luminous flux. Through optimization, a maximum luminous flux of 6015.46 ± 14.46 lm with a saturation threshold of 16.15 ± 0.48 W mm−2 is achieved in reflective excitation mode, outperforming previous high-performance PiGFs. The addition of h-BN both enhanced heat dissipation and improved the uniformity of white light output in transmissive excitation mode, addressing the “yellow ring” effect commonly seen in laser-driven lighting. The application potential of the developed composite has been proven ranging from automotive headlights to medical lighting, offering a path toward enhanced brightness, more efficient, and operational-stable next-generation lighting technologies.
{"title":"Toward Laser-Driven Lighting with High Overall Optical Performance: Thermally Robust Composite Phosphor-in-Glass Film","authors":"Zezhong Yang, Song Zheng, Sifan Zhuo, Shisheng Lin, Tao Pang, Lingwei Zeng, Jing Wang, Ping Lu, Feng Huang, Daqin Chen","doi":"10.1002/lpor.202401798","DOIUrl":"https://doi.org/10.1002/lpor.202401798","url":null,"abstract":"For laser-driven white light sources, phosphor-in-glass films (PiGFs), typically sintered onto substrates with high-thermal conductivity, are developed and emerged as the leading materials. However, compared to other all-inorganic color converters, such as single crystals, transparent ceramics, PiGF suffers from a low saturation threshold, poor thermal stability and limited irradiation durability, which restricts its practical applications. To overcome these limitations, in this study, a series of h-BN-YAG:Ce<sup>3+</sup> PiGF is developed on opaque Al<sub>2</sub>O<sub>3</sub>/transparent Al<sub>2</sub>O<sub>3</sub> (B-Y PiGF@o/t-Al<sub>2</sub>O<sub>3</sub>) by directly incorporating high-thermal-conductivity fillers into the PiGF. The selective incorporation of h-BN establishes a local heat conduction network, significantly increasing the saturation threshold and luminous flux. Through optimization, a maximum luminous flux of 6015.46 ± 14.46 lm with a saturation threshold of 16.15 ± 0.48 W mm<sup>−2</sup> is achieved in reflective excitation mode, outperforming previous high-performance PiGFs. The addition of h-BN both enhanced heat dissipation and improved the uniformity of white light output in transmissive excitation mode, addressing the “yellow ring” effect commonly seen in laser-driven lighting. The application potential of the developed composite has been proven ranging from automotive headlights to medical lighting, offering a path toward enhanced brightness, more efficient, and operational-stable next-generation lighting technologies.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"75 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wei Xu, Wang Li, Junqi Cui, Chunhai Hu, Longjiang Zheng, Zhiguo Zhang, Zhen Sun
Nanomaterial-based luminescence thermometry enables non-invasive in vivo temperature measurement with high spatial resolution, which is crucial for driving advancement in diagnostic and therapeutic technologies. However, spectral distortions and luminescence signal attenuation resulting from complex light-tissue interactions pose substantial challenges to the practical application of this method. Here, a new strategy is presented, termed reassembled emission spectra (RaES) thermometry, for ultrarobust thermal sensing in biological environments. RaES integrates the temperature-sensitive features of sub-spectra from multiple luminescent centers, creating a thermometric parameter that is exclusively governed by temperature. To enhance accuracy further, deep learning-based denoising is preliminarily incorporated into luminescence thermometry. A U-shaped convolutional neural network model with high performance is constructed with data augmentation to recover emission spectra from significant noise with minimal bias. Empowered by the denoising model, the proposed sensing approach achieves excellent results even in challenging experiments, such as temperature measurements under static blood solution interference (ΔT = 0.23 °C) and real-time thermal monitoring during dynamic blood diffusion (ΔT = 0.37 °C), where the conventional luminescence sensing method proves completely ineffective. Being independent of specific materials and equipment, this thermometry approach offers a versatile solution adaptable to harsh environments.
{"title":"Ultrarobust and Precise Luminescence Thermometry Enabled by the Combination of Reassembled Emission Spectra With Denoising Neural Network","authors":"Wei Xu, Wang Li, Junqi Cui, Chunhai Hu, Longjiang Zheng, Zhiguo Zhang, Zhen Sun","doi":"10.1002/lpor.202401956","DOIUrl":"https://doi.org/10.1002/lpor.202401956","url":null,"abstract":"Nanomaterial-based luminescence thermometry enables non-invasive in vivo temperature measurement with high spatial resolution, which is crucial for driving advancement in diagnostic and therapeutic technologies. However, spectral distortions and luminescence signal attenuation resulting from complex light-tissue interactions pose substantial challenges to the practical application of this method. Here, a new strategy is presented, termed reassembled emission spectra (RaES) thermometry, for ultrarobust thermal sensing in biological environments. RaES integrates the temperature-sensitive features of sub-spectra from multiple luminescent centers, creating a thermometric parameter that is exclusively governed by temperature. To enhance accuracy further, deep learning-based denoising is preliminarily incorporated into luminescence thermometry. A U-shaped convolutional neural network model with high performance is constructed with data augmentation to recover emission spectra from significant noise with minimal bias. Empowered by the denoising model, the proposed sensing approach achieves excellent results even in challenging experiments, such as temperature measurements under static blood solution interference (Δ<i>T</i> = 0.23 °C) and real-time thermal monitoring during dynamic blood diffusion (Δ<i>T</i> = 0.37 °C), where the conventional luminescence sensing method proves completely ineffective. Being independent of specific materials and equipment, this thermometry approach offers a versatile solution adaptable to harsh environments.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"63 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaofeng Zhou, Chang Zhou, Yang Fu, Helin Yang, Houyuan Cheng, Ruonan Zhao, Jing Jin
This paper introduces a novel methodology for designing electromagnetic (EM) camouflage metasurfaces. Initially, a temperature-sensitive resistor is embedded within the chiral atom, allowing temperature-induced variations to selectively modulate the reflection amplitude of the left-handed circularly polarized (LCP) wave. Subsequently, the reflected phases of both the right-handed circularly polarized (RCP) and LCP waves are independently modulated, ensuring that the two phases span the full 2π range. Ultimately, the atoms are strategically arranged to facilitate the realization of various camouflage functions. As a proof of concept, a metasurface demonstrating chameleon-like camouflage and low detectability is simulated, fabricated, and experimentally validated. When the LCP wave is incident, retroreflection occurs at a specific angle. Similar to a chameleon, the radar cross section (RCS) varies in response to temperature changes. When an RCP wave is incident, an average RCS reduction greater than 12 dB is achieved in X and Ku band. Furthermore, at an incident angle of 60°, the metasurface maintains an RCS reduction exceeding 8.5 dB. Both simulation and experimental results confirm that the proposed metasurface effectively combines the advantages of chameleon-like camouflage with broadband, large-angle low detectability, demonstrating its potential for applications in electromagnetic camouflage.
{"title":"A Single-Layer Spin-Multiplexed Metasurface for Chameleon-Like Electromagnetic Camouflage and Low Detectability","authors":"Xiaofeng Zhou, Chang Zhou, Yang Fu, Helin Yang, Houyuan Cheng, Ruonan Zhao, Jing Jin","doi":"10.1002/lpor.202402051","DOIUrl":"https://doi.org/10.1002/lpor.202402051","url":null,"abstract":"This paper introduces a novel methodology for designing electromagnetic (EM) camouflage metasurfaces. Initially, a temperature-sensitive resistor is embedded within the chiral atom, allowing temperature-induced variations to selectively modulate the reflection amplitude of the left-handed circularly polarized (LCP) wave. Subsequently, the reflected phases of both the right-handed circularly polarized (RCP) and LCP waves are independently modulated, ensuring that the two phases span the full 2π range. Ultimately, the atoms are strategically arranged to facilitate the realization of various camouflage functions. As a proof of concept, a metasurface demonstrating chameleon-like camouflage and low detectability is simulated, fabricated, and experimentally validated. When the LCP wave is incident, retroreflection occurs at a specific angle. Similar to a chameleon, the radar cross section (RCS) varies in response to temperature changes. When an RCP wave is incident, an average RCS reduction greater than 12 dB is achieved in X and Ku band. Furthermore, at an incident angle of 60°, the metasurface maintains an RCS reduction exceeding 8.5 dB. Both simulation and experimental results confirm that the proposed metasurface effectively combines the advantages of chameleon-like camouflage with broadband, large-angle low detectability, demonstrating its potential for applications in electromagnetic camouflage.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"87 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143417478","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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