Jungho Han, Yeonsoo Lim, Jeheon Lee, Seongheon Kim, Young Chul Jun
Critical coupling can induce maximized field enhancement in resonant optical modes. Therefore, it is important for various photonic technologies. Here, it is shown that directional light sources with highly enhanced emission intensities can be realized via critical coupling. A clear experimental demonstration of maximized emission enhancement is presented in quantum dot (QD)-coated Brillouin zone folding (BZF) metasurfaces. BZF dielectric metasurfaces support guided-mode resonances, where the radiative quality factor can be gradually tuned by structural parameters, allowing critical coupling to occur at the QD emission wavelength. Maximized enhancements of polarized and unpolarized emissions are demonstrated in the normal direction, resulting in highly enhanced, directional, and narrow-angled emissions. The investigations indicate that light emission from quantum emitters can be optimized via critical coupling and that BZF metasurfaces can provide a highly tunable platform for both polarization-sensitive and polarization-insensitive critical coupling. Maximized field enhancement and highly enhanced light–matter interactions in BZF metasurfaces are important for a wide range of photonic technologies such as light sources, photodetectors, sensors, nonlinear enhancement, and quantum photonic devices.
{"title":"Maximized Enhancement of Polarized and Unpolarized Emissions via Critical Coupling in Brillouin Zone Folding Metasurfaces","authors":"Jungho Han, Yeonsoo Lim, Jeheon Lee, Seongheon Kim, Young Chul Jun","doi":"10.1002/lpor.202401923","DOIUrl":"https://doi.org/10.1002/lpor.202401923","url":null,"abstract":"Critical coupling can induce maximized field enhancement in resonant optical modes. Therefore, it is important for various photonic technologies. Here, it is shown that directional light sources with highly enhanced emission intensities can be realized via critical coupling. A clear experimental demonstration of maximized emission enhancement is presented in quantum dot (QD)-coated Brillouin zone folding (BZF) metasurfaces. BZF dielectric metasurfaces support guided-mode resonances, where the radiative quality factor can be gradually tuned by structural parameters, allowing critical coupling to occur at the QD emission wavelength. Maximized enhancements of polarized and unpolarized emissions are demonstrated in the normal direction, resulting in highly enhanced, directional, and narrow-angled emissions. The investigations indicate that light emission from quantum emitters can be optimized via critical coupling and that BZF metasurfaces can provide a highly tunable platform for both polarization-sensitive and polarization-insensitive critical coupling. Maximized field enhancement and highly enhanced light–matter interactions in BZF metasurfaces are important for a wide range of photonic technologies such as light sources, photodetectors, sensors, nonlinear enhancement, and quantum photonic devices.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"74 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056265","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}
Recently, Sb3+-activated 0D Zr(IV)-based metal halides have gained enormous attention for their unique optical properties. However, realizing efficient white emission and multiple reversible emissions in a single system remains a great challenge. Parallelly, the currently reported Sb3+-activated Zr(IV)-based organic metal halides are mainly through aimless regulation of the type of A-site organic cations, severely limiting their development. Herein, all-inorganic Cs2ZrCl6:Sb3+ is employed as the conformational model, three different compounds of Sb3+-doped [18-crown-6@A]2ZrCl6 (A = K, Rb, Cs) are developed via supramolecular assembly. All compounds show efficient tunable white emission with luminous efficiency of 91.28% for [18-crown-6@K]2ZrCl6:Sb3+, 84.84% for [18-crown-6@Rb]2ZrCl6:Sb3+, and 78.63% for [18-crown-6@Cs]2ZrCl6:Sb3+, which shall stem from Sb3+-induced multi-exciton emission in [SbCl6]3− octahedron. Particularly, the strong supramolecular interaction can enhance the structural rigidity and suppress nonradiative transitions, which is the dominated reason for [18-crown-6@A]2ZrCl6:Sb3+ exhibits efficient emission. The component/excitation/temperature/moisture-dependent multiple reversible PL switching characteristics are observed in Sb3+-doped [18-crown-6@A]2ZrCl6, which allows to demonstrate their applications in advanced optical anti-counterfeiting and information encryption. Moreover, a single-component white light-emitting diode is also fabricated, which shows a high color rendering index of 96.1. Therefore, the work provides a feasible scheme for designing organic Zr(IV) halides with fascinating optical properties.
{"title":"Component/Stimulus-Dependent Multi-Exciton Emission in Zr(IV)-Based Organic Metal Halides Triggered by Supramolecular Assembly and Antimony Doping","authors":"Hui Peng, Wei Tian, Qilin Wei, Linghang Kong, Guang Dai, Jialong Zhao, Bingsuo Zou","doi":"10.1002/lpor.202401724","DOIUrl":"https://doi.org/10.1002/lpor.202401724","url":null,"abstract":"Recently, Sb<sup>3+</sup>-activated 0D Zr(IV)-based metal halides have gained enormous attention for their unique optical properties. However, realizing efficient white emission and multiple reversible emissions in a single system remains a great challenge. Parallelly, the currently reported Sb<sup>3+</sup>-activated Zr(IV)-based organic metal halides are mainly through aimless regulation of the type of A-site organic cations, severely limiting their development. Herein, all-inorganic Cs<sub>2</sub>ZrCl<sub>6</sub>:Sb<sup>3+</sup> is employed as the conformational model, three different compounds of Sb<sup>3+</sup>-doped [18-crown-6@A]<sub>2</sub>ZrCl<sub>6</sub> (A = K, Rb, Cs) are developed via supramolecular assembly. All compounds show efficient tunable white emission with luminous efficiency of 91.28% for [18-crown-6@K]<sub>2</sub>ZrCl<sub>6</sub>:Sb<sup>3+</sup>, 84.84% for [18-crown-6@Rb]<sub>2</sub>ZrCl<sub>6</sub>:Sb<sup>3+</sup>, and 78.63% for [18-crown-6@Cs]<sub>2</sub>ZrCl<sub>6</sub>:Sb<sup>3+</sup>, which shall stem from Sb<sup>3+</sup>-induced multi-exciton emission in [SbCl<sub>6</sub>]<sup>3−</sup> octahedron. Particularly, the strong supramolecular interaction can enhance the structural rigidity and suppress nonradiative transitions, which is the dominated reason for [18-crown-6@A]<sub>2</sub>ZrCl<sub>6</sub>:Sb<sup>3+</sup> exhibits efficient emission. The component/excitation/temperature/moisture-dependent multiple reversible PL switching characteristics are observed in Sb<sup>3+</sup>-doped [18-crown-6@A]<sub>2</sub>ZrCl<sub>6</sub>, which allows to demonstrate their applications in advanced optical anti-counterfeiting and information encryption. Moreover, a single-component white light-emitting diode is also fabricated, which shows a high color rendering index of 96.1. Therefore, the work provides a feasible scheme for designing organic Zr(IV) halides with fascinating optical properties.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"60 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056223","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}
Achieving ultra‐broadband absorption and enhancing the near‐infrared (NIR) emitting properties of NIR phosphors is a key challenge to realize its multiple applications, such as solar spectrum conversion, spectral analysis, and night vision. Here, a novel NIR phosphor system MTiTaO6: Cr3+ (M = Al3+, Ga3+, Sc3+), with an excitation spectrum as broad as 421 nm and enhanced NIR emission is reported. It is the widest excitation spectrum among the known Cr3+‐doped NIR phosphors. Structural and spectroscopic analysis shows that the ultra‐broadband excitation spectrum originates from the overlap of multiple luminescence centers. Additionally, the emission peak is red‐shifted from 816 to 871 nm with increasing M ion radius, and the emission intensity is enhanced, which not only makes the emission spectra more compatible with the response curve of c‐Si solar cells, but also gives it an advantage in NIR spectroscopy applications. Comparison of the excitation spectra with the solar spectrum and spectral analysis of the emission spectra of water and alcohol demonstrate its promising applications.
{"title":"MTiTaO6: Cr3+ (M = Al3+, Ga3+, Sc3+) Phosphors with Ultra‐Broadband Excitation Spectra and Enhanced Near‐Infrared Emission for Solar Cells","authors":"Lipeng Jiang, Liangliang Zhang, Xue Jiang, Jing Wang, Junji Zhang, Weiwei Jiang, Guojun Li, Hongbo Yu, Wei Si, Zhongxiang Shi, Zhihua Zhang, Yanjing Su","doi":"10.1002/lpor.202401854","DOIUrl":"https://doi.org/10.1002/lpor.202401854","url":null,"abstract":"Achieving ultra‐broadband absorption and enhancing the near‐infrared (NIR) emitting properties of NIR phosphors is a key challenge to realize its multiple applications, such as solar spectrum conversion, spectral analysis, and night vision. Here, a novel NIR phosphor system MTiTaO<jats:sub>6</jats:sub>: Cr<jats:sup>3+</jats:sup> (<jats:italic>M</jats:italic> = Al<jats:sup>3+</jats:sup>, Ga<jats:sup>3+</jats:sup>, Sc<jats:sup>3+</jats:sup>), with an excitation spectrum as broad as 421 nm and enhanced NIR emission is reported. It is the widest excitation spectrum among the known Cr<jats:sup>3+</jats:sup>‐doped NIR phosphors. Structural and spectroscopic analysis shows that the ultra‐broadband excitation spectrum originates from the overlap of multiple luminescence centers. Additionally, the emission peak is red‐shifted from 816 to 871 nm with increasing M ion radius, and the emission intensity is enhanced, which not only makes the emission spectra more compatible with the response curve of c‐Si solar cells, but also gives it an advantage in NIR spectroscopy applications. Comparison of the excitation spectra with the solar spectrum and spectral analysis of the emission spectra of water and alcohol demonstrate its promising applications.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"15 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143056313","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}
Recent remarkable progress in artificial intelligence (AI) has garnered tremendous attention from researchers, industry leaders, and the general public, who are increasingly aware of AI's growing impact on everyday life. The advancements of AI and deep learning have also significantly influenced the field of nanophotonics. On the one hand, deep learning facilitates data-driven strategies for optimizing and solving forward and inverse problems of nanophotonic devices. On the other hand, photonic devices offer promising optical platforms for implementing deep neural networks. This review explores both AI for photonic design and photonic implementation of AI. Various deep learning models and their roles in the design of photonic devices are introduced, analyzing the strengths and challenges of these data-driven methodologies from the perspective of computational cost. Additionally, the potential of optical hardware accelerators for neural networks is discussed by presenting a variety of photonic devices capable of performing linear and nonlinear operations, essential building blocks of neural networks. It is believed that the bidirectional interactions between nanophotonics and AI will drive the coevolution of these two research fields.
{"title":"Interfacing Nanophotonics with Deep Neural Networks: AI for Photonic Design and Photonic Implementation of AI","authors":"Taehyuk Park, Sujoy Mondal, Wenshan Cai","doi":"10.1002/lpor.202401520","DOIUrl":"https://doi.org/10.1002/lpor.202401520","url":null,"abstract":"Recent remarkable progress in artificial intelligence (AI) has garnered tremendous attention from researchers, industry leaders, and the general public, who are increasingly aware of AI's growing impact on everyday life. The advancements of AI and deep learning have also significantly influenced the field of nanophotonics. On the one hand, deep learning facilitates data-driven strategies for optimizing and solving forward and inverse problems of nanophotonic devices. On the other hand, photonic devices offer promising optical platforms for implementing deep neural networks. This review explores both AI for photonic design and photonic implementation of AI. Various deep learning models and their roles in the design of photonic devices are introduced, analyzing the strengths and challenges of these data-driven methodologies from the perspective of computational cost. Additionally, the potential of optical hardware accelerators for neural networks is discussed by presenting a variety of photonic devices capable of performing linear and nonlinear operations, essential building blocks of neural networks. It is believed that the bidirectional interactions between nanophotonics and AI will drive the coevolution of these two research fields.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"115 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055376","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}
Recently, whispering gallery modes (WGMs) have attracted considerable attention due to their extensive applications in the development of on-chip microcavities, high-sensitivity sensors, and high-performance lasers. Conventional WGMs are achiral under the time-reversal symmetry, and show high sensitivity to defects in optical devices. Here, topological physics is introduced into photonic cavities and the realization of chiral WGMs is demonstrated enabled by photonic Chern insulators. Through comprehensive numerical simulations and experimental measurements, the critical differences between chiral and achiral WGMs are revealed, highlighting the robustness of chiral WGMs even in the presence of defects within the cavities. This research provides valuable insights into the design of robust WGM cavities and offers a novel platform for exploring light–matter interaction phenomena.
{"title":"Realization of Chiral Whispering Gallery Mode Cavities Enabled by Photonic Chern Insulators","authors":"Hao-Chang Mo, Zi-Xuan Gao, Xiao-Dong Chen, Jian-Wen Dong","doi":"10.1002/lpor.202401450","DOIUrl":"https://doi.org/10.1002/lpor.202401450","url":null,"abstract":"Recently, whispering gallery modes (WGMs) have attracted considerable attention due to their extensive applications in the development of on-chip microcavities, high-sensitivity sensors, and high-performance lasers. Conventional WGMs are achiral under the time-reversal symmetry, and show high sensitivity to defects in optical devices. Here, topological physics is introduced into photonic cavities and the realization of chiral WGMs is demonstrated enabled by photonic Chern insulators. Through comprehensive numerical simulations and experimental measurements, the critical differences between chiral and achiral WGMs are revealed, highlighting the robustness of chiral WGMs even in the presence of defects within the cavities. This research provides valuable insights into the design of robust WGM cavities and offers a novel platform for exploring light–matter interaction phenomena.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"15 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143055375","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}
Epsilon-near-zero (ENZ) materials exhibit unique electromagnetic properties that enable efficient wave transmission through channels of arbitrary geometry, which is known as ENZ supercoupling or tunneling. However, the supercoupling effect is typically confined to an inherent narrow bandwidth, which significantly restrict its practical applications. In this paper, a feasible method is proposed that enhanced the bandwidth of ENZ supercoupling. By optimizing the structure of an inverse-designed pixel metamaterial inserted into the ENZ channel, multiple Fabry-Perot (FP) modes are properly regulated and coupled, facilitating multimode superposition to enhance the bandwidth for high-efficiency signal transmission in ENZ channels with arbitrary geometry. Furthermore, a prototype is constructed at microwave frequency to validate the performance of the proposed method, which opens new avenues for the development of broadband and geometry-independent electromagnetic devices with the benefit of ENZ materials.
{"title":"Bandwidth Enhancement of Epsilon-Near-Zero Supercoupling with Inverse-Designed Metamaterials","authors":"Pengyu Fu, Peihang Li, Yue Li","doi":"10.1002/lpor.202402014","DOIUrl":"https://doi.org/10.1002/lpor.202402014","url":null,"abstract":"Epsilon-near-zero (ENZ) materials exhibit unique electromagnetic properties that enable efficient wave transmission through channels of arbitrary geometry, which is known as ENZ supercoupling or tunneling. However, the supercoupling effect is typically confined to an inherent narrow bandwidth, which significantly restrict its practical applications. In this paper, a feasible method is proposed that enhanced the bandwidth of ENZ supercoupling. By optimizing the structure of an inverse-designed pixel metamaterial inserted into the ENZ channel, multiple Fabry-Perot (FP) modes are properly regulated and coupled, facilitating multimode superposition to enhance the bandwidth for high-efficiency signal transmission in ENZ channels with arbitrary geometry. Furthermore, a prototype is constructed at microwave frequency to validate the performance of the proposed method, which opens new avenues for the development of broadband and geometry-independent electromagnetic devices with the benefit of ENZ materials.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"35 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050843","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}
Xingwei Han, Chao Han, Meiyu He, Jiayue Han, He Yu, Jun Gou, Jun Wang
In recent years, infrared visualization technology has attracted significant attention, and organic upconversion devices (OUDs) have become a reliable infrared imaging strategy due to the superiority of low cost, simple structure, and large-area imaging. Nonetheless, the power consumption of OUDs is mostly high, so effectively reducing the turn-on voltage (Von) has emerged as a crucial aspect in optimizing OUD performance, alongside the urgent need to enhance imaging resolution. This work presents an efficient OUD integrating a homotandem photodetector and an organic light-emitting diode to reduce the Von of the OUD since the homotandem detection unit can generate nearly twice the open-circuit voltage (Voc) compared to the single detection unit. The device reaches a noteworthy Von of 0.64 V, which is the lowest Von reported for OUDs, accompanied by a high upconversion efficiency of 10.64% and a wide luminance linear dynamic range (L-LDR) of 82.94 dB. In addition, high-quality bioimaging with wide operating voltages is demonstrated, achieving imaging resolution up to 5799 pixels per inch (ppi). This work demonstrates an effective technical approach to reduce the power consumption of OUDs and facilitate future bioimaging applications.
{"title":"Ultralow Turn-On Voltage Organic Upconversion Devices for High-Resolution Imaging Based on Near-Infrared Homotandem Photodetector","authors":"Xingwei Han, Chao Han, Meiyu He, Jiayue Han, He Yu, Jun Gou, Jun Wang","doi":"10.1002/lpor.202401375","DOIUrl":"https://doi.org/10.1002/lpor.202401375","url":null,"abstract":"In recent years, infrared visualization technology has attracted significant attention, and organic upconversion devices (OUDs) have become a reliable infrared imaging strategy due to the superiority of low cost, simple structure, and large-area imaging. Nonetheless, the power consumption of OUDs is mostly high, so effectively reducing the turn-on voltage (V<sub>on</sub>) has emerged as a crucial aspect in optimizing OUD performance, alongside the urgent need to enhance imaging resolution. This work presents an efficient OUD integrating a homotandem photodetector and an organic light-emitting diode to reduce the V<sub>on</sub> of the OUD since the homotandem detection unit can generate nearly twice the open-circuit voltage (V<sub>oc</sub>) compared to the single detection unit. The device reaches a noteworthy V<sub>on</sub> of 0.64 V, which is the lowest V<sub>on</sub> reported for OUDs, accompanied by a high upconversion efficiency of 10.64% and a wide luminance linear dynamic range (L-LDR) of 82.94 dB. In addition, high-quality bioimaging with wide operating voltages is demonstrated, achieving imaging resolution up to 5799 pixels per inch (ppi). This work demonstrates an effective technical approach to reduce the power consumption of OUDs and facilitate future bioimaging applications.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"10 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050841","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}
Yoon-Soo Jang, Heulbi Ahn, Sunghoon Eom, Jungjae Park, Jonghan Jin
Over the last two decades, frequency combs have brought breakthroughs in length metrology with traceability to length standards. In particular, frequency-comb-based spectral interferometry is regarded as a promising technology for next-generation length standards. However, to achieve this, the nanometer-level precision inherent in a laser interferometer is required. Here, distance measurements are reported by frequency-comb-based spectral interferometry with sub-nm precision close to a standard quantum limit. The measurement precision is confirmed as 0.67 nm at an average time of 25 µs. The measurement sensitivity is found to be 4.5·10−12m/Hz1/2, close to the quantum-limit. As a practical example of observing precise physical phenomena, remote sound sensing is demonstrated through measuring vibrations induced by acoustic waves. The study will be an important step toward the practical realization of upcoming length standards.
{"title":"Approaching the Quantum-Limited Precision in Frequency-Comb-Based Spectral Interferometric Ranging","authors":"Yoon-Soo Jang, Heulbi Ahn, Sunghoon Eom, Jungjae Park, Jonghan Jin","doi":"10.1002/lpor.202401995","DOIUrl":"https://doi.org/10.1002/lpor.202401995","url":null,"abstract":"Over the last two decades, frequency combs have brought breakthroughs in length metrology with traceability to length standards. In particular, frequency-comb-based spectral interferometry is regarded as a promising technology for next-generation length standards. However, to achieve this, the nanometer-level precision inherent in a laser interferometer is required. Here, distance measurements are reported by frequency-comb-based spectral interferometry with sub-nm precision close to a standard quantum limit. The measurement precision is confirmed as 0.67 nm at an average time of 25 µs. The measurement sensitivity is found to be 4.5·10<sup>−12</sup>m/Hz<sup>1/2</sup>, close to the quantum-limit. As a practical example of observing precise physical phenomena, remote sound sensing is demonstrated through measuring vibrations induced by acoustic waves. The study will be an important step toward the practical realization of upcoming length standards.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"50 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050842","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}
Rong Yan, Hammad Ahmed, Muhammad Afnan Ansari, Guanchao Wang, Chunmei Zhang, Li Li, Hao Tian, Liheng Bian, Xianzhong Chen
Each photon in a vortex beam carries an orbital angular momentum (OAM). OAM detection plays a very important role in unlocking the new capability of vortex beams in both fundamental research and technological advancements. As the number of information channels continues to grow, there is an urgent need to improve the detection capability of the OAM sorting system. The unprecedented capability of optical metasurfaces has provided an opportunity to realize OAM detection in a compact platform. Different OAM modes are typically separated into distinct light spots in OAM sorting. However, each spot in an OAM sorting system is tailored to recognize only one predesigned OAM mode. A metasurface approach to detecting more OAM modes with the same number of light spots in the observation plane is demonstrated. The conservation of momentum in the design is realized with a customized multifoci metalens. The efficacy of this method is exemplified through the detection of two OAM modes in an individual light spot, dramatically increasing the detection capability of the OAM sorter. It is anticipated that this design will reduce the demand for spatial resources, creating new opportunities to explore OAM applications across many research fields such as optical communications and quantum science.
{"title":"Enhancing Detection Capability of Orbital Angular Momentum Sorter","authors":"Rong Yan, Hammad Ahmed, Muhammad Afnan Ansari, Guanchao Wang, Chunmei Zhang, Li Li, Hao Tian, Liheng Bian, Xianzhong Chen","doi":"10.1002/lpor.202401759","DOIUrl":"https://doi.org/10.1002/lpor.202401759","url":null,"abstract":"Each photon in a vortex beam carries an orbital angular momentum (OAM). OAM detection plays a very important role in unlocking the new capability of vortex beams in both fundamental research and technological advancements. As the number of information channels continues to grow, there is an urgent need to improve the detection capability of the OAM sorting system. The unprecedented capability of optical metasurfaces has provided an opportunity to realize OAM detection in a compact platform. Different OAM modes are typically separated into distinct light spots in OAM sorting. However, each spot in an OAM sorting system is tailored to recognize only one predesigned OAM mode. A metasurface approach to detecting more OAM modes with the same number of light spots in the observation plane is demonstrated. The conservation of momentum in the design is realized with a customized multifoci metalens. The efficacy of this method is exemplified through the detection of two OAM modes in an individual light spot, dramatically increasing the detection capability of the OAM sorter. It is anticipated that this design will reduce the demand for spatial resources, creating new opportunities to explore OAM applications across many research fields such as optical communications and quantum science.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"28 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143050844","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}
Pietro Ricci, Mateu Colom, Blanca Mestre-Torà, Martí Duocastella
The rapid and precise delivery of light at targeted positions on a sample is essential for any light-based application, including laser materials processing or imaging. However, current systems for light control rely on bulky and costly optical components placed outside the sample. This configuration can be limited by the sample's geometry, poor flexibility in the illumination, and shallow penetration depth, particularly for scattering samples. Here a novel approach is proposed for guiding light within optically transparent and scattering media while obviating any external components. By simply employing an absorptive material and a pulsed laser, this method leverages the photoacoustic generation of a localized pressure wave to induce refractive index gradients within a medium. These gradients act as non-invasive optical waveguides, that allow for light focusing and guiding across several millimeters at sub-microsecond time scales. The principle and implementation of this method are described, the light-guiding effects through various tissue phantoms are simulated and measured, and micrometric laser marking of a photo-absorbing layer is demonstrated inside a 7-mm-thick scattering phantom. The possibility to operate with endogenous absorbing materials and low pressures makes photoacoustic-enabled light guiding a promising step toward rapid light delivery at conditions not feasible today.
{"title":"Photoacoustics for Direct Light-Guiding Inside Transparent and Scattering Media","authors":"Pietro Ricci, Mateu Colom, Blanca Mestre-Torà, Martí Duocastella","doi":"10.1002/lpor.202401122","DOIUrl":"https://doi.org/10.1002/lpor.202401122","url":null,"abstract":"The rapid and precise delivery of light at targeted positions on a sample is essential for any light-based application, including laser materials processing or imaging. However, current systems for light control rely on bulky and costly optical components placed outside the sample. This configuration can be limited by the sample's geometry, poor flexibility in the illumination, and shallow penetration depth, particularly for scattering samples. Here a novel approach is proposed for guiding light within optically transparent and scattering media while obviating any external components. By simply employing an absorptive material and a pulsed laser, this method leverages the photoacoustic generation of a localized pressure wave to induce refractive index gradients within a medium. These gradients act as non-invasive optical waveguides, that allow for light focusing and guiding across several millimeters at sub-microsecond time scales. The principle and implementation of this method are described, the light-guiding effects through various tissue phantoms are simulated and measured, and micrometric laser marking of a photo-absorbing layer is demonstrated inside a 7-mm-thick scattering phantom. The possibility to operate with endogenous absorbing materials and low pressures makes photoacoustic-enabled light guiding a promising step toward rapid light delivery at conditions not feasible today.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"45 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143044194","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：