Shifan Chen, Yixuan Zheng, Yifu Xu, Xiaotian Zhu, Sirui Huang, Shuai Wang, Xiaoyan Xu, Chengzhuo Xia, Zhihui Liu, Chaoran Huang, Roberto Morandotti, Sai T. Chu, Brent E. Little, Yuyang Liu, Yunping Bai, David J. Moss, Xingyuan Xu, Kun Xu
Tensor convolution is a fundamental operation in convolutional neural networks, especially for processing tensors, which are prevalent in real-world applications. Current methods often convert tensor convolutions into matrix multiplications, leading to data replication, additional memory usage and increased hardware complexity. Here, a high-bit-efficiency optical tensor convolution accelerator with reduced data redundancy and lower memory consumption is presented. The bit-efficiency of the optical tensor convolution accelerator is first explored, significantly improving its effective computing power by utilizing the spatial dimension. Consequently, the optical tensor convolutional accelerator operates at speeds exceeding 3 Tera Operations Per Second (TOPS)—the fastest single-kernel optical convolutional accelerator to date, to the best of authors' knowledge. Its performance is validated on handwritten digit recognition and histopathologic cancer detection tasks, achieving 93.8% and 77% accuracy, respectively, closely matching in-silico results. This approach simultaneously multiplexes the physical dimensions—wavelength, time, and space—and leverages the parallelism and high throughput of light, enabling efficient optical processing of tensor data with significant computational power.
{"title":"High-Bit-Efficiency TOPS Optical Tensor Convolutional Accelerator Using Microcombs","authors":"Shifan Chen, Yixuan Zheng, Yifu Xu, Xiaotian Zhu, Sirui Huang, Shuai Wang, Xiaoyan Xu, Chengzhuo Xia, Zhihui Liu, Chaoran Huang, Roberto Morandotti, Sai T. Chu, Brent E. Little, Yuyang Liu, Yunping Bai, David J. Moss, Xingyuan Xu, Kun Xu","doi":"10.1002/lpor.202401975","DOIUrl":"https://doi.org/10.1002/lpor.202401975","url":null,"abstract":"Tensor convolution is a fundamental operation in convolutional neural networks, especially for processing tensors, which are prevalent in real-world applications. Current methods often convert tensor convolutions into matrix multiplications, leading to data replication, additional memory usage and increased hardware complexity. Here, a high-bit-efficiency optical tensor convolution accelerator with reduced data redundancy and lower memory consumption is presented. The bit-efficiency of the optical tensor convolution accelerator is first explored, significantly improving its effective computing power by utilizing the spatial dimension. Consequently, the optical tensor convolutional accelerator operates at speeds exceeding 3 Tera Operations Per Second (TOPS)—the fastest single-kernel optical convolutional accelerator to date, to the best of authors' knowledge. Its performance is validated on handwritten digit recognition and histopathologic cancer detection tasks, achieving 93.8% and 77% accuracy, respectively, closely matching in-silico results. This approach simultaneously multiplexes the physical dimensions—wavelength, time, and space—and leverages the parallelism and high throughput of light, enabling efficient optical processing of tensor data with significant computational power.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"45 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143083906","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}
Miniaturized color pixels are crucial for the infrastructure of modern printing and display. In this study, plasmonic colors are generated by via polarization excitations within nanostructures composed of naturally abundant aluminum. We utilized the excitation and detection polarizations of light to achieve vibrant plasmonic colors and dramatically expand the range of the available colors by hybridize plasmonic resonances. Plasmonic full-color pixels and real-life artwork are produced using genetic algorithms based on a polarization-dependent color space. Furthermore, dynamically tuned plasmonic color pixels are demonstrated by triggering electroresponsive liquid crystals. The plasmonic color technologies are expected to facilitate color applications ranging from surface decoration, digital displays, and optical security devices to durable optical data storage.
{"title":"Dynamic Plasmonic Full-Color Generation via Machine Learning and Liquid Crystals","authors":"Kexin Li, Shuangxiu Yuan, Jialing Zhang, Yuan Tian, Jinhong Li, Bin You, Xiaolong Zhu","doi":"10.1002/lpor.202401979","DOIUrl":"https://doi.org/10.1002/lpor.202401979","url":null,"abstract":"Miniaturized color pixels are crucial for the infrastructure of modern printing and display. In this study, plasmonic colors are generated by via polarization excitations within nanostructures composed of naturally abundant aluminum. We utilized the excitation and detection polarizations of light to achieve vibrant plasmonic colors and dramatically expand the range of the available colors by hybridize plasmonic resonances. Plasmonic full-color pixels and real-life artwork are produced using genetic algorithms based on a polarization-dependent color space. Furthermore, dynamically tuned plasmonic color pixels are demonstrated by triggering electroresponsive liquid crystals. The plasmonic color technologies are expected to facilitate color applications ranging from surface decoration, digital displays, and optical security devices to durable optical data storage.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"38 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077178","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}
Xinru Huang, Hang Yang, Yi Wei, Haonan Ju, Wei Wang, Dong Tu, Guogang Li
Mechanical quenching (MQ) represents a distinctive mechano-optical response, in which the afterglow intensity is quenched under the applied mechanical stress. Compared with mechanoluminescent (ML) materials, the research on physical mechanism and sensing application of MQ materials is still insufficient. Moreover, existing mechano-optical materials typically respond only to dynamic stress, while ML materials are unable to exhibit luminescence under static stress, restricting their utility in stress-sensing applications. In this work, the MQ characteristics of CaZnOS:Cu+ are systematically studied, which displays a linear mechano-optical response to dynamic and static stress. Furthermore, this material shows a sensitive response to micro-strain in stretching tests. Therefore, a novel mechanical switch device is introduced combined with CaZnOS:Cu+ and a ML material LiTaO3:Tb3+. By comparing the alteration in luminescence intensity during stretching, different stages of stress are digitally encoded, achieving both dynamic and static stress sensing and effectively differentiating the information output. These findings provide a new approach for multi-mode dynamic and static stress sensing by utilizing mechano-optical materials and pave a significant avenue for the information integration of mechano-optical materials in the field of stress sensing.
{"title":"Dynamic and Static Stress Sensing Based on Mechanical Quenching Phenomenon From CaZnOS:Cu+","authors":"Xinru Huang, Hang Yang, Yi Wei, Haonan Ju, Wei Wang, Dong Tu, Guogang Li","doi":"10.1002/lpor.202402010","DOIUrl":"https://doi.org/10.1002/lpor.202402010","url":null,"abstract":"Mechanical quenching (MQ) represents a distinctive mechano-optical response, in which the afterglow intensity is quenched under the applied mechanical stress. Compared with mechanoluminescent (ML) materials, the research on physical mechanism and sensing application of MQ materials is still insufficient. Moreover, existing mechano-optical materials typically respond only to dynamic stress, while ML materials are unable to exhibit luminescence under static stress, restricting their utility in stress-sensing applications. In this work, the MQ characteristics of CaZnOS:Cu<sup>+</sup> are systematically studied, which displays a linear mechano-optical response to dynamic and static stress. Furthermore, this material shows a sensitive response to micro-strain in stretching tests. Therefore, a novel mechanical switch device is introduced combined with CaZnOS:Cu<sup>+</sup> and a ML material LiTaO<sub>3</sub>:Tb<sup>3+</sup>. By comparing the alteration in luminescence intensity during stretching, different stages of stress are digitally encoded, achieving both dynamic and static stress sensing and effectively differentiating the information output. These findings provide a new approach for multi-mode dynamic and static stress sensing by utilizing mechano-optical materials and pave a significant avenue for the information integration of mechano-optical materials in the field of stress sensing.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"6 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077177","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}
Frequency translation induced by the nonlinear interaction between a soliton microcomb and a linear wave has been proposed to create a comb spectrum with broad spanning. Bragg scattering triggers the coherent four‐wave‐mixing process to generate new frequency components. Utilizing the perfect soliton crystal (PSC) linear‐wave scattering allows for the reconstruction of the comb spectrum, achieving spectral broadening and increasing the number of lines. By simultaneously separating two probe lasers on each edge of the PSC comb to stimulate the idler combs, the spectrum expands outward on both sides. Additionally, the study forms a pair of interleaved combs comprising PSC and idler combs with matching comb spacing to enhance the number of lines. The shape and efficiency of the idler comb are adjusted by varying the probe laser power and detuning. In comparison to the PSC comb with a 4% conversion efficiency, the idler comb exhibits a significantly higher conversion efficiency of nearly 50%. The findings demonstrate a straightforward method to reconstruct the PSC comb by introducing a probe laser to overcome the limitations imposed by microring properties.
{"title":"Perfect Soliton Crystal Linear‐Wave Scattering Enables Spectrum Reconstruction","authors":"Hongyi Zhang, Liangjun Lu, Jianping Chen, Linjie Zhou","doi":"10.1002/lpor.202400926","DOIUrl":"https://doi.org/10.1002/lpor.202400926","url":null,"abstract":"Frequency translation induced by the nonlinear interaction between a soliton microcomb and a linear wave has been proposed to create a comb spectrum with broad spanning. Bragg scattering triggers the coherent four‐wave‐mixing process to generate new frequency components. Utilizing the perfect soliton crystal (PSC) linear‐wave scattering allows for the reconstruction of the comb spectrum, achieving spectral broadening and increasing the number of lines. By simultaneously separating two probe lasers on each edge of the PSC comb to stimulate the idler combs, the spectrum expands outward on both sides. Additionally, the study forms a pair of interleaved combs comprising PSC and idler combs with matching comb spacing to enhance the number of lines. The shape and efficiency of the idler comb are adjusted by varying the probe laser power and detuning. In comparison to the PSC comb with a 4% conversion efficiency, the idler comb exhibits a significantly higher conversion efficiency of nearly 50%. The findings demonstrate a straightforward method to reconstruct the PSC comb by introducing a probe laser to overcome the limitations imposed by microring properties.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"31 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072505","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}
Zhe Yuan, Yongchen Wang, Hangming Fan, Xiaoyang Liu, Mengfan Cheng, Qi Yang, Ming Tang, Deming Liu, Lei Deng
The increasing demand for communication capacity has led to extensive exploration of hybrid multiplexing technologies that combine multiple wavelengths, modes, and polarization. Nevertheless, designing mode converters for hybrid multiplexing remains challenging. Reconfigurable and scalable multichannel parallel mode converters offer an attractive solution for efficient mode switching with a small footprint. In this paper, a compact and high‐performance dual‐polarization multichannel parallel mode order converter based on metamaterials is proposed, which consists of two components. One of the components is the flexible and compact multimode beam splitter designed by the rapidly convergent variable step size binary search algorithm. The other component is the dual‐polarization phase shifter that maximizes the feature size of the non‐subwavelength structure, significantly reducing the adverse effects of over‐etching. The experimental results demonstrate that the insertion loss of each mode is below 1.96 dB, while the crosstalk of each input mode is lower than −13.4 dB. The feasibility of high‐speed transmission is demonstrated by transmitting 30 GBuad 16‐quadrature amplitude modulation (QAM) signals on the device. This device is believed to be the first dual‐polarization multichannel parallel mode converter reported to date. This innovative device holds great potential for enhancing communication capacity in reconfigurable and scalable hybrid multiplexed transmission systems.
{"title":"Multichannel Parallel Mode Order Converter for On‐Chip Reconfigurable PDM‐MDM Transmission","authors":"Zhe Yuan, Yongchen Wang, Hangming Fan, Xiaoyang Liu, Mengfan Cheng, Qi Yang, Ming Tang, Deming Liu, Lei Deng","doi":"10.1002/lpor.202401689","DOIUrl":"https://doi.org/10.1002/lpor.202401689","url":null,"abstract":"The increasing demand for communication capacity has led to extensive exploration of hybrid multiplexing technologies that combine multiple wavelengths, modes, and polarization. Nevertheless, designing mode converters for hybrid multiplexing remains challenging. Reconfigurable and scalable multichannel parallel mode converters offer an attractive solution for efficient mode switching with a small footprint. In this paper, a compact and high‐performance dual‐polarization multichannel parallel mode order converter based on metamaterials is proposed, which consists of two components. One of the components is the flexible and compact multimode beam splitter designed by the rapidly convergent variable step size binary search algorithm. The other component is the dual‐polarization phase shifter that maximizes the feature size of the non‐subwavelength structure, significantly reducing the adverse effects of over‐etching. The experimental results demonstrate that the insertion loss of each mode is below 1.96 dB, while the crosstalk of each input mode is lower than −13.4 dB. The feasibility of high‐speed transmission is demonstrated by transmitting 30 GBuad 16‐quadrature amplitude modulation (QAM) signals on the device. This device is believed to be the first dual‐polarization multichannel parallel mode converter reported to date. This innovative device holds great potential for enhancing communication capacity in reconfigurable and scalable hybrid multiplexed transmission systems.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"14 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143072507","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}
Seho Lee, Abdulrahman Alsaadi, Tufail Hassan, Kyungwha Chung, Seongryeong Kim, Aleksandr Barulin, Gyoujin Cho, Chong Min Koo, Inki Kim
Polymerase chain reaction (PCR) is a critical tool for nucleic acid amplification in molecular diagnosis and genetic analysis. Point‐of‐care (POC) devices are essential for controlling the spread of infectious diseases, but developing cost‐effective chip‐based PCR systems remains a challenge. This study introduces a photonic PCR chip featuring a perfect metamaterial absorber made of Ti3C2Tx MXene, silicon dioxide (SiO2), and gold nanoparticles (GNP) in a metal‐insulator‐metal (MIM) configuration. Fabricated via a solution‐processing approach, the absorber demonstrates 98% light absorption without the need for expensive lithographic methods. Utilizing a 940 nm infrared (IR) LED, the chip achieves efficient photothermal effects with heating rates of ≈8.3 °C s⁻¹ and cooling rates of ≈7.2 °C s⁻¹ during 30 cycles of λ‐DNA and SARS‐CoV‐2 amplification, transitioning from 65 °C to 95 °C. The low cost and high efficiency of the MXene‐based metamaterial absorbers highlight their potential as key components for ultrafast, energy‐efficient molecular diagnostic chips suitable for on‐site applications.
{"title":"Ultrafast Photonic PCR with All‐Solution‐Processed Ti3C2Tx‐Based Perfect Absorbers","authors":"Seho Lee, Abdulrahman Alsaadi, Tufail Hassan, Kyungwha Chung, Seongryeong Kim, Aleksandr Barulin, Gyoujin Cho, Chong Min Koo, Inki Kim","doi":"10.1002/lpor.202401600","DOIUrl":"https://doi.org/10.1002/lpor.202401600","url":null,"abstract":"Polymerase chain reaction (PCR) is a critical tool for nucleic acid amplification in molecular diagnosis and genetic analysis. Point‐of‐care (POC) devices are essential for controlling the spread of infectious diseases, but developing cost‐effective chip‐based PCR systems remains a challenge. This study introduces a photonic PCR chip featuring a perfect metamaterial absorber made of Ti<jats:sub>3</jats:sub>C<jats:sub>2</jats:sub>T<jats:sub>x</jats:sub> MXene, silicon dioxide (SiO<jats:sub>2</jats:sub>), and gold nanoparticles (GNP) in a metal‐insulator‐metal (MIM) configuration. Fabricated via a solution‐processing approach, the absorber demonstrates 98% light absorption without the need for expensive lithographic methods. Utilizing a 940 nm infrared (IR) LED, the chip achieves efficient photothermal effects with heating rates of ≈8.3 °C s⁻¹ and cooling rates of ≈7.2 °C s⁻¹ during 30 cycles of λ‐DNA and SARS‐CoV‐2 amplification, transitioning from 65 °C to 95 °C. The low cost and high efficiency of the MXene‐based metamaterial absorbers highlight their potential as key components for ultrafast, energy‐efficient molecular diagnostic chips suitable for on‐site applications.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"75 1 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071756","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}
Yingdi Pan, Lu Sun, Kaile Chen, Xingfeng Li, Xiong Ni, Pan Hu, Songyue Liu, Qi Lu, Xintao He, Jianwen Dong, Yikai Su
Coupled‐waveguide structures are fundamental in photonic integrated circuits for their wide applications in basic optical functions such as directional coupling, polarization handling, and mode manipulation. However, the couplings between waveguides usually suffer from high wavelength and structure sensitivity, which hinders the development of broadband and fabrication‐tolerant devices. Here, a new method based on the stimulated Raman adiabatic passage (STIRAP) procedure is proposed for various kinds of on‐chip mode manipulation such as mode conversion and multiplexing. The coupling process of the STIRAP system is thoroughly explored to reveal the topological nature of STIRAP. The experimental results prove that the mode‐division multiplexer employing the STIRAP scheme has low insertion losses of < 1.8 dB and intermodal crosstalk of < −17.3 dB for all four mode channels over a 100‐nm wavelength range (1480–1580 nm). Thanks to the topological protection of the mode coupling, the proposed multiplexer exhibits unprecedented fabrication tolerance (−80–100 nm) to the structural deviations in waveguide width and gap distance. This work provides an intriguing approach to expanding the working bandwidth and improving the fabrication tolerance of coupled‐waveguide devices, which may find applications in diverse fields including optical communications, optical computing, quantum information processing and beyond.
{"title":"Broadband Mode Coupling with Record‐High Fabrication Tolerance Using the Stimulated Raman Adiabatic Passage Technique","authors":"Yingdi Pan, Lu Sun, Kaile Chen, Xingfeng Li, Xiong Ni, Pan Hu, Songyue Liu, Qi Lu, Xintao He, Jianwen Dong, Yikai Su","doi":"10.1002/lpor.202401756","DOIUrl":"https://doi.org/10.1002/lpor.202401756","url":null,"abstract":"Coupled‐waveguide structures are fundamental in photonic integrated circuits for their wide applications in basic optical functions such as directional coupling, polarization handling, and mode manipulation. However, the couplings between waveguides usually suffer from high wavelength and structure sensitivity, which hinders the development of broadband and fabrication‐tolerant devices. Here, a new method based on the stimulated Raman adiabatic passage (STIRAP) procedure is proposed for various kinds of on‐chip mode manipulation such as mode conversion and multiplexing. The coupling process of the STIRAP system is thoroughly explored to reveal the topological nature of STIRAP. The experimental results prove that the mode‐division multiplexer employing the STIRAP scheme has low insertion losses of < 1.8 dB and intermodal crosstalk of < −17.3 dB for all four mode channels over a 100‐nm wavelength range (1480–1580 nm). Thanks to the topological protection of the mode coupling, the proposed multiplexer exhibits unprecedented fabrication tolerance (−80–100 nm) to the structural deviations in waveguide width and gap distance. This work provides an intriguing approach to expanding the working bandwidth and improving the fabrication tolerance of coupled‐waveguide devices, which may find applications in diverse fields including optical communications, optical computing, quantum information processing and beyond.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"146 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071830","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}
Optical microscopic imaging technology is an essential tool for exploring and understanding the microcosmic realm. Among various imaging modes, bright‐field and spiral‐phase‐contrast imaging are widely used, each capable of extracting distinct morphological information from target objects. However, conventional microscopic imaging devices and systems typically operate in a single mode or require additional modules for mode switching. Here, we present a monolithic photonic spin‐multiplexing metalens operating in the red and near‐infrared regions, which leverages a spin‐multiplexed point spread function to seamlessly switch between bright‐field and spiral‐phase‐contrast imaging modes by simply adjusting the spin state of illumination light. The device demonstrates operational efficiency of up to 80% and imaging resolution better than 4.4 µm (228 lp mm−1) in both modes. The metalens's dual‐functional imaging performance is validated with both amplitude‐type (custom‐made metallic patterns) and phase‐type (frog tongue epithelium cells and onion epidermal cells) objects. This work provides a viable solution for compact, lightweight, and easily switchable multi‐functional microscopic imaging systems, opening new avenues for applications in biomedical imaging, clinical diagnostics, and material characterization.
{"title":"Monolithic Spin‐Multiplexing Metalens for Dual‐Functional Imaging","authors":"Zhenyu Xing, Zhelin Lin, Niu Liu, Hao Gao, Yuhui Hu, Zeyang Liu, Zijian Jiang, Xinliang Zhang, Cheng Zhang","doi":"10.1002/lpor.202401993","DOIUrl":"https://doi.org/10.1002/lpor.202401993","url":null,"abstract":"Optical microscopic imaging technology is an essential tool for exploring and understanding the microcosmic realm. Among various imaging modes, bright‐field and spiral‐phase‐contrast imaging are widely used, each capable of extracting distinct morphological information from target objects. However, conventional microscopic imaging devices and systems typically operate in a single mode or require additional modules for mode switching. Here, we present a monolithic photonic spin‐multiplexing metalens operating in the red and near‐infrared regions, which leverages a spin‐multiplexed point spread function to seamlessly switch between bright‐field and spiral‐phase‐contrast imaging modes by simply adjusting the spin state of illumination light. The device demonstrates operational efficiency of up to 80% and imaging resolution better than 4.4 µm (228 lp mm<jats:sup>−1</jats:sup>) in both modes. The metalens's dual‐functional imaging performance is validated with both amplitude‐type (custom‐made metallic patterns) and phase‐type (frog tongue epithelium cells and onion epidermal cells) objects. This work provides a viable solution for compact, lightweight, and easily switchable multi‐functional microscopic imaging systems, opening new avenues for applications in biomedical imaging, clinical diagnostics, and material characterization.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"38 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071757","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}
A low‐noise microcomb with a flat and broadband spectrum is highly desired for various applications, including spectroscopy, sensing, and communications. However, both dissipative Kerr solitons (DKSs) and platicons have limitations in spectrum flatness due to their sech‐shaped profile or peaks of dispersive waves. In this study, an ultra‐flat and broadband microcomb are presented in a fiber Fabry‐Perot (F‐P) resonator. By optimizing the group velocity dispersion (GVD) and third‐order dispersion (TOD), an ultra‐flat low‐noise comb spectrum is obtained with a −1 dB bandwidth of up to 58 nm and a −30 dB bandwidth of 190 nm. Additionally, a method to control the contribution of the stimulated Raman scattering (SRS) effect by adjusting the desynchronization frequency to meet the phase‐matching condition is proposed. With the contribution from SRS, the −30 dB bandwidth is further extended to 230 nm with more than 7700 comb lines. Furthermore, a detailed investigation is conducted on the interaction among GVD, TOD, SRS, and Kerr nonlinearity, revealing the generation mechanism of such an ultra‐flat broadband comb spectrum. The work will provide valuable insights for the advancement of dispersion‐engineered resonators and further stimulate the study of the effects of SRS in fiber and integrated resonators are anticipated.
{"title":"Ultra‐Flat Broadband Low‐Noise Frequency Comb in a Fiber Fabry‐Perot Resonator","authors":"Tieying Li, Jianping Chen, Kan Wu","doi":"10.1002/lpor.202400180","DOIUrl":"https://doi.org/10.1002/lpor.202400180","url":null,"abstract":"A low‐noise microcomb with a flat and broadband spectrum is highly desired for various applications, including spectroscopy, sensing, and communications. However, both dissipative Kerr solitons (DKSs) and platicons have limitations in spectrum flatness due to their sech‐shaped profile or peaks of dispersive waves. In this study, an ultra‐flat and broadband microcomb are presented in a fiber Fabry‐Perot (F‐P) resonator. By optimizing the group velocity dispersion (GVD) and third‐order dispersion (TOD), an ultra‐flat low‐noise comb spectrum is obtained with a −1 dB bandwidth of up to 58 nm and a −30 dB bandwidth of 190 nm. Additionally, a method to control the contribution of the stimulated Raman scattering (SRS) effect by adjusting the desynchronization frequency to meet the phase‐matching condition is proposed. With the contribution from SRS, the −30 dB bandwidth is further extended to 230 nm with more than 7700 comb lines. Furthermore, a detailed investigation is conducted on the interaction among GVD, TOD, SRS, and Kerr nonlinearity, revealing the generation mechanism of such an ultra‐flat broadband comb spectrum. The work will provide valuable insights for the advancement of dispersion‐engineered resonators and further stimulate the study of the effects of SRS in fiber and integrated resonators are anticipated.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"39 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143071751","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}
The research on chip-scale spectrometers is driven by the growing demand for miniaturized and integrated spectral sensors. The performance trade-off between spectral resolution and bandwidth is one of the primary challenges for the community. While substantial progress has been made toward a vast number of spectral channels to overcome this issue, they either relied on sophisticated tuning mechanisms or required huge chip areas. In this work, a single-shot spectrometer is demonstrated based on all passive on-chip diffractive metasurfaces which is able to create the speckle pattern with richness of spectral information. By scaling the diffractive structure to three layers of metasurfaces, the number of spectral channels resolved from the speckle can be significantly increased due to the cascaded diffraction behaviors. The device is fabricated via a standard silicon photonic foundry with CMOS compatible process. A measured resolution of 47 pm is achieved across the bandwidth of 40 nm, yielding up to 851 spectral channels within a compact footprint of 150 µm × 300 µm. The corresponding spectral channel density reaches 18911 ch mm−2. It provides a possible means to develop single-shot and compact on-chip spectrometers beyond the resolution-bandwidth limit.
{"title":"Single-Shot on-Chip Diffractive Speckle Spectrometer with High Spectral Channel Density","authors":"Zimeng Zhang, Qinghai Song, Shumin Xiao, Ke Xu","doi":"10.1002/lpor.202401987","DOIUrl":"https://doi.org/10.1002/lpor.202401987","url":null,"abstract":"The research on chip-scale spectrometers is driven by the growing demand for miniaturized and integrated spectral sensors. The performance trade-off between spectral resolution and bandwidth is one of the primary challenges for the community. While substantial progress has been made toward a vast number of spectral channels to overcome this issue, they either relied on sophisticated tuning mechanisms or required huge chip areas. In this work, a single-shot spectrometer is demonstrated based on all passive on-chip diffractive metasurfaces which is able to create the speckle pattern with richness of spectral information. By scaling the diffractive structure to three layers of metasurfaces, the number of spectral channels resolved from the speckle can be significantly increased due to the cascaded diffraction behaviors. The device is fabricated via a standard silicon photonic foundry with CMOS compatible process. A measured resolution of 47 pm is achieved across the bandwidth of 40 nm, yielding up to 851 spectral channels within a compact footprint of 150 µm × 300 µm. The corresponding spectral channel density reaches 18911 ch mm<sup>−2</sup>. It provides a possible means to develop single-shot and compact on-chip spectrometers beyond the resolution-bandwidth limit.","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":"143056224","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：