{"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}
{"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}
{"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}
{"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
{"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
{"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
{"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
{"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}
Hanwen Li, Weixi Liu, Zhouyi Wu, Bin Chen, Chengfeng Wen, Jiahao Wu, Ruoran Liu, Xiaolin Yi, Lijia Song, Liu Liu, Daoxin Dai, Yaocheng Shi
{"title":"Nonlinearity Manipulation for Highly Efficient Modal Phase-matched Second Harmonic Generation on Thin-Film Lithium Niobate","authors":"Hanwen Li, Weixi Liu, Zhouyi Wu, Bin Chen, Chengfeng Wen, Jiahao Wu, Ruoran Liu, Xiaolin Yi, Lijia Song, Liu Liu, Daoxin Dai, Yaocheng Shi","doi":"10.1002/lpor.202401858","DOIUrl":"https://doi.org/10.1002/lpor.202401858","url":null,"abstract":"While modal phase matching (MPM) shows great potential for adaptable engineering in quadratic nonlinear optical processes, poor mode overlap in traditional MPM persists as a key challenge. In this paper, a flexible domain engineering method are proposed and demonstrated for second-harmonic generation (SHG) on thin-film lithium niobate (TFLN). By meticulously tuning the electric field intensity applied to the poling electrodes with an Al<sub>2</sub>O<sub>3</sub> layer, the depth of domain inversion layer in TFLN can be controlled flexibly and locally, leading to the manipulation of nonlinearity, which effectively increases the mode overlap. SHG in the dual-layer TFLN ridge waveguides has been experimentally realized with a normalized conversion efficiency of 8300% W<sup>−1</sup> cm<sup>−2</sup>. The flexible and fabrication-friendly approach provides a versatile method for diverse MPM scenarios, and presents considerable potential for efficient quadratic nonlinear processes.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"58 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143030853","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}
Yi Xu, Yan Li, Ruifeng Zhong, Yu-Ru Li, Qiang Li, Dawei Wang, Zhenshi Chen, Jingshun Pan, Zhaohui Li
{"title":"Broadband and High-Resolution Mid-Infrared Spectroscopy Enabled by a Single Phase Change Metasurface","authors":"Yi Xu, Yan Li, Ruifeng Zhong, Yu-Ru Li, Qiang Li, Dawei Wang, Zhenshi Chen, Jingshun Pan, Zhaohui Li","doi":"10.1002/lpor.202401473","DOIUrl":"https://doi.org/10.1002/lpor.202401473","url":null,"abstract":"The mid-infrared (MIR) spectral region is crucial for various applications due to its unique properties, but traditional spectrometers are often bulky. Miniaturized spectrometers face a trade-off between spectral and spatial resolution. Here, a novel approach to MIR spectroscopy is numerically demonstrated by employing an electrically controlled phase-change metasurface. This method fully exploits the high optical contrast and the quasi-continuous phase change characteristics of chalcogenide phase change materials, enabling the construction of a set of spectral responses that provide broad spectral coverage with low correlation, utilizing a single metasurface pixel. With this innovative strategy, a broadband and high-resolution spectral reconstruction is numerically demonstrated with a full width at half maximum (FWHM) resolution of 20 nm and a dual-peak resolution of 160 nm within a 2400 nm bandwidth. Furthermore, the potential of the spectral detection scheme is underscored by the successful numerical reconstruction of the absorption peaks of methane and carbon dioxide, highlighting its capability for gas analysis and molecular identification. The integration of the spectral detection method into the field of spectral imaging is anticipated to have significant implications, suggesting substantial improvements in chemical process monitoring, and rapid diagnostic techniques in combustion environments.","PeriodicalId":204,"journal":{"name":"Laser & Photonics Reviews","volume":"3 1","pages":""},"PeriodicalIF":11.0,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143030810","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}