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Massive GaN micro-LED array based underwater wireless optical communication

OPTICS EXPRESS 2025年第9期33卷 19527-19534页

作者： Lv, Zhijian Liu, Xinyi Wu, Shuang Zhang, Wenwei Yue, C. Patrick Liu, Zhaojun Shenzhen Technol Univ Sino German Coll Intelligent Mfg Shenzhen Peoples R China Southern Univ Sci & Technol Dept Elect & Elect Engn Shenzhen Peoples R China Hong Kong Univ Sci & Technol State Key Lab Adv Displays & Optoelect Technol Hong Kong Peoples R China Hong Kong Univ Sci & Technol Integrated Circuit Design Ctr Dept Elect & Comp Engn Hong Kong Peoples R China

High-speed underwater wireless optical communication technology is a much-needed communication technology in current underwater applications, and micro-LED is a promising light source option. Considering the limitation of transmission distance due to the low optical power of a single micro-LED pixel, an underwater wireless optical communication system based on a novel massive GaN micro-LED array includes more than 5000 pixels fabricated via flip-chip technology is proposed, which can achieve 165-Mbps and 90-Mbps at 37.7 m and 73.5 m, respectively. Therefore, the feasibility of realizing a high data rate and long transmission distance in an underwater wireless optical communication system based on a novel massive micro-LED array is confirmed. (c) 2025 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

关键词： Attenuation coefficient Light sources optical signals optical systems optical wireless communication Single pixel imaging

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Recent advances in photoelectrochemical hydrogen production using I-III-vi quantum dots

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NANOSCALE 2024年第19期16卷 9295-9310页

作者： Lee, Hyo Cheol Park, Ji Hye In, Su-Il Yang, Jiwoong Daegu Gyeongbuk Inst Sci & Technol DGIST Dept Energy Sci & Engn Daegu 42988 South Korea Daegu Gyeongbuk Inst Sci & Technol DGIST Energy Sci & Engn Res Ctr Daegu 42988 South Korea

Photoelectrochemical (PEC) water splitting, recognized for its potential in producing solar hydrogen through clean and sustainable methods, has gained considerable interest, particularly with the utilization of semiconductor nanocrystal quantum dots (QDs). This minireview focuses on recent advances in PEC hydrogen production using I-III-vi semiconductor QDs. The outstanding optical and electrical properties of I-III-vi QDs, which can be readily tuned by modifying their size, composition, and shape, along with an inherent non-toxic nature, make them highly promising for PEC applications. The performance of PEC devices using these QDs can be enhanced by various strategies, including ligand modification, defect engineering, doping, alloying, and core/shell heterostructure engineering. These approaches have notably improved the photocurrent densities for hydrogen production, achieving levels comparable to those of conventional heavy-metal-based counterparts. Finally, this review concludes by addressing the present challenges and future prospects of these QDs, underlining crucial steps for their practical applications in solar hydrogen production. This minireview covers recent advances in photoelectrochemical hydrogen production using I-III-vi QDs, detailing the material design strategies.

关键词： Semiconductor quantum dots

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Progress in 3D Display Technologies for Immersive visual Experiences

IEEE Open Journal on Immersive Displays

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IEEE Open Journal on Immersive Displays 2024年 1卷 155-164页

作者： Jo, Jeong-Wan Kim, Yoonwoo Jung, Sung-Min Kim, Jong Min University of Cambridge Electrical Engineering Division Department of Engineering CambridgeCB3 0FA United Kingdom

The increasing demand for immersive visual experiences has significantly driven the expansion of augmented and virtual reality. The optical technologies that support the three-dimensional displays are pivotal in advancing immersive display systems. This article reviews the fundamental concepts and current progress in the development of various 3D display technologies, with a focus on immersive 3D display systems. We discuss the basic concept of depth perception through monocular and binocular cues in the human visual system. Various stereoscopic display systems that utilise eyewear glasses are introduced. The fundamental operation principles and design rules of multi-view autostereoscopic display systems are investigated, with a highlight on active optical filter technology for converting between 2D and 3D display modes. Additionally, light field display technologies, which offer more natural depth perception, are explored. State-of-the-art technologies, recent research trends, and applications to immersive AR and VR systems across stereoscopic, autostereoscopic, and light field displays are examined. Combinatorial innovations in optical materials, optical device architecture, cost-effective process technologies, and precise system design will accelerate the commercialization of immersive displays including AR and VR applications, offering an excellent user experience and leading the future of the immersive display industry. © 2024 IEEE.

关键词： Depth perception

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MCOCT: an experimentally and numerically validated, open-source Monte Carlo simulator for optical coherence tomography

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BIOMEDICAL OPTICS EXPRESS 2024年第2期15卷 624-640页

作者： Erdenedalai, Khaliun Maltais-Tariant, Raphael Dehaes, Mathieu Boudoux, Caroline Polytech Montreal Dept Engn Phys Montreal PQ H3T 1J4 Canada Univ Montreal Dept Radiol Radiooncol & Nucl Med Montreal PQ H3T 1J4 Canada St Justine Univ Hosp Ctr Res Ctr Montreal PQ H3T 1C5 Canada Univ Montreal Inst Biomed Engn Montreal PQ H3T 1J4 Canada Castor Opt Montreal PQ H3T 2B1 Canada

Here, we present MCOCT, a Monte Carlo simulator for optical coherence tomography (OCT), incorporating a Gaussian illumination scheme and bias to increase backscattered event collection. MCOCT optical fluence was numerically compared and validated to an established simulator (MCX) and showed concordance at the focus while diverging slightly with distance to it. MCOCT OCT signals were experimentally compared and validated to OCT signals acquired in tissue -mimicking phantoms with known optical properties and showed a similar attenuation pattern with increasing depth while diverging beyond 1.5 mm and proximal to layer interfaces. MCOCT may help in the design of OCT systems for a wide range of applications.

关键词： Biomedical imaging Imaging systems Imaging techniques optical properties Tissue optics Turbid media

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Passive on-chip isolators based on the thin-film lithium niobate platform

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Chinese Physics B 2025年第3期34卷 408-413页

作者： Jiacheng Liu Gongyu Xia Qilin Hong Pingyu Zhu Kai-Kai Zhang Keyu Xia Ping Xu Shiqiao Qin Zhihong Zhu College of Advanced Interdisciplinary Studies&Hunan Provincial Key Laboratory of Novel Nano Optoelectronic Information Materials and Devices National University of Defense TechnologyChangsha 410073China Institute for Quantum Information and State Key Laboratory of High-Performance Computing College of Computer Science and TechnologyNational University of Defense TechnologyChangsha 410073China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructuresand Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210023China

optical isolators,the photonic analogs of electronic diodes,are essential for ensuring the unidirectional flow of light in optical systems,thereby mitigating the destabilizing effects of back ***-film lithium niobate(TFLN),hailed as“the silicon of photonics,”has emerged as a pivotal material in the realm of chip-scale nonlinear optics,propelling the demand for compact optical *** report a breakthrough in the development of a fully passive,integrated optical isolator on the TFLN platform,leveraging the Kerr effect to achieve an impressive 10.3 dB of isolation with a minimal insertion loss of 1.87 *** theoretical simulations have demonstrated that our design,when applied to a microring resonator with a Q factor of 5×10^(6),can achieve 20 dB of isolation with an input power of merely 8 *** advancement underscores the immense potential of lithium niobate-based Kerr-effect isolators in propelling the integration and application of high-performance on-chip lasers,heralding a new era in integrated photonics.

关键词： thin-film lithium niobate Kerr effect optical isolator

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Far-field sub-diffraction focusing and controlled focus shaping of circularly polarized light using a dielectric phase plate

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JOURNAL OF THE optical SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND viSION 2024年第10期41卷 1899-1904页

作者： Pant, Bhavesh Singh, Brijesh Kumar Cent Univ Rajasthan Sch Phys Sci Dept Phys Ajmer 305817 Rajasthan India

In recent years, sub-diffraction focusing has received substantial attention due to its versatility. However, achieving a flexible sub-diffraction focusing in the far field remains stimulating. Existing techniques either require complex fabrication facilities or are limited to the short focal length and high numerical aperture (NA) of the imaging system. Here, we introduce an optimization method for sub-diffraction focusing of a circularly polarized beam in the far field with a lens of large focal length. A cost-effective dielectric phase plate serves the purpose. By employing a phase plate composed of a thin layer of dielectric Si3N4, the phase of the propagating beam is modulated in the beam's cross-section, which is divided into two regions of the opposite phase by the plate. A sub-diffraction focusing is achieved for a proper tunning between the two regions. In addition to sub-diffraction focusing, the phase plate is also capable of shaping the focus into a doughnut-shaped and a flat-top profile in the far field. This design provides a simple solution for sub-diffraction focusing and focus shaping that will find potential applications in optical imaging, optical trapping, and material processing. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Diffractive optical elements Imaging systems Materials processing Near field scanning optical microscopy optical systems Phase plates

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Suppression of the Petermann noise factor in a chiral optical mode converter without encircling an exceptional point

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JOURNAL OF THE optical SOCIETY OF AMERICA B-optical PHYSICS 2024年第11期41卷 2534-2539页

作者： Ghosh, Shamba Roy, Arpan Dey, Sibnath Pal, Bishnu P. Ghosh, Somnath Indian Inst Technol Jodhpur Dept Phys Karwar 342030 Rajasthan India Univ Calcutta Inst Radio Phys & Elect Kolkata 700009 India Tata Inst Fundamental Res Hyderabad India Mahindra Univ Ecole Cent Sch Engn Dept Phys Hyderabad 500043 Telangana India

The engineering of exceptional points (EP) in gain-loss-assisted optical systems has recently garnered considerable attention for the development of unconventional photonic components. Moreover, the substantial noise associated with EPs poses a significant challenge to realizing their full potential in applications. There is a gap in the exploration of asymmetric mode conversion phenomena in the close proximity of the dynamical encirclement around an EP. In response, we propose the design of a fabrication-feasible dual-mode optical planar waveguide. Non-Hermiticity, in terms of a customized gain-loss profile, is introduced to modulate the interaction between the coupled modes. Contrary to previous assumptions, we establish that the dynamical encirclement of an EP is not a prerequisite for achieving asymmetric mode conversion. Furthermore, we calculate the Petermann factor (K) near the EP and demonstrate a significant two orders of magnitude reduction in the Petermann noise factor when we do not dynamically encircle the EP. Hence, we propose a new scheme to reduce the inherent noise. (c) 2024 Optica Publishing Group. All rights, including for text and data mining (TDM), Artificial Intelligence (AI) training, and similar technologies, are reserved.

关键词： Laser operation Mode conversion optical systems Photonic crystals Photonic devices Planar waveguides

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High refractive index and low birefringence polymers for XR applications 6

High refractive index and low birefringence polymers for XR ...

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6th Conference on optical Architectures for Displays and Sensing in Augmented, virtual, and Mixed Reality-AR, VR, MR

作者： Inoue, Kris Suga, Tatsuya Kato, Noriyuki Mitsubishi Gas Chem Co Inc Mitsubishi Bldg 5-2Marunouchi 2-chome Chiyoda Ku Tokyo 1008324 Japan

ISBN: (纸本)9781510686069;9781510686076

XR devices require advanced optical lenses to achieve the trends like miniaturization, weight reduction and higher performance (high resolution and wide field of view). To achieve these goals, high-performance optical materials are required. Iupizeta EP is a specialty polycarbonate resin specifically developed for optical lens applications, offering high refractive index, high transmittance, and low birefringence. Iupizeta EP has gained a significant market share in the field of smartphone camera lenses. Through our expertise in controlling optical properties with distinct techniques of molecular design, Mitsubishi Gas Chemical have developed new optical materials for XR lens systems. This optical material maintains existing performance while offering superior moldability and ultra-low birefringence. This innovation allows for high dimensional accuracy and low birefringence even in thick or complex shapes, significantly enhancing flexibility in product development. This material is expected to refine the next-generation XR devices and significantly change the conventional concept of XR devices.

关键词： Polymers Cameras virtual reality optical design Injection molding Refractive index Transmittance Birefringence

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Inverse-designed Lithium Niobate Nanophotonics

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ACS PHOTONICS 2023年第4期10卷 1019-1026页

作者： Shang, Chengfei Yang, Jingwei Hammond, Alec M. Chen, Zhaoxi Chen, Mo Lin, Zin Johnson, Steven G. Wang, Cheng MIT Dept Math Cambridge MA 02139 USA Georgia Inst Technol Sch Elect & Comp Engn Atlanta GA 30308 USA MIT Dept Math Cambridge MA 02139 USA

Lithium niobate-on-insulator (LNOI) is an emerging photonic platform that exhibits favorable material properties (such as low optical loss, strong nonlinearities, and stability) and enables large-scale integration with stronger optical confinement, showing promise for future optical networks, quantum processors, and nonlinear optical systems. However, while photonics engineering has entered the era of automated "inverse design" via optimization in recent years, the design of LNOI integrated photonic devices still mostly relies on intuitive models and inefficient parameter sweeps, limiting the accessible parameter space, performance, and functionality. Here, we implement a 3D gradient-based inverse-design model tailored for topology optimization based on the LNOI platform, which not only could efficiently search a large parameter space, but also takes into account practical fabrication constraints, including minimum feature sizes and etched sidewall angles. We experimentally demonstrate a spatial-mode multiplexer, a waveguide crossing, and a compact waveguide bend, all with low insertion losses, tiny footprints, and excellent agreement between simulation and experimental results. The devices, together with the design methodology, represent a crucial step toward the variety of advanced device functionalities needed in future LNOI photonics and could provide compact and cost-effective solutions for future optical links, quantum technologies, and nonlinear optics.

关键词： inverse design topology optimization lithium niobate integrate photonics

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End-to-end infrared imaging system design with diffractive optical element 14

End-to-end infrared imaging system design with diffractive o...

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optical design and Testing XIV 2024

作者： Shi, Runzhou Zhou, Yan Zhang, Tian Shao, Yuqi Zhang, Hanwen Wei, Ruoyan Bai, Jian College of Optical Science and Engineering Zhejiang University Hangzhou310027 China ZJU-Hangzhou Global Scientific and Technological Innovation Center Zhejiang University Hangzhou311215 China State Key Laboratory of Extreme Photonics and Instrumentation Zhejiang University Hangzhou310027 China Tianjin Jinhang Institute of Technical Physics Tianjin300308 China

ISBN: (纸本)9781510682023

The hybrid refractive-diffractive optics system exhibits strong capabilities in achromatic and non-thermalized design, as well as information encoding. This paper introduces an innovative end-to-end design scheme for refractive-diffractive hybrid imaging optical systems, which optimizes both optical and neural network parameters simultaneously. An all-ray differentiable ray-tracing model is proposed to integrate lens and diffractive optical elements into a unified design framework, thereby maintaining precision by avoiding wave-to-ray conversion losses. The neural network is constructed based on the imaging characteristics of infrared hybrid optical systems and enhances aberration correction. The proposed method is applied to the design of a single-lens short-wave infrared imaging system, outperforming traditional discrete designs and demonstrating significant potential for infrared optical system applications. © 2024 SPIE.

关键词： Ray tracing

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