Applied optics最新文献_第3页

Circularly polarized optical imprinting for robust fabrication of geometric-phase diffraction gratings. 圆偏振光学压印技术在几何相位衍射光栅中的应用。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.590714

Kohei Noda, Masaya Fujita, Moritsugu Sakamoto, Tomoyuki Sasaki, Nobuhiro Kawatsuki, Hiroshi Ono

引用次数: 0

Hybrid wavelength-polarization-division demultiplexer based on honeycomb-lattice photonic crystal structures on a silicon platform. 基于蜂窝状晶格光子晶体结构的硅平台混合波长偏振分复用器。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.586801

Soibam Aruna Chanu, Ramesh Kumar Sonkar

{"title":"Hybrid wavelength-polarization-division demultiplexer based on honeycomb-lattice photonic crystal structures on a silicon platform.","authors":"Soibam Aruna Chanu, Ramesh Kumar Sonkar","doi":"10.1364/AO.586801","DOIUrl":"https://doi.org/10.1364/AO.586801","url":null,"abstract":"This paper presents a hybrid wavelength-division multiplexing (WDM) and polarization-division demultiplexing (PDM) device using silicon rods in the honeycomb-lattice photonic crystal structure. The device consists of a directional coupler to split the TE and TM polarizations and channel drop filters that drop the resonant channel wavelengths for both polarizations. The coupling length of the directional coupler is optimized such that only TE-polarized light is coupled to the waveguide, which is placed parallel to the input waveguide, thus separating it from the TM-polarized light. The parameters of the nanocavities in the channel drop filters are optimized to achieve resonant wavelengths in the C-band wavelength range. The period of the rods in the y direction (ayn) is discretely chirped within each cavity channel section to minimize losses and improve efficiency. The proposed WDM -PDM device has been simulated using the finite-difference time-domain (FDTD) solver, achieving a minimum insertion loss and a linewidth of 0.50 dB and 1.60 nm, respectively. The footprint of the proposed device is 37.00µm×44.63µm. The fabrication tolerance study for over-etch and under-etch conditions is performed, and the rate of the resonance wavelength shift of <2.65 is achieved.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"65 12","pages":"4069-4077"},"PeriodicalIF":0.0,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147794081","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermally tunable dual-channel ultra-high-Q absorber in a hybrid grating-photonic crystal. 混合光栅-光子晶体中热可调谐双通道超高q吸收体。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.599970

Zhuofan Jiang, Ye Ming Qing, Yue Gou, Jiale Gao, Jun Wu, Yi Shen, Shunsuke Murai, Koichi Okamoto

引用次数: 0

Quantum noise from vacuum field injection in optical cavities with diffraction-related loss. 具有衍射相关损耗的光学腔中真空场注入的量子噪声。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.580911

Kurumi Umemura, Tomohiro Ishikawa, Kenji Tsuji, Shoki Iwaguchi, Yutaro Enomoto, Yuta Michimura, Kentaro Komori, Keiko Kokeyama, Seiji Kawamura

{"title":"Quantum noise from vacuum field injection in optical cavities with diffraction-related loss.","authors":"Kurumi Umemura, Tomohiro Ishikawa, Kenji Tsuji, Shoki Iwaguchi, Yutaro Enomoto, Yuta Michimura, Kentaro Komori, Keiko Kokeyama, Seiji Kawamura","doi":"10.1364/AO.580911","DOIUrl":"https://doi.org/10.1364/AO.580911","url":null,"abstract":"The space-based gravitational wave detector DECIGO is designed to observe primordial gravitational waves with 1000 km Fabry-Perot cavities. Its sensitivity is limited by quantum noise, and although squeezing can suppress it, its effectiveness is reduced by diffraction-related loss, which leads to the injection of vacuum fields into the interferometer. This paper presents a rigorous treatment of quantum field propagation in the presence of diffraction and higher-order mode losses, deriving input-output relations and modeling their impact via an optomechanical block diagram. The analysis shows that diffraction-induced vacuum fields slightly increase radiation pressure noise, while shot noise remains unaffected. Nevertheless, cavity detuning with homodyne detection yields a dip in the noise spectrum. By accurately capturing these effects, this framework enables a detailed study of sensitivity improvements made by either just detuning the main cavity while implementing homodyne detection, or by combining this with optical-spring quantum locking using auxiliary cavities, laying a firm foundation for enhancing DECIGO's capability to detect primordial gravitational waves.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"65 12","pages":"4107-4116"},"PeriodicalIF":0.0,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147794117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Glacier segmentation algorithm that combines self-cross attention and lightweight context aggregation. 结合自交叉注意和轻量级上下文聚合的冰川分割算法。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.587286

Yunzhong Shen, Xiuzai Zhang, Changjun Yang, Qi Li, Lin Guo

引用次数: 0

Fully self-supervised physics-aware holographic depth estimation. 完全自我监督的物理感知全息深度估计。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.576759

Nabil Madali, Ibrahim Taabane

{"title":"Fully self-supervised physics-aware holographic depth estimation.","authors":"Nabil Madali, Ibrahim Taabane","doi":"10.1364/AO.576759","DOIUrl":"https://doi.org/10.1364/AO.576759","url":null,"abstract":"Autofocusing is a well-studied topic in holography, with a wide range of proposed methods, from mathematical models to more recent learning-based approaches. However, there is no consensus on a universal method that can autofocus an input hologram independently of the experimental setup. Minor changes in factors such as wavelength, pixel pitch, or hologram resolution can drastically impact the autofocus outcome. In this paper, we introduce a universal methodology that adheres to the general framework of holographic autofocusing while eliminating the need for manual hyperparameter tuning and offering robust adaptability to diverse input data. Our approach autonomously extracts optimal numerical reconstruction distances, performs volumetric rendering of the hologram, and estimates the underlying scene geometry to achieve precise autofocusing. To ensure accuracy, the generated depth estimates are constrained by matching the ground-truth values through an iterative hologram regeneration process. Our method demonstrates superior robustness and generalization on both synthetic computer-generated holograms and optically acquired on-axis phase-shifting holograms, marking a significant step toward universal autofocusing in holography.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"65 12","pages":"E1-E11"},"PeriodicalIF":0.0,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147793986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Non-pre-trained complex-valued neural network-enhanced Fourier single-pixel imaging. 非预训练复值神经网络增强傅立叶单像素成像。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.586542

Hao-Ran Shi, Yi-Fan Liu, Qi Wang

引用次数: 0

Broadband long-wave infrared dual-comb spectroscopy for multi-species detection. 宽带长波红外双梳光谱多物种探测。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.592160

Syed Tajammul Ahmad, Zhenhai Wang, Luca Moretti, Davide Gatti, Marco Marangoni, Aamir Farooq

{"title":"Broadband long-wave infrared dual-comb spectroscopy for multi-species detection.","authors":"Syed Tajammul Ahmad, Zhenhai Wang, Luca Moretti, Davide Gatti, Marco Marangoni, Aamir Farooq","doi":"10.1364/AO.592160","DOIUrl":"https://doi.org/10.1364/AO.592160","url":null,"abstract":"We demonstrate the application of a broadband long-wave infrared dual-comb spectrometer (LWIR-DCS) for gas detection across the molecular fingerprint region (7.5-11.5 µm). As a benchmark, we first validate the spectrometer through broadband single-species measurements of SO2, resolving its blended rovibrational transitions around 1111-1259cm-1 (8-9 µm) with excellent agreement to HITRAN simulations. Building on this, we demonstrate simultaneous multispecies detection of CH4, N2O, and C2H4, recovering broadband absorption spectra spanning 1000-1250cm-1 (8-10 µm) with a spectral point spacing of 8.34×10-3cm-1. Line-by-line fitting enables accurate extraction of mole fractions and pressure-broadening coefficients for the multispecies mixture, with residuals being within a few percent across the full bandwidth. Together, these results establish the LWIR-DCS as a powerful platform for both single-species and multispecies detection, with applications in environmental sensing, atmospheric chemistry, combustion diagnostics, and industrial process monitoring.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"65 12","pages":"3961-3967"},"PeriodicalIF":0.0,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147793992","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Demonstration of real-time SDM transmission using 200 and 400 Gb/s pluggable optical transceivers over weakly coupled seven-core fiber for high-speed metro and DCI applications. 使用200和400gb /s可插拔光收发器在弱耦合七芯光纤上进行高速城域和DCI应用的实时SDM传输演示。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.592537

Jian Cui, Chao Wu, Zilin Fan, Yuxiao Wang, Mingkang Lin, Cheng Chang, Yu Deng, Zhuo Liu, Bin Hao, Leimin Zhang, Yong Chen, Bin Wu, Bo Tuo, Wei Liu, Junyi Lv, Lei Shen, Lei Zhang, Jie Luo, Yan Sun, Qi Wan, Bing Yan, Ninglun Gu

{"title":"Demonstration of real-time SDM transmission using 200 and 400 Gb/s pluggable optical transceivers over weakly coupled seven-core fiber for high-speed metro and DCI applications.","authors":"Jian Cui, Chao Wu, Zilin Fan, Yuxiao Wang, Mingkang Lin, Cheng Chang, Yu Deng, Zhuo Liu, Bin Hao, Leimin Zhang, Yong Chen, Bin Wu, Bo Tuo, Wei Liu, Junyi Lv, Lei Shen, Lei Zhang, Jie Luo, Yan Sun, Qi Wan, Bing Yan, Ninglun Gu","doi":"10.1364/AO.592537","DOIUrl":"https://doi.org/10.1364/AO.592537","url":null,"abstract":"Space-division multiplexed (SDM) transmission technique based on weakly coupled multi-core fibers (MCFs) holds significant potential for next-generation large-capacity optical transmission systems, particularly in cost-sensitive fiber-constrained scenarios such as metro networks and data center interconnections (DCIs). In this paper, we demonstrate real-time SDM transmission using high-speed 200 and 400 Gb/s pluggable optical transceivers over weakly coupled seven-core MCF. The 200 and 400 Gb/s optical transceivers, which are packaged in CFP2 (C form-factor pluggable 2) and QSFP-DD (quad small form-factor pluggable double density) form factors, respectively, employ a coherent dual-polarization (DP) 16-ary quadrature amplitude modulation (16QAM) format and lightweight digital signal processing algorithms to achieve over 80 km transmission capability and the target single-channel data rate while satisfying form-factor constraints. The weakly coupled seven-core fiber exhibits extremely low inter-core crosstalk, which does not cause significant performance degradation in SDM system. Due to the coherent 200 and 400 Gb/s optical transceivers as well as the weakly coupled seven-core fiber, real-time 1.4 and 2.8 Tb/s 89 km SDM transmissions with over 7.5 and 8.5 dB power budget margins are respectively achieved. Field trial using the same pluggable optical transceivers over 70.84 km field-deployed seven-core fiber cable is also investigated and demonstrated. This work demonstrates the feasibility of achieving high-speed, cost-effective transmission using MCF and pluggable optical transceivers, and it is beneficial for next-generation high-speed metro and DCI applications.","PeriodicalId":101299,"journal":{"name":"Applied optics","volume":"65 12","pages":"4001-4009"},"PeriodicalIF":0.0,"publicationDate":"2026-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147794003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-performance integrated silicon LiDAR enabled by combined shallow and full etching. 通过结合浅蚀刻和全蚀刻实现高性能集成硅激光雷达。

Applied optics Pub Date : 2026-04-20 DOI: 10.1364/AO.592178

Qi Yun, Chengkun Yang, Qiang Wang, Zhongqi Pan, Yang Yue

引用次数: 0