Optics letters最新文献

All-diamond transparent solar-blind UV photodetector with thin boron-doped diamond film as electrodes. 以掺硼金刚石薄膜为电极的全金刚石透明日盲紫外探测器。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.596496

Yuanyang Gao, Zhengjie Tang, Zhangcheng Liu, Fengqiu Jiang, Pengfei Zhang, Yang Li, Zhiwei Chen, Tao Liu, Xiao Wang, Jinping Ao

引用次数: 0

Optical response of graphene quantum dots in the visible spectrum: a combined DFT-QED approach. 可见光谱中石墨烯量子点的光学响应：一种联合DFT-QED方法。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.581217

Julieta Olivo, Jorge Blengino Albrieu, Mauro Cuevas

引用次数: 0

Decoupled flat-band and high-Q engineering in photonic crystal slabs. 光子晶体板中的去耦平带和高q工程。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.591482

Jiaoyang Guo, Xiaofang Wang, Rong Jin, Zhenchu Fu, Yukang Zhang, Feilong Yu, Jin Chen, Xingjun Wang, Xiaoshuang Chen, Wei Lu, Guanhai Li

引用次数: 0

Highly efficient, depressed-cladding thulium-doped fiber laser at 1762 nm. 1762 nm的高效掺铥光纤激光器。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.590030

Maria Michalska, Jan Aubrecht, Jan Pokorný, Michal Kamrádek, Michal Kozuchowski, Pavel Honzatko, Jacek Swiderski

引用次数: 0

Adaptive entropy loading via direct activation for an optical frequency comb-based few-mode transmission system. 基于光频梳的少模传输系统的直接激活自适应熵加载。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.597153

Ziyue Zhang, Yuanfei Zhang, Chester Shu

{"title":"Adaptive entropy loading via direct activation for an optical frequency comb-based few-mode transmission system.","authors":"Ziyue Zhang, Yuanfei Zhang, Chester Shu","doi":"10.1364/OL.597153","DOIUrl":"https://doi.org/10.1364/OL.597153","url":null,"abstract":"We demonstrate a multi-dimensional entropy loading mechanism in an optical frequency comb-based few-mode transmission system. The frequency comb functions as a compact and energy-efficient multi-carrier laser source; however, performance discrepancies arise across wavelength channels and spatial modes due to power variation among comb lines, intermodal crosstalk, and environmental fluctuations. To address these impairments, we employ a neuronal direct activation structure that enables multi-dimensional entropy loading for adaptive reallocation of the source entropy. Our unique solution is a model-free, neuromorphic-inspired mapping framework that utilizes tanh activation and max-pooling to achieve instantaneous entropy reallocation. This approach provides iterative-free dynamic entropy adjustment, ensuring efficient channel utilization and instantaneous adaptability to varying network conditions. Experimental results verify that the proposed scheme effectively mitigates non-uniform channel performance, achieving a 4.82% capacity enhancement, corresponding to a data rate increase of 31.7 Gbit/s. Our approach extends the entropy loading to multi-dimensional coherent systems, offering a highly scalable and robust solution for next-generation data center interconnects.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 9","pages":"2608-2611"},"PeriodicalIF":3.3,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818023","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

On the link between Fourier transformation and passive amplification in temporal Talbot array illuminators. 时域塔尔博特阵列照明器中傅里叶变换与无源放大的关系。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.591320

Majid Goodarzi, Geunweon Lim, José Azaña

引用次数: 0

Compact mode dimension sorter enabled by an on-chip graded-index metamaterial lens. 紧凑模式尺寸分选器由片上分级折射率超材料透镜实现。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.595743

Weixin Wang, Zhiyong Wu, Zhengji Xu

{"title":"Compact mode dimension sorter enabled by an on-chip graded-index metamaterial lens.","authors":"Weixin Wang, Zhiyong Wu, Zhengji Xu","doi":"10.1364/OL.595743","DOIUrl":"https://doi.org/10.1364/OL.595743","url":null,"abstract":"Precise manipulation of on-chip optical modes using subwavelength structures is critical for miniaturizing devices and scaling high-speed optical interconnects, especially in Mode Division Multiplexing (MDM) systems. Leveraging advances in nanofabrication, devices engineered with subwavelength features enable versatile control over on-chip optical fields. Here, we propose a compact mode sorter based on a subwavelength waveguide grating, designed using the eigenmode expansion method. We analyze the optical field distribution at the focal plane of the on-chip lens for various incident modes. Implemented on a silicon-on-insulator (SOI) platform, the device achieves efficient separation of TE0, TE1, and TE3 modes, within a footprint of only 8.3 µm. When assembled into a complete (de)multiplexer, the device yields a 0.79 dB, 0.97 dB, and 0.91 dB insertion loss for the TE0, TE1, and TE3 channels, and 114 nm (1493-1607 nm) bandwidth for all channels with insertion loss is under 1.5 dB while crosstalk below 15 dB. Our simulation of fabrication tolerances demonstrates that this approach offers superior robustness compared to traditional devices. This work presents a generalizable design framework for metamaterial-based on-chip lenses using eigenmode analysis, paving the way for compact mode splitting and reconstruction applications.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 9","pages":"2500-2503"},"PeriodicalIF":3.3,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818512","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Powell lens-driven flat-field TIRF illumination for quantitative super resolution imaging. 用于定量超分辨成像的鲍威尔透镜驱动的平场TIRF照明。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.596464

Mengfan Li, Jianzheng Feng, Wei Shi, Yiming Li

{"title":"Powell lens-driven flat-field TIRF illumination for quantitative super resolution imaging.","authors":"Mengfan Li, Jianzheng Feng, Wei Shi, Yiming Li","doi":"10.1364/OL.596464","DOIUrl":"https://doi.org/10.1364/OL.596464","url":null,"abstract":"Single-molecule localization microscopy (SMLM) provides nanometer-scale resolution but suffers from inhomogeneous excitation under conventional Gaussian total internal reflection fluorescence (TIRF) illumination. Spatial intensity variations reduce photon counts, distort fluorophore blinking kinetics, and degrade localization precision, particularly at the periphery of the field of view, thereby limiting quantitative and large-field SMLM imaging. Here, we present a simple orthogonal Powell (OP) lens configuration that converts a Gaussian beam into a uniform two-dimensional flat-top profile while remaining confined within the supercritical angular domain for TIRF excitation. Compared with Gaussian illumination, OP illumination expands the effective imaging area by 18-fold and achieves a penetration depth of ~300 nm, consistent with near-critical angle TIRF theory. Using nuclear pore complexes as biological rulers, we demonstrate uniform photon counts and consistent localization precision (<3.4% variation) across peripheral regions. Furthermore, 3D reconstructions of microtubules confirm spatially uniform high-quality imaging across the entire field of view. The OP system is compact, low-cost, and easily assembled from off-the-shelf components, while its square-like illumination geometry improves intensity utilization. This approach provides a practical solution for achieving uniform, large-field TIRF-SMLM, thereby combining high performance with broad accessibility.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 9","pages":"2600-2603"},"PeriodicalIF":3.3,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Reduce hypoxemia overestimation in pulse oximetry based on iso-pathlength: a Monte Carlo study. 减少低氧血症过高估计脉搏血氧测量基于等径长：蒙特卡洛研究。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.588131

Bar Atuar, Hamootal Duadi, Meir Nitzan, Dror Fixler

{"title":"Reduce hypoxemia overestimation in pulse oximetry based on iso-pathlength: a Monte Carlo study.","authors":"Bar Atuar, Hamootal Duadi, Meir Nitzan, Dror Fixler","doi":"10.1364/OL.588131","DOIUrl":"https://doi.org/10.1364/OL.588131","url":null,"abstract":"Pulse oximetry devices systematically overestimate blood oxygen saturation (SaO2) in hypoxemic patients, potentially masking critical conditions. We hypothesize that this bias stems from wavelength-dependent differences in optical pathlength (OPL), which vary with SaO2 levels. This Letter investigates the change in photon pathlength in tissue between different wavelengths and proposes the iso-pathlength (IPL) point, an angular position identifiable by constant intensity between media of varying scattering coefficients, as a solution. Using Monte Carlo (MC) simulations on a finger model (5% blood volume, 60-100% SaO2), we analyzed the OPL ratio at various exit angles for the standard 660/940 nm wavelength pair and a closer pair with 760/840 nm. Analysis revealed that at the standard pulse oximetry transmission position, the OPL ratio for the 660/940 nm pair is highly variable, ranging from 1.25 to 1.45 across SaO2 levels, while the OPL ratio for the alternative 760/840 nm pair changed from 1.05 to 1.12. In contrast, the OPL ratio at the IPL point remains stable, not exceeding 1.05 across all SaO2 levels. These MC results provide mechanistic insight into pulse oximetry bias and demonstrate that the IPL technique could help in the detection of critical hypoxemia, where current devices are most prone to dangerous overestimation.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 9","pages":"2424-2427"},"PeriodicalIF":3.3,"publicationDate":"2026-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147818541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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}

引用次数: 0

Effect of laser-beam diameter on the visibility of two-photon stimuli. 激光光束直径对双光子刺激可见性的影响。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-05-01 DOI: 10.1364/OL.589174

Agnieszka Zielińska, Daniel Rumiński, Maciej Szkulmowski, Maciej Wojtkowski, Katarzyna Komar

引用次数: 0