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Kerker-superscattering via gain media. 通过增益介质的kerker -超散射。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.563151
Ao Li, Chan Wang, Xuhuinan Chen, Chenxu Bian, Xinyan Zhang, Weiqi Cai, Hongsheng Chen, Xiao Lin
{"title":"Kerker-superscattering via gain media.","authors":"Ao Li, Chan Wang, Xuhuinan Chen, Chenxu Bian, Xinyan Zhang, Weiqi Cai, Hongsheng Chen, Xiao Lin","doi":"10.1364/OL.563151","DOIUrl":"https://doi.org/10.1364/OL.563151","url":null,"abstract":"<p><p>Superscattering offers an enticing route to significantly enhance the scattering cross section of subwavelength scatterers, far exceeding the single-channel scattering limit. It is of paramount importance to many applications, such as optical sensing, antennas, and imaging. However, the superscattering phenomenon is generally accompanied with nonzero forward-scattered light. Here, we find the possibility of creating the exotic phenomenon of superscattering with zero forward-scattered light by exploiting the optical gain. The underlying mechanism is that the optical gain can facilitate the realization of not only the single-channel superscattering but also the second Kerker effect, which is intrinsically related to the zero forward scattering phenomenon. Because of the importance of the second Kerker effect in regulating the directionality of superscattering, this revealed phenomenon is termed as Kerker-superscattering.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3824-3827"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289554","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
Passively Q-switched Tm:YLF laser based on Ho:YAG crystal as a saturable absorber. 基于Ho:YAG晶体作为饱和吸收体的被动调q Tm:YLF激光器。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.561632
Neria Suliman, Ishay Shalman, Rotem Nahear, Salman Noach
{"title":"Passively Q-switched Tm:YLF laser based on Ho:YAG crystal as a saturable absorber.","authors":"Neria Suliman, Ishay Shalman, Rotem Nahear, Salman Noach","doi":"10.1364/OL.561632","DOIUrl":"https://doi.org/10.1364/OL.561632","url":null,"abstract":"<p><p>A millijoule-level passively Q-switched Tm:YLF solid-state laser, utilizing a Ho:YAG as a saturable absorber, is presented. A volume Bragg grating (VBG) is implemented as the output coupler to stabilize the laser wavelength to the holmium absorption peak of 1879.3 nm, thereby overcoming the challenges of using holmium-doped crystals as saturable absorbers and enabling high-energy pulse generation. Pulse energies up to 2.7 mJ at repetition rates up to 100 Hz were achieved, with beam quality measured to be M<sup>2</sup> < 1.1. This work addresses the limitations of holmium-doped crystals as saturable absorbers for thulium lasers, demonstrating their potential for high-energy pulse production in the 2 <i>μ</i>m range.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3915-3918"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289567","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
Photonics-based broadband radar target simulator for generating micro-Doppler signatures. 用于产生微多普勒特征的光子学宽带雷达目标模拟器。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.565322
Yunlu Xing, Shangyuan Li, Xiaoxiao Xue, Xiaoping Zheng
{"title":"Photonics-based broadband radar target simulator for generating micro-Doppler signatures.","authors":"Yunlu Xing, Shangyuan Li, Xiaoxiao Xue, Xiaoping Zheng","doi":"10.1364/OL.565322","DOIUrl":"https://doi.org/10.1364/OL.565322","url":null,"abstract":"<p><p>Micro-Doppler (MD) signatures provide radar systems with an additional dimension, significantly enhancing their capabilities in target detection and identification. However, there is currently a lack of broadband radar target simulators (RTSs) capable of generating MD signatures. To address this issue, this paper proposes a photonics-based RTS. The emitted signal from the radar under test (RUT) is modulated onto a broadband optical source. The optical spectra are then tailored to simulate micro-motions. Through frequency-to-time mapping, the optical spectra are converted into simulated echoes, allowing the generation of MD signatures. In the experiment, X-band radar signals with 4 GHz bandwidth are processed, and MD signatures corresponding to human walking and bird flight are successfully generated.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4090-4093"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289568","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
Speckle noise reduction in laser projection using a liquid crystal device with stacked microstructured electrodes. 利用叠层微结构电极液晶器件降低激光投影中的散斑噪声。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.559764
Che Ju Hsu, Mareena Antony, Mudassar Iqbal, Chi Yen Huang
{"title":"Speckle noise reduction in laser projection using a liquid crystal device with stacked microstructured electrodes.","authors":"Che Ju Hsu, Mareena Antony, Mudassar Iqbal, Chi Yen Huang","doi":"10.1364/OL.559764","DOIUrl":"https://doi.org/10.1364/OL.559764","url":null,"abstract":"<p><p>Laser speckle is a major challenge for laser projectors, and its reduction is crucial for improving laser display technologies. This study introduces a tunable multifocal liquid crystal microlens array (TMLCMA) with a triple-electrode structure and vertically aligned liquid crystals exhibiting negative dielectric anisotropy, designed to mitigate speckle noise. The TMLCMA operates in three modes: monofocal concave, multifocal concave, and multifocal convex, depending on the voltage driving scheme used. In monofocal modes, the speckle contrast decreases from 0.46 to 0.35; in multifocal modes, it is further reduced from 0.46 to 0.15. These multifocal properties effectively disrupt laser coherence, leading to a greater reduction in speckle noise compared to a conventional monofocal microlens array. Our results demonstrate that integrating the TMLCMA into the laser projection system significantly enhances image quality, underscoring its potential for improving laser display performance.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3812-3815"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289579","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
Sub-50-pm displacement sensing via phase-matched metasurface-prism configuration. 通过相位匹配的超表面棱镜配置的亚50 pm位移传感。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.563241
Zhouxin Liang, Xin Gu, Jiaqi Li, Lixun Wu, Zhaoxiang Zhu, Shuqing Lin, Yuhang Lin, Yujie Chen, Siyuan Yu
{"title":"Sub-50-pm displacement sensing via phase-matched metasurface-prism configuration.","authors":"Zhouxin Liang, Xin Gu, Jiaqi Li, Lixun Wu, Zhaoxiang Zhu, Shuqing Lin, Yuhang Lin, Yujie Chen, Siyuan Yu","doi":"10.1364/OL.563241","DOIUrl":"https://doi.org/10.1364/OL.563241","url":null,"abstract":"<p><p>Accurate transverse displacement measurement at the picometer scale is essential for advancing ultraprecision metrology and probing microscopic physical interactions. Here, we demonstrate a high-precision transverse displacement sensor leveraging a phase-matched Pancharatnam-Berry (PB) metasurface and trapezoidal prism configuration, which simplifies optical alignment by eliminating stringent Talbot self-imaging requirements. By synergistically matching the phase gradient of the PB metasurface with the prism geometry, we enable robust signal extraction through the photonic spin Hall effect, while a near-infrared source (<i>λ</i> = 1550 nm) suppresses environmental interference. Differential amplification further rejects common-mode noise from laser fluctuations and electronic drift. The system achieves a displacement resolution of 46.18 pm under quasi-static conditions (0.2-100 Hz) and 124.86 pm across the full operational bandwidth (0.2-1.25 MHz), surpassing conventional polarization-encoded schemes in both sensitivity and practicality. This work thus presents a strategy for metasurface-enhanced metrology via geometric-phase-engineered photonic architectures, with transformative potential across applications from semiconductor lithography to quantum optomechanics.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3919-3922"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289582","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
Wave vector filter based on surface and Tamm plasmon polaritons. 基于表面和Tamm等离激元极化的波矢量滤波器。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.562436
Qixiang Jia, Qingquan Liu, Xueyu Guan, Peiqi Yu, Hengyi Cui, Zhongshi Huang, Ruonan Ji, Hailing Wang, Wei Lu, Shaowei Wang
{"title":"Wave vector filter based on surface and Tamm plasmon polaritons.","authors":"Qixiang Jia, Qingquan Liu, Xueyu Guan, Peiqi Yu, Hengyi Cui, Zhongshi Huang, Ruonan Ji, Hailing Wang, Wei Lu, Shaowei Wang","doi":"10.1364/OL.562436","DOIUrl":"https://doi.org/10.1364/OL.562436","url":null,"abstract":"<p><p>This study proposes a wave vector filter leveraging coupling-induced transparency (CIT) between surface plasmon polaritons (SPPs) and Tamm plasmon polaritons (TPPs) to enable simultaneous wavelength and incident-angle selection, overcoming conventional optical filters' inability to control both parameters. By synergizing the wave vector selectivity of SPPs with the low-loss field enhancement of TPPs, the device achieves efficient spectral-angular filtering in the short-wave infrared regime. Structural optimization of silver gratings and Ag/distributed Bragg reflector (DBR) layers yields a 60% transmission peak at 2.08 μm. The transmission intensity decreases by an order of magnitude with 0.2° angular deviation, demonstrating exceptional wave vector selectivity. Experimental validation confirms the angle-wavelength dual-selectivity mechanism, showing strong agreement with theoretical models. This work addresses critical challenges in multi-parameter photonic control, offering a breakthrough for hyperspectral imaging, multi-channel sensing, and on-chip nonlinear photonic systems. The CIT-based platform provides a novel design paradigm, to the best of our knowledge, for advanced photonic devices requiring joint spectral-spatial resolution.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3939-3942"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289589","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
Ambient-stable Mg2+-doped Cs3Cu2I5 nanocrystals with enhanced photoluminescence for color conversion blue LEDs. 环境稳定的Mg2+掺杂Cs3Cu2I5纳米晶体与增强光致发光的颜色转换蓝色led。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.560908
Xuanming Zhang, Yang Tang, Chenfeng Lin, Hao Xie, Ronglei Fan, Dongdong Yan, Xiaoyu Wang, Yongfeng Liu, Weixiang Ye
{"title":"Ambient-stable Mg<sup>2+</sup>-doped Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> nanocrystals with enhanced photoluminescence for color conversion blue LEDs.","authors":"Xuanming Zhang, Yang Tang, Chenfeng Lin, Hao Xie, Ronglei Fan, Dongdong Yan, Xiaoyu Wang, Yongfeng Liu, Weixiang Ye","doi":"10.1364/OL.560908","DOIUrl":"https://doi.org/10.1364/OL.560908","url":null,"abstract":"<p><p>We successfully synthesized Mg<sup>2+</sup>-doped Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> nanocrystals (NCs) under ambient conditions. The 10% Mg<sup>2+</sup>-doped Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> NCs exhibit significantly enhanced optical properties, achieving a photoluminescence quantum yield (PLQY) of 25.80% and a narrow emission full width at half maximum (FWHM) of 78 nm. The 10% Mg<sup>2+</sup>-doped NCs also exhibited improved thermal and water stability, retaining 67% of their initial photoluminescence (PL) intensity when heated from 25°C to 100°C and maintaining blue light emission after 30 min in aqueous environments. When integrated into a color conversion LED, these NCs achieved simultaneous improvements in emission characteristics, showing a narrowed FWHM (81 nm) and higher emission efficiency compared to undoped counterparts.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3840-3843"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289495","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
Doppler OCT verifies pulsation-induced anisotropic vessel lumen dynamics in the human retina. 多普勒OCT验证脉动诱导的人视网膜各向异性血管腔动力学。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.555324
Tobiloba Adejumo, Taeyoon Son, Guangying Ma, Mojtaba Rahimi, Albert Dadzie, Jie Ding, Xincheng Yao
{"title":"Doppler OCT verifies pulsation-induced anisotropic vessel lumen dynamics in the human retina.","authors":"Tobiloba Adejumo, Taeyoon Son, Guangying Ma, Mojtaba Rahimi, Albert Dadzie, Jie Ding, Xincheng Yao","doi":"10.1364/OL.555324","DOIUrl":"https://doi.org/10.1364/OL.555324","url":null,"abstract":"<p><p>This study verifies anisotropic vessel pulsatility in human retinas. Doppler optical coherence tomography (OCT) was utilized for dynamic monitoring of peripapillary vessel lumen dynamics. Quantitative analysis consistently revealed larger axial compared to lateral lumen changes, with an axial-to-lateral pulsation change ratio of 1.26 ± 0.08. These findings highlight the anisotropic biomechanical properties of retinal tissues, which contribute to direction-dependent vascular dynamics. Quantitative assessment of anisotropic vascular biomechanics offers promising insights for improving the detection of vascular alterations associated with ocular conditions.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3903-3906"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289508","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
Dual-functional optical fiber SERS probe with high sensitivity and self-cleaning. 双功能高灵敏度自清洁光纤SERS探针。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.564493
Conghui Li, Shen Shen, Wang Ning, Zhang Jie
{"title":"Dual-functional optical fiber SERS probe with high sensitivity and self-cleaning.","authors":"Conghui Li, Shen Shen, Wang Ning, Zhang Jie","doi":"10.1364/OL.564493","DOIUrl":"https://doi.org/10.1364/OL.564493","url":null,"abstract":"<p><p>This paper proposes a surface-enhanced Raman scattering (SERS) probe based on silver nanocubes (Ag NCs) on a tapered optical fiber, offering both high sensitivity and self-cleaning functionality. The Ag NCs were synthesized using a polyol method and subsequently deposited uniformly onto the fiber surface via laser-induced deposition to construct the SERS probe. Experimental results show that the probe can detect Rhodamine 6 G (R6 G) as low as 10<sup>-11</sup> mol/L, with an analytical enhancement factor (AEF) of 6.77 × 10<sup>8</sup>. Laser irradiation promotes the desorption of surface molecules of the optical fiber SERS probe, enabling efficient cleaning. The Raman signals remain highly stable over four cleaning cycles, confirming the probe's superior performance in repeated use. The probe is also capable of recognizing multiple molecules, including R6 G, malachite green (MG), and crystal violet (CV). Furthermore, Raman detection of uric acid at 50 μmol/L and uremic acid at 1 mmol/L concentrations was also achieved. This study provides new insights for high-sensitivity, low-cost, and reusable SERS sensors, with significant potential for applications in biomedical and environmental monitoring.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3923-3926"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289511","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
Fifth-harmonic and five-photon excitation fluorescence multiphoton microscopy. 五次谐波和五光子激发荧光多光子显微镜。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.566910
Joshua H Magnus, Lam T Nguyen, Elana G Alevy, Travis W Sawyer, Samuel D Crossley, Khanh Kieu
{"title":"Fifth-harmonic and five-photon excitation fluorescence multiphoton microscopy.","authors":"Joshua H Magnus, Lam T Nguyen, Elana G Alevy, Travis W Sawyer, Samuel D Crossley, Khanh Kieu","doi":"10.1364/OL.566910","DOIUrl":"https://doi.org/10.1364/OL.566910","url":null,"abstract":"<p><p>We report the application of fifth-harmonic and five-photon excitation fluorescence multiphoton microscopy. This novel, to our knowledge, label-free imaging modality has been characterized with spectral and power dependence measurements. The advantages of fifth-harmonic and five-photon excitation fluorescence imaging are higher resolution and use of longer wavelength excitation sources, which may allow deeper penetration depth while still exciting near-UV to blue fluorophores. This imaging modality may find interesting applications in biological research, materials characterization, geologic studies, and semiconductor manufacturing.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3931-3934"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289522","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
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