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Platicons in lithium niobate microresonators with the photorefractive effect. 具有光折变效应的铌酸锂微谐振器中的铂。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.565030
Xujia Zhang, Tianyi Li, Jianping Chen, Kan Wu
{"title":"Platicons in lithium niobate microresonators with the photorefractive effect.","authors":"Xujia Zhang, Tianyi Li, Jianping Chen, Kan Wu","doi":"10.1364/OL.565030","DOIUrl":"https://doi.org/10.1364/OL.565030","url":null,"abstract":"<p><p>Platicon microcombs have been demonstrated on various material platforms, offering wide spectral bandwidth, excellent spectral flatness, and efficient power conversion, which are of interest for numerous applications. Lithium niobate (LN) with its Pockels and Kerr effects has become a promising platform for both generating and controlling microcombs. The photorefractive (PR) effect intrinsic to LN significantly influences the dynamics of Kerr frequency comb generation in microresonators. Here, we experimentally and theoretically analyze platicons in a LN microresonator, demonstrating that the PR effect promotes comb generation during scans from the red-detuned side but hinders it when scanning from the blue-detuned side. We also report platicon microcombs generated in normal-dispersion LN microresonators, which span over 250 nm and achieve a conversion efficiency of 13.5%. This Letter expands the understanding of LN microresonators with the PR effect and highlights their potential as platforms to develop highly efficient and flat optical comb sources.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4054-4057"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289569","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
Stabilization of a whispering gallery mode self-injection locked laser based on phase difference control. 基于相位差控制的窃窃廊模式自注入锁定激光器的稳定。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.559167
Qingbo Liu, Lihong Duan, Ning Ma, Wei Quan, Gang Liu
{"title":"Stabilization of a whispering gallery mode self-injection locked laser based on phase difference control.","authors":"Qingbo Liu, Lihong Duan, Ning Ma, Wei Quan, Gang Liu","doi":"10.1364/OL.559167","DOIUrl":"https://doi.org/10.1364/OL.559167","url":null,"abstract":"<p><p>We investigate the application of feedback control of phase difference between the whispering gallery mode microresonator and the laser cavity, for the stabilization of self-injection locking. By analyzing the relationship between phase difference and microresonator transmitted light intensity, as well as the characteristics of selected phase shift devices and controller, the phase difference is successfully maintained at the set point. Through this phase difference control mechanism, the semiconductor laser with a high-quality microresonator coupled and connected by optical fibers exhibits a stable self-injection locking. Key performance metrics include a narrow linewidth of around 200 Hz and a minimum normalized output wavelength Allan deviation of 1×10<sup>-10</sup>. This approach presents a promising and reliable solution for the self-injection locked laser stabilization.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3958-3961"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289581","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
Sum-frequency generation in bound-state-in-continuum microring resonators. 连续界态微环谐振器的和频产生。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.561879
Fan Ye, Xiankai Sun, Hon Ki Tsang
{"title":"Sum-frequency generation in bound-state-in-continuum microring resonators.","authors":"Fan Ye, Xiankai Sun, Hon Ki Tsang","doi":"10.1364/OL.561879","DOIUrl":"https://doi.org/10.1364/OL.561879","url":null,"abstract":"<p><p>Bound states in the continuum (BICs) can facilitate strong optical mode confinement for nonlinear optical applications. Recently, BICs were used for low-loss photonic integrated circuits, enabling waveguides to be fabricated without etching on material platforms which do not have mature low-loss etching processes. Here, we show experimentally that the losses in BIC microring resonators are sufficiently low for efficient sum-frequency generation (SFG) on an etchless lithium niobate platform. The normalized conversion efficiency is measured to be 6.45 × 10<sup>-6 </sup>mW<sup>-1</sup>. These results establish the feasibility of this approach for exploring the use of what we believe to be novel functional materials for nonlinear integrated photonics.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4034-4037"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289583","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
Ultra-sensitive boric acid detection using a plasmonic fiber-optic spectral comb and MEA modified with gold nanoparticles. 利用等离子体光纤光谱梳和金纳米粒子修饰的MEA进行超灵敏硼酸检测。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.564261
Yunchang Wang, Xijie Feng, Yunjie Cao, Shu Fang, Jie Dong, Anhua Dong, Ruotong Tian, Jun Zhou, Changyu Shen
{"title":"Ultra-sensitive boric acid detection using a plasmonic fiber-optic spectral comb and MEA modified with gold nanoparticles.","authors":"Yunchang Wang, Xijie Feng, Yunjie Cao, Shu Fang, Jie Dong, Anhua Dong, Ruotong Tian, Jun Zhou, Changyu Shen","doi":"10.1364/OL.564261","DOIUrl":"https://doi.org/10.1364/OL.564261","url":null,"abstract":"<p><p>Even trace amounts of boric acid (BA) could cause serious harm to human beings and the environment. Therefore, trace BA detection is very important. Here, we propose a tilted fiber Bragg grating (TFBG)-based plasmonic fiber-optic spectral comb for ultra-low limit BA detection. The TFBG is coated with a gold film to excite the surface plasmon resonance (SPR) effect, and mercaptoethylamine (MEA) molecules are self-assembled and fixed on the gold film to form a BA probe. MEA molecules can form a stable coordination structure with BA molecules to realize TFBG-SPR BA detection. To enhance the sensor's sensitivity, using MEA modified with gold nanoparticles (AuNPs) to combine with BA molecules, the combination-induced aggregation of AuNPs induces a significant spectral response. The proposed sensor shows highly sensitive detection of BA under the detection range of 1 fM-1 nM, with a detection limit of 1.01 × 10<sup>-15</sup> mol/L (1.01 fM), which is more than five orders of magnitude lower than those of the previously reported methods. The proposed sensor not only shows practical application of BA detection but also provides a new, to the best of our knowledge, way for the TFBG-SPR biochemical sensor to achieve high RI sensitivity.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4126-4129"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289587","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
915 nm single-frequency all-PM all-fiber ring laser with kHz-level linewidth. 915 nm单频全pm全光纤环形激光器，线宽khz级。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.562000
Kui Jiang, Jingbin Lan, Lan Lan, Shuo Zhang, Yongcheng He, Ran Xia, Zhengqian Luo
{"title":"915 nm single-frequency all-PM all-fiber ring laser with kHz-level linewidth.","authors":"Kui Jiang, Jingbin Lan, Lan Lan, Shuo Zhang, Yongcheng He, Ran Xia, Zhengqian Luo","doi":"10.1364/OL.562000","DOIUrl":"https://doi.org/10.1364/OL.562000","url":null,"abstract":"<p><p>Single-frequency fiber laser is of principal role either in frontier interdisciplinary science or advanced practical applications. Here, we present a 1-kHz-level linewidth 915 nm all-polarization-maintaining Nd<sup>3+</sup>-doped single-frequency all-fiber laser featuring a ring cavity configuration. Particularly, a piece of commercial unpumped Nd<sup>3+</sup>-doped single-cladding silica fiber is employed to achieve a single longitudinal mode operation by forming a dynamic grating. By introducing a fiber amplifier, a 915.24 nm single-frequency all-fiber laser with a linewidth of 1.58 kHz is obtained. To the best of our knowledge, this is the narrowest linewidth, as well as the first ring cavity scheme reported in a Nd<sup>3+</sup>-doped single-frequency all-fiber laser at the 900 nm band. This work provides significant potential for the future development of high-performance lasers utilizing the <sup>4</sup>F<sub>3/2</sub>-<sup>4</sup>I<sub>9/2</sub> transition of neodymium ions.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3887-3890"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289492","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
A high-performance polarization-enhanced black phosphorus photodetector by a nonlocal metasurface. 基于非局部超表面的高性能偏振增强黑磷光电探测器。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.567065
Fangjie Wang, Hanlei Xu, Qiongqiong Gu, Chaoying Shi, Lei Zhang, Zhujing Wu, Guoliang Deng, Hao Zhou, Andrew T S Wee, Shouhuan Zhou
{"title":"A high-performance polarization-enhanced black phosphorus photodetector by a nonlocal metasurface.","authors":"Fangjie Wang, Hanlei Xu, Qiongqiong Gu, Chaoying Shi, Lei Zhang, Zhujing Wu, Guoliang Deng, Hao Zhou, Andrew T S Wee, Shouhuan Zhou","doi":"10.1364/OL.567065","DOIUrl":"https://doi.org/10.1364/OL.567065","url":null,"abstract":"<p><p>Black phosphorus (BP) is a promising two-dimensional (2D) material with extraordinary optical anisotropic properties in the near-infrared region (NIR). It is widely exploited in NIR photodetecting, NIR imaging, and NIR polarization detecting. Despite its superior anisotropy, the polarized response is still limited to several layers. We present a polarization-enhanced black phosphorus photodetector based on a nonlocal metasurface. Benefiting from enhanced light-BP interaction, the device responsivity is improved by 7 times over that of non-enhancement. At zero bias, our device has a responsivity of 9.13 mA/W with 1514 nm incidence. Our photodetector performs an ability to enhance the selective polarization photoresponse of BP armchair direction or zigzag directions by changing the BP placement. Enhanced by polarization sensitive resonance, the cross polarization response ratio (PR) increases from ∼2.3 to ∼13.1. Our results indicate that the device has potential for NIR polarization imaging and polarization multiplexing detecting areas.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4098-4101"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289493","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
Axial artifact suppression and precise characterization of three-dimensional optical coherence tomography microangiograms. 三维光学相干断层微血管成像的轴向伪影抑制和精确表征。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.563108
Lingxi Zhou, Jia Meng, Shuhao Qian, Zhihua Ding, Zhiyi Liu
{"title":"Axial artifact suppression and precise characterization of three-dimensional optical coherence tomography microangiograms.","authors":"Lingxi Zhou, Jia Meng, Shuhao Qian, Zhihua Ding, Zhiyi Liu","doi":"10.1364/OL.563108","DOIUrl":"https://doi.org/10.1364/OL.563108","url":null,"abstract":"<p><p>Optical coherence tomography angiography (OCTA) is a label-free imaging technique widely used in ophthalmology. However, the presence of vascular axial tail artifacts makes it challenging to utilize the three-dimensional (3D) information from OCTA data. Herein, we proposed a method combining morphology-based filtering and vascular thickness characteristics to effectively suppress tail artifacts in 3D retinal OCTA images. Compared to traditional tail artifact suppression methods such as mean subtraction and Hessian filtering, our method exhibited superior performance, enabling more accurate extraction of 3D vascular architecture. Post artifact removal, the vascular structures exhibited more concentrated distributions in morpho-structural features compared to those acquired from regular OCTA data. Finally, leveraging these advantages, we achieved the differentiation between normal and diabetic retinopathy retinas through precise characterization.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3986-3989"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289497","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-excitation multispectral fluorescence lifetime imaging handheld endoscope for label-free metabolic and biochemical imaging of the oral mucosa. 双激发多光谱荧光寿命成像手持式内窥镜用于口腔黏膜无标记代谢和生化成像。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.561483
Gabriel Tortorelli, Rodrigo Cuenca, Michael J Serafino, Kayla Caughlin, Carlos Busso, Victoria L Woo, Jacqueline Plemons, Yi-Shing L Cheng, Celeste Abraham, Ying S Wang, Rashmi Hegde, Javier A Jo
{"title":"Dual-excitation multispectral fluorescence lifetime imaging handheld endoscope for label-free metabolic and biochemical imaging of the oral mucosa.","authors":"Gabriel Tortorelli, Rodrigo Cuenca, Michael J Serafino, Kayla Caughlin, Carlos Busso, Victoria L Woo, Jacqueline Plemons, Yi-Shing L Cheng, Celeste Abraham, Ying S Wang, Rashmi Hegde, Javier A Jo","doi":"10.1364/OL.561483","DOIUrl":"https://doi.org/10.1364/OL.561483","url":null,"abstract":"<p><p>This work introduces a dual-excitation, multispectral-detection, frequency-domain fluorescence lifetime imaging (FLIM) handheld endoscopy system for comprehensive autofluorescence imaging of the oral mucosa. The excitation wavelengths and spectral detection channels were selected to preferentially image the fluorescence of endogenous fluorophores relevant for oral epithelial cancer detection. The endoscope dimensions and optical specifications enable direct imaging of oral lesions with minimal patient discomfort. Comprehensive imaging experiments using standard fluorophores demonstrate the capabilities of the FLIM endoscope to measure a wide range of fluorescence lifetimes (0.1-12 ns) with high precision (∼100 ps). Clinical <i>in vivo</i> label-free metabolic and biochemical endoscopic FLIM imaging was demonstrated by imaging a malignant oral lesion and healthy mucosa in a patient undergoing a tissue biopsy procedure.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3966-3969"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289510","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
Highly efficient electroluminescence from Si quantum dot/SiO2 multilayer light-emitting devices via phosphorus/boron co-doping and surface nano-structuring. 磷硼共掺杂和表面纳米结构制备的硅量子点/SiO2多层发光器件的高效电致发光。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.566303
Junnan Han, Yuhao Wang, Jiaming Chen, Teng Sun, Dongke Li, Wei Li, Ling Xu, Jun Xu, Kunji Chen
{"title":"Highly efficient electroluminescence from Si quantum dot/SiO<sub>2</sub> multilayer light-emitting devices via phosphorus/boron co-doping and surface nano-structuring.","authors":"Junnan Han, Yuhao Wang, Jiaming Chen, Teng Sun, Dongke Li, Wei Li, Ling Xu, Jun Xu, Kunji Chen","doi":"10.1364/OL.566303","DOIUrl":"https://doi.org/10.1364/OL.566303","url":null,"abstract":"<p><p>Enhancing emission efficiency presents a challenge for Si-based light emission devices in all-silicon monolithic optoelectronic integration. This study introduces phosphorus (P)/boron (B) co-doping to significantly increase the electroluminescence intensity of Si quantum dots (QDs)-nearly tenfold compared to undoped devices. The turn-on voltage drops from 15 V for undoped to 6 V for co-doped devices and further reduces to 3 V with a nanostructured Si substrate to improve light extraction efficiency. The redshift of electroluminescence peak after co-doping is also observed, and the possible mechanism is briefly discussed. Stability tests show power efficiency up to 1.02% and maximum external quantum efficiency of 4.9%. These findings demonstrate the superior optoelectronic quality and stability of silicon nanomaterial-based devices, highlighting their potential in integrated silicon photonics.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3927-3930"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289530","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
Non-volatile optical switch based on Sb2Se3-loaded three-mode interference. 基于sb2se3负载三模干涉的非易失性光开关。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.560265
Xinxin Zhao, Xiaolong Liu, Yujiao Tao, Lei Yang, Kai Xu, Hongtao Lin, Peipeng Xu, Wei Zhang
{"title":"Non-volatile optical switch based on Sb<sub>2</sub>Se<sub>3</sub>-loaded three-mode interference.","authors":"Xinxin Zhao, Xiaolong Liu, Yujiao Tao, Lei Yang, Kai Xu, Hongtao Lin, Peipeng Xu, Wei Zhang","doi":"10.1364/OL.560265","DOIUrl":"https://doi.org/10.1364/OL.560265","url":null,"abstract":"<p><p>In this Letter, we propose a non-volatile switch based on multimode interference in an Sb<sub>2</sub>Se<sub>3</sub>-loaded waveguide. By implementing low-loss phase control within a multimode interference coupler, this design effectively manages the self-imaging phase shift length during a single phase change cycle. The fabricated multiplexed optical switch exhibits impressive performance characteristics, including a low insertion loss of ∼ 1.5 dB, a compact length of ∼35 μm, and minimal cross talk below -6 dB over a 35 nm bandwidth for both the amorphous and crystalline states. The ability to reconfigure light routing via Sb<sub>2</sub>Se<sub>3</sub> phase transitions opens new avenues for optical field-programmable gate arrays and high-density photonic processors.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4022-4025"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289562","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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