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Giant structurally modulated intrinsic chirality of quasi-bound states in continuum. 连续体中准束缚态的巨型结构调制本征手性。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.549705
Wen Kui Zhao, Sheng Yi Wang, Yu Hang Jing, Hua Ge, Qiu Wang, Yong Quan Zeng, Bo Wen Jia, Ning Xu
{"title":"Giant structurally modulated intrinsic chirality of quasi-bound states in continuum.","authors":"Wen Kui Zhao, Sheng Yi Wang, Yu Hang Jing, Hua Ge, Qiu Wang, Yong Quan Zeng, Bo Wen Jia, Ning Xu","doi":"10.1364/OL.549705","DOIUrl":"https://doi.org/10.1364/OL.549705","url":null,"abstract":"<p><p>Structurally modulated intrinsic chirality is a structural transformation phenomenon in photoresponsive molecules that is commonly utilized in biosensing and chemical analysis. In this study, we proposed an approach to achieve giant intrinsic chirality in a quasi-bound state in the continuum (Q-BICs)-slanted tetramer metasurface, where high Q factors and circular dichroism (CD) coexist. Empowered by the simultaneous resonance between toroidal dipole (TD) and electric quadrupole (EQ) modes, the intrinsic circular dichroism can be effectively tuned via variations in the slant angles of the metasurface. Our work not only addresses the lack of strong chiral materials in nature but also opens up new possibilities in chiroptical sensing, chemical analysis, and biotechnology.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1649-1652"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528115","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
Miniaturized fiber optic accelerometer incorporating liquid metal as the proof mass: publisher's note. 采用液态金属作为验证质量的微型光纤加速度计：出版商说明。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.559477
Chenxing Xue, Rui Zhou, Yuanjia Xia, Wei Gao, Min Li, Hongyun Gao, Xiaoyan Wen, Haifei Lu, Guobing Chen, Desheng Chen
{"title":"Miniaturized fiber optic accelerometer incorporating liquid metal as the proof mass: publisher's note.","authors":"Chenxing Xue, Rui Zhou, Yuanjia Xia, Wei Gao, Min Li, Hongyun Gao, Xiaoyan Wen, Haifei Lu, Guobing Chen, Desheng Chen","doi":"10.1364/OL.559477","DOIUrl":"https://doi.org/10.1364/OL.559477","url":null,"abstract":"<p><p>This publisher's note contains a correction to Opt. Lett.50, 241 (2025)10.1364/OL.536982.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1674"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528136","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
Dynamic modulation of nonreciprocal absorption in a graphene-InAs hybrid structure under low magnetic field and small incident angles.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.553323
Ye Ming Qing, Jiao Liu, Zhaoyan Yang, Liang Wei Wu, Yue Gou, Jun Wu, Bingxiang Li
{"title":"Dynamic modulation of nonreciprocal absorption in a graphene-InAs hybrid structure under low magnetic field and small incident angles.","authors":"Ye Ming Qing, Jiao Liu, Zhaoyan Yang, Liang Wei Wu, Yue Gou, Jun Wu, Bingxiang Li","doi":"10.1364/OL.553323","DOIUrl":"https://doi.org/10.1364/OL.553323","url":null,"abstract":"<p><p>Overcoming Kirchhoff's laws to achieve strong nonreciprocity enhances energy harvesting and thermal management. Current magneto-optical (MO) strategies need high magnetic excitation and large incident angles, hindering practicality. We designed a graphene-InAs hybrid for significant nonreciprocity between absorptivity and emissivity at small angles with just 0.16 T, showing practical potential. By tuning graphene's Fermi energy, nonreciprocity strength can be adjusted via resonance mode competition. This design offers new insights for dynamic nonreciprocal radiation devices under near-normal light and modest magnetic excitation, facilitating practical use.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1552-1555"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527952","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
High-efficiency lithium niobate optical mode switch using a mode-loop Mach-Zehnder interferometer.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.547552
Binjie Wang, Yongheng Jiang, Li Chen, Liheng Wang, Pu Zhang, Mingrui Yuan, Huifu Xiao, Mei Xian Low, Aditya Dubey, Thach Giang Nguyen, Qinfen Hao, Guanghui Ren, Arnan Mitchell, Yonghui Tian
{"title":"High-efficiency lithium niobate optical mode switch using a mode-loop Mach-Zehnder interferometer.","authors":"Binjie Wang, Yongheng Jiang, Li Chen, Liheng Wang, Pu Zhang, Mingrui Yuan, Huifu Xiao, Mei Xian Low, Aditya Dubey, Thach Giang Nguyen, Qinfen Hao, Guanghui Ren, Arnan Mitchell, Yonghui Tian","doi":"10.1364/OL.547552","DOIUrl":"https://doi.org/10.1364/OL.547552","url":null,"abstract":"<p><p>Mode-division multiplexing is a common technology in photonic integrated circuits, which can combine various optical mode signals into one single channel such as a multimode waveguide to improve the communication system's capacity. Optical mode switch plays a critical role in mode-division multiplexing, which can switch the optical signal into different mode channels. Here, we propose and experimentally demonstrate a high-efficiency optical mode switch with a half-wave voltage length product (<i>V</i><sub>π</sub><i>L</i>) of about 1.83 V·cm, an extinction ratio of 22.9 dB, and a switching time below 48.3 ps, using mode-loop Mach-Zehnder interferometer structure in the lithium niobate on insulator platform. This optical mode switch has a potential application in supporting high-speed data transmission for on-chip mode-division-multiplexing systems.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1691-1694"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528118","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
Investigation of LE-LIBS feasibility for detection of H, He, and O in high vacuum using geological samples.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.551623
R V L N Sridhar, S Malathi, Santosh Kumar, Ugra Mohan Roy, K V Sriram
{"title":"Investigation of LE-LIBS feasibility for detection of H, He, and O in high vacuum using geological samples.","authors":"R V L N Sridhar, S Malathi, Santosh Kumar, Ugra Mohan Roy, K V Sriram","doi":"10.1364/OL.551623","DOIUrl":"https://doi.org/10.1364/OL.551623","url":null,"abstract":"<p><p>This work reports the investigation of low-energy, eye-safe laser-induced breakdown spectroscopy (LE-LIBS) feasibility for <i>in situ</i> detection of gaseous elements significant to the planetary surface chemistry. A ns-pulsed laser emitting pulses of energy of 3 mJ at 1.54 μm wavelength is used to ablate soil pellet samples. Plasma emission spectra are acquired in the spectral window of 220-800 nm employing a concave flat-field spectrograph. Results presented here for the detection of three crucial elements, namely, hydrogen, helium, and oxygen, have demonstrated the applicability of the LE-LIBS approach in a vacuum environment, suiting the planetary surface exploration.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1500-1503"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528124","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
Polarization-insensitive and low-loss O-band edge coupler for silicon photonics.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.549748
Xiaolin Yi, Weike Zhao, Long Zhang, Daoxin Dai
{"title":"Polarization-insensitive and low-loss O-band edge coupler for silicon photonics.","authors":"Xiaolin Yi, Weike Zhao, Long Zhang, Daoxin Dai","doi":"10.1364/OL.549748","DOIUrl":"https://doi.org/10.1364/OL.549748","url":null,"abstract":"<p><p>Fiber-to-chip edge couplers (ECs) are critical for integrated photonic systems. Currently, the ECs are often designed with tiny structure sizes to achieve high coupling efficiency, which, however, are hindered by the lithography resolution limitation in foundry fabrication capabilities. In this work, we propose and experimentally demonstrate a low-loss and polarization-insensitive EC that overcomes the fabrication constraints in the feature size. This is enabled by an ultra-low-loss mode conversion happening in a specially developed bi-level taper with an ultra-tiny tip, which is formed by introducing a shallowly etched tilted taper on a fully etched inverse taper, showing an ultra-large overlay fabrication tolerance. The simulated coupling loss for TE- and TM-polarizations are 0.53-0.57 dB and 0.45-0.55 dB in the wavelength range of 1260-1360 nm, respectively, when coupled to a fiber with a mode field diameter of ∼4 µm. It is experimentally shown that the minimum coupling loss is ∼0.54 dB and the polarization-dependent loss is as low as ∼0.18 dB. The proposed method assisted by the overlay technology enables the easy fabrication of the structure with tiny feature sizes not only for high-efficiency edge coupling but also for other on-chip structures, making it a promising solution for a wide range of applications in photonic integration.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1699-1702"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528150","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-free selective reflection spectroscopy of electric-quadrupole transitions.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.542352
Eng Aik Chan, Syed Abdullah Aljunid, Athanasios Laliotis, David Wilkowski, Martial Ducloy
{"title":"Doppler-free selective reflection spectroscopy of electric-quadrupole transitions.","authors":"Eng Aik Chan, Syed Abdullah Aljunid, Athanasios Laliotis, David Wilkowski, Martial Ducloy","doi":"10.1364/OL.542352","DOIUrl":"https://doi.org/10.1364/OL.542352","url":null,"abstract":"<p><p>Electric-dipole-forbidden transitions play an important role in quantum sensing, quantum information, and fundamental tests in physics. As such, the development of novel and sensitive spectroscopic methods is of major interest. Here, we present a Doppler-free selective reflection experiment on the 6<sup>2</sup>S<sub>1/2</sub>-5<sup>2</sup>D<sub>5/2</sub> electric-quadrupole transition of cesium vapor at the vicinity of a sapphire window. The spectrum is obtained by precision experiments overcoming limitations due to the small-signal amplitude of forbidden transitions. The observed sub-Doppler lines allow us to measure the collisional broadening of the electric-quadrupole line. The interaction of cesium atoms with the sapphire surface of the cell is also evidenced, but, due to its weak contribution, a quantitative analysis remains challenging. Our experiment paves the way for further studies of the Casimir-Polder interaction between exotic excited-state atoms and dielectric surfaces.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1601-1604"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143527950","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
Hybrid fiber-based frequency dissemination and vibration sensing system.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.551324
Wenlin Li, Zhongwang Pang, Hongfei Dai, Chunyi Li, Bo Wang
{"title":"Hybrid fiber-based frequency dissemination and vibration sensing system.","authors":"Wenlin Li, Zhongwang Pang, Hongfei Dai, Chunyi Li, Bo Wang","doi":"10.1364/OL.551324","DOIUrl":"https://doi.org/10.1364/OL.551324","url":null,"abstract":"<p><p>In this Letter, we present an experimental demonstration of a hybrid fiber-based frequency dissemination and vibration sensing system. The hybrid system achieves frequency transfer stability of 3.3×10<sup>-14</sup>/<i>s</i> and 2.4×10<sup>-17</sup>/10<sup>5</sup><i>s</i> over a 60 km fiber link. Furthermore, accurate localizing of adverse event is demonstrated, which helps enhance operational and maintenance efficiency to ensure the stability of time-frequency synchronization networks.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1544-1547"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528122","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
Quadrant-partitioning uniformly distributed modulation for amplifier-free optical coherent systems.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.551968
Ziheng Zhang, Lizhi Wen, Yi Cai, Jian Zhao
{"title":"Quadrant-partitioning uniformly distributed modulation for amplifier-free optical coherent systems.","authors":"Ziheng Zhang, Lizhi Wen, Yi Cai, Jian Zhao","doi":"10.1364/OL.551968","DOIUrl":"https://doi.org/10.1364/OL.551968","url":null,"abstract":"<p><p>Amplifier-free coherent systems are promising for short-reach links, but these systems are constrained by signal peak power instead of average power. In this paper, we propose a novel, to the best of our knowledge, quadrant-partitioning uniformly distributed modulation (QP-UDM) scheme for peak-power-constrained amplifier-free systems. The proposed scheme achieves finer modulation orders than conventional UDM schemes. It also avoids the problem in conventional amplitude-division irregular quadrature amplitude modulation, where the order of check bit sequence would be disrupted when there are errors, resulting in the failure of forward error correction decoding. When compared to probabilistic shaping (PS), the proposed QP-UDM has a lower peak-to-average-power ratio. Experiments of a 28 Gbaud amplifier-free system with the modulation order varying from 36 to 104 show that the proposed QP-UDM scheme solves the problem of conventional UDM schemes and outperforms PS-QAM at the same entropy.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1597-1600"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528153","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
Joint probabilistic shaping and pre-equalization for hollow-core fiber transmission using end-to-end learning.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-01 DOI: 10.1364/OL.544447
Qi Xu, Ran Gao, Fei Wang, Zhaohui Cheng, Yi Cui, Zhipei Li, Dong Guo, Huan Chang, Lei Zhu, Qi Zhang, Xiaolong Pan, Shikui Shen, Guangquan Wang, Yanbiao Chang, Zheyu Wu, Xiangjun Xin
{"title":"Joint probabilistic shaping and pre-equalization for hollow-core fiber transmission using end-to-end learning.","authors":"Qi Xu, Ran Gao, Fei Wang, Zhaohui Cheng, Yi Cui, Zhipei Li, Dong Guo, Huan Chang, Lei Zhu, Qi Zhang, Xiaolong Pan, Shikui Shen, Guangquan Wang, Yanbiao Chang, Zheyu Wu, Xiangjun Xin","doi":"10.1364/OL.544447","DOIUrl":"https://doi.org/10.1364/OL.544447","url":null,"abstract":"<p><p>In this Letter, we propose a novel, to the best of our knowledge, end-to-end (E2E) learning scheme leveraging a time-frequency decoupling network (TFDnet) for joint probabilistic shaping (PS) and pre-equalization in hollow-core fiber (HCF)-based wavelength division multiplexing (WDM) systems. The TFDnet emulator effectively models HCF transmission channels by decoupling signal impairments into high-frequency, linear, and nonlinear distortions. Furthermore, a TFDnet emulator-based E2E strategy for joint PS and pre-equalization is presented with the aim of compensating the signal impairment for the HCF-based WDM systems. An experiment is conducted on a 30-channel HCF-based WDM system over a 10 km HCF. The experimental results demonstrate that the proposed TFDnet-based joint PS and pre-equalization scheme achieves the same bit-error rate (BER) performance with optical signal-to-noise ratio (OSNR) improvements of 1.0 dB and 1.6 dB compared to conditional generative adversarial network (CGAN)-based and traditional joint PS and pre-equalization scheme, respectively, under a 20% hard-decision forward error correction (HD-FEC) threshold. These results highlight the potential of the proposed scheme for ultrahigh-capacity HCF communication systems.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 5","pages":"1679-1682"},"PeriodicalIF":3.1,"publicationDate":"2025-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143528125","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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