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Integrated polarization beam splitters in the silicon nitride platform for 950 nm and 1300 nm wavelengths.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.560110
Zindine Mokeddem, William Fraser, Martin Vachon, Winnie N Ye, Laurent Vivien, Delphine Marris-Morini, Eric Cassan, Carlos Alonso-Ramos, Dan-Xia Xu, Jianhao Zhang, Maziyar Milanizadeh, Yuri Grinberg, Pavel Cheben, Jens H Schmid, Daniele Melati
{"title":"Integrated polarization beam splitters in the silicon nitride platform for 950 nm and 1300 nm wavelengths.","authors":"Zindine Mokeddem, William Fraser, Martin Vachon, Winnie N Ye, Laurent Vivien, Delphine Marris-Morini, Eric Cassan, Carlos Alonso-Ramos, Dan-Xia Xu, Jianhao Zhang, Maziyar Milanizadeh, Yuri Grinberg, Pavel Cheben, Jens H Schmid, Daniele Melati","doi":"10.1364/OL.560110","DOIUrl":"https://doi.org/10.1364/OL.560110","url":null,"abstract":"<p><p>Photonic integration in a silicon nitride (SiN) platform enables low propagation losses and a wide transparency range, making it ideal for quantum applications. However, polarization control in SiN is challenging because of its low birefringence. This work demonstrates polarization beam splitters using asymmetric directional couplers in SiN, designed for 950 nm and 1300 nm wavelengths. These devices exhibit low insertion losses (<1 dB) and high polarization extinction ratios (20 dB-30 dB).</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2310-2313"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753940","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
Michelson interferometer-based coherent demodulation for joint time and frequency transfer.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.547452
Qingwei Liu, Hao Gao, Jiameng Dong, Zhaohui Wang, Rui Zhang, Guohua Wu, Song Yu, Bin Luo
{"title":"Michelson interferometer-based coherent demodulation for joint time and frequency transfer.","authors":"Qingwei Liu, Hao Gao, Jiameng Dong, Zhaohui Wang, Rui Zhang, Guohua Wu, Song Yu, Bin Luo","doi":"10.1364/OL.547452","DOIUrl":"https://doi.org/10.1364/OL.547452","url":null,"abstract":"<p><p>A high-precision joint time and radio frequency (RF) transfer scheme based on coherent demodulation is demonstrated. A one-pulse-per-second (1 PPS) time signal and an RF signal, transmitted at the same wavelength over a fiber link, are coherently demodulated at the receiver. Coherent demodulation is then achieved using a Michelson interferometer (MI), with balanced detection employed to enhance the signal-to-noise ratio (SNR) of the demodulated signals. An interferometer differential delay of 1042 ps is precisely designed through microwave phase discrimination techniques, enabling simultaneous demodulation of both time and RF signals. A joint time and frequency transfer experiment is then performed over a 560 km fiber link. The time stability (TDEV), measured as time deviation, of 1 PPS reached 31.1 ps at 1 s and 3.9 ps at 10,000 s. The frequency stability, in terms of Allan deviation (ADEV), for a 2.4 GHz signal reached 3.9 × 10<sup>-14</sup> at 1 s and 6.2 × 10<sup>-17</sup> at 10,000 s. This proposed technique could help to improve the integration of time and frequency synchronization networks using existing optical fibers.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2386-2389"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753964","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
Nanoscale isolation layer design for non-volatile integrated photonics targeting high-energy efficiency programming and computing.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.555585
Hengyu Zhang, Hui Xu, Bing Song, Qingjiang Li
{"title":"Nanoscale isolation layer design for non-volatile integrated photonics targeting high-energy efficiency programming and computing.","authors":"Hengyu Zhang, Hui Xu, Bing Song, Qingjiang Li","doi":"10.1364/OL.555585","DOIUrl":"https://doi.org/10.1364/OL.555585","url":null,"abstract":"<p><p>The revolutionary advancements in artificial intelligence have precipitated an urgent need for low-latency and energy-efficient processing systems. Photonic in-memory computing stands out as a promising solution. Here, we introduce a novel, to the best of our knowledge, design for non-volatile integrated photonic devices that significantly reduces both programming and computing energy consumption. Through introducing a nanoscale isolation layer, the programming energy is reduced by over 80<i>%</i>. The device exhibits a programming precision of 6 bits and maintains consistent performance after 1000 switching cycles. Furthermore, the isolation layer mitigates the impact of non-ideal modulation of the device, reducing the insertion loss to 0.5 dB. This improvement is expected to decrease the computing energy consumption by more than 35<i>%</i>. This study provides new insights into high-energy efficiency integrated photonic computing and contributes to the large-scale integration of photonic computing systems.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2441-2444"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753970","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-chip wavelength beam combined DFB quantum cascade laser arrays.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.558575
Tushar Sanjay Karnik, Laurent Diehl, Qingyang Du, Jia Xu Brian Sia, Christian Pflügl, Daryoosh Vakhshoori, Juejun Hu
{"title":"On-chip wavelength beam combined DFB quantum cascade laser arrays.","authors":"Tushar Sanjay Karnik, Laurent Diehl, Qingyang Du, Jia Xu Brian Sia, Christian Pflügl, Daryoosh Vakhshoori, Juejun Hu","doi":"10.1364/OL.558575","DOIUrl":"https://doi.org/10.1364/OL.558575","url":null,"abstract":"<p><p>Quantum cascade lasers (QCLs) are essential for a wide range of mid-infrared (mid-IR) applications. Achieving wavelength beam combining (WBC) of QCLs on a chip scale is highly desirable for power scaling and/or broadband emission multi-wavelength output while maintaining a single output beam. We propose a straightforward architecture that monolithically integrates five distributed feedback (DFB) QCLs with an arrayed waveguide grating (AWG), using III-V semiconductor waveguides. The AWG channel wavelengths are carefully designed to align with the corresponding DFB emissions. An amplifier is also incorporated at the output to boost the total power. After the deposition of anti-reflection coatings on the output facet, the best-performing laser element achieved a peak power of 3 W under pulsed operation, with at least 1.75 W from the other channels. These results mark a significant step toward the realization of on-chip high-power WBC QCLs.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2409-2412"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143754038","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
Tunable multi-wavelength generation of an integrated self-injection locking laser based on the Vernier effect.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.550686
Dongwei Zhuang, Quanxin Na, Qijie Xie, Li Wang, Baisong Chen, Chunyang Ma, LanXuan Zhang, Lei Wang, Li Qin, Junfeng Song
{"title":"Tunable multi-wavelength generation of an integrated self-injection locking laser based on the Vernier effect.","authors":"Dongwei Zhuang, Quanxin Na, Qijie Xie, Li Wang, Baisong Chen, Chunyang Ma, LanXuan Zhang, Lei Wang, Li Qin, Junfeng Song","doi":"10.1364/OL.550686","DOIUrl":"https://doi.org/10.1364/OL.550686","url":null,"abstract":"<p><p>A narrow-linewidth laser based on self-injection locking has found widespread applications, including wavelength division multiplexing, sensing, and LiDAR detection. Although self-injection locking can support multi-wavelength operation, conventional implementations have typically been bulky and constrained by limited wavelength spacing. In this paper, we demonstrate an integrated multi-wavelength self-injection locking (MWSIL) laser capable of generating multiple narrow-linewidth outputs with tunable spacing. Multi-wavelength operation is achieved through the Vernier effect in the injection locking of a single distributed feedback laser (DFB) to a Si<sub>3</sub>N<sub>4</sub>-based micro-resonator (MRR). In the experimental demonstration, the wavelength spacing of the laser is tunable from 1.155 nm to 9.24 nm by adjusting the phase of the cavity. The intrinsic linewidths of the multi-wavelength laser are all below 1.6 kHz, with the optimal linewidth at 125 Hz, representing up to a 703-fold improvement compared to the free-running state. Additionally, the laser exhibits mode-hop-free frequency tuning over a range of 2.6 GHz. The MWSIL laser provides an effective on-chip solution for generating a tunable, multi-wavelength optical source with ultra-narrow linewidth.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2215-2218"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143754059","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
Collective transport of particles and cells enabled by wavelength-division multiplexing in microcavity cascade optical tweezers.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.553192
Jianguo Jiang, Qizan Shi, Weida Chen, Xu Liu, Linzhi Yao, Zhaoqi Ji, Minghui Zhang, Xiufang Wang, Peng Chen, Taiji Dong, Chunlei Jiang
{"title":"Collective transport of particles and cells enabled by wavelength-division multiplexing in microcavity cascade optical tweezers.","authors":"Jianguo Jiang, Qizan Shi, Weida Chen, Xu Liu, Linzhi Yao, Zhaoqi Ji, Minghui Zhang, Xiufang Wang, Peng Chen, Taiji Dong, Chunlei Jiang","doi":"10.1364/OL.553192","DOIUrl":"https://doi.org/10.1364/OL.553192","url":null,"abstract":"<p><p>This study presents a microcavity cascade optical tweezer (MCOT) system incorporating wavelength-division multiplexing for collective transport of particles and cells in biomedical applications. The MCOT system traps and transports yeast cells (5 μm) and silica microspheres using 980 nm and 1550 nm lasers, with a maximum capacity of six particles. Under 980 nm laser illumination, capillary microflow force surpasses optical forces, stably trapping particles and cells in the microcavity. At 1550 nm, significant heat absorption excites thermophoretic forces, which, combined with optical forces, enhance particle transport. Experimental results closely match simulations, confirming the system's potential for efficient particle and cell transport, especially for drug and cell delivery applications.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2167-2170"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143754000","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
Dispersion engineering for broadband visible microcombs via mode hybridization and inverse design: publisher's note.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.561742
Zhenlin Zhao, Ruiji Dong, Ya Hu, Ming Li, Juanjuan Lu, Ziyao Feng, Xiankai Sun, Chang-Ling Zou, Qijing Lu
{"title":"Dispersion engineering for broadband visible microcombs via mode hybridization and inverse design: publisher's note.","authors":"Zhenlin Zhao, Ruiji Dong, Ya Hu, Ming Li, Juanjuan Lu, Ziyao Feng, Xiankai Sun, Chang-Ling Zou, Qijing Lu","doi":"10.1364/OL.561742","DOIUrl":"https://doi.org/10.1364/OL.561742","url":null,"abstract":"<p><p>This publisher's note contains a correction to Opt. Lett.50, 1751 (2025)10.1364/OL.555498.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2157"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753370","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
Flatband localization in 1D moiré bilayer photonic crystals with staggered potential.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.558564
Stepan M Trushin, Takahiro Ito, Yuki Ishii, Satoshi Iwamoto, Yasutomo Ota
{"title":"Flatband localization in 1D moiré bilayer photonic crystals with staggered potential.","authors":"Stepan M Trushin, Takahiro Ito, Yuki Ishii, Satoshi Iwamoto, Yasutomo Ota","doi":"10.1364/OL.558564","DOIUrl":"https://doi.org/10.1364/OL.558564","url":null,"abstract":"<p><p>Moiré photonic crystals exhibit a variety of exciting phenomena, including flatband localization. In bilayer moiré photonic crystals, activating flatband localization often requires precise tuning of various structural parameters, which may limit its experimental realization and applications. In this work, we discuss one-dimensional moiré bilayer photonic crystals with staggered potential introduced into each layer. Moiré patterns were formed by slightly differentiating the lattice periods of the top and bottom grating layers, which were double-periodically modulated for introducing the staggered potential. We found that the staggered potential helps in inducing flatband localization in a wider parameter space. We identified the magnitude of the staggered potential as a handy tuning parameter for the manipulation of photonic moiré bands and their wave functions. Our finding here will accelerate the nano-/microcavity formation through moiré physics.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2405-2408"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753775","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
Four-channel silicon nitride wavelength beam combiners for multi-gas absorption spectroscopy.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.558983
Qing Gao, Xiangeng Wang, Kan Huang, Jincheng Wei, Yanwei Huang, Yanfeng Zhang, Ruijun Wang, Siyuan Yu
{"title":"Four-channel silicon nitride wavelength beam combiners for multi-gas absorption spectroscopy.","authors":"Qing Gao, Xiangeng Wang, Kan Huang, Jincheng Wei, Yanwei Huang, Yanfeng Zhang, Ruijun Wang, Siyuan Yu","doi":"10.1364/OL.558983","DOIUrl":"https://doi.org/10.1364/OL.558983","url":null,"abstract":"<p><p>The detection and measurement of multiple trace gases based on the laser absorption spectroscopy technique requires laser sources with wavelength tunability in multiple wave bands. In this Letter, we present an on-chip wavelength beam combiner based on silicon nitride Mach-Zehnder interferometers (MZIs) and a modified multimode interferometer (MMI) structure to multiplex light with different wavelength spacings. An MZI composed of a standard 1 × 2 MMI and 2 × 2 MMI is employed to digitally multiplex two wavelengths within ∼100 nm spacing. The two wave bands with a spacing of a few hundred nanometers are multiplexed by a compact modified MMI structure. The measured insertion losses of all four channels are around 2.5 dB from the 1650 nm wave band to the 2050 nm wave band. A tunable diode laser absorption spectroscopy (TDLAS) measurement of multi-gas is demonstrated using the device as the wavelength beam combiner.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2469-2472"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753794","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
Chiral flatband in refractive index modulated metasurfaces.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.555234
Yidan Hu, Qilin Duan, Jiangbin Li, Shan Zhu, Yuhang Yin, Huanyang Chen
{"title":"Chiral flatband in refractive index modulated metasurfaces.","authors":"Yidan Hu, Qilin Duan, Jiangbin Li, Shan Zhu, Yuhang Yin, Huanyang Chen","doi":"10.1364/OL.555234","DOIUrl":"https://doi.org/10.1364/OL.555234","url":null,"abstract":"<p><p>Flatband exhibits unique properties, such as slow light effects and a high density of states; incorporating these properties into chiral metasurfaces can significantly enhance chiroptical responses across a range of incident angles. In this study, we establish a theoretical framework to analyze circular dichroism in the presence of broken mirror symmetry along the <i>z</i>-direction. Building on this framework, we employ a theoretical model based on refractive index modulation and partial etching, which lead to a metasurface with a pronounced flatband with chiroptical response. This metasurface holds significant potential for applications in chiral light source emission and detectors, chiral sensing, and enantioseparation, particularly at wide incidence angles.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2145-2148"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753995","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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