Optics letters最新文献_第4页

Sub-mW low-latency silicon thermo-optic phase shifter using a foundry substrate undercut heater. 亚毫瓦低延迟硅热光移相器，采用铸造衬底下切加热器。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-30 DOI: 10.1364/OL.614924

Noor Afsary, Shubham Mishra, Vishal Saxena

{"title":"Sub-mW low-latency silicon thermo-optic phase shifter using a foundry substrate undercut heater.","authors":"Noor Afsary, Shubham Mishra, Vishal Saxena","doi":"10.1364/OL.614924","DOIUrl":"https://doi.org/10.1364/OL.614924","url":null,"abstract":"We demonstrate a compact, foundry-compatible silicon thermo-optic phase shifter (TOPS) based on a substrate-undercut doped-silicon heater, achieving a π-phase-shift power of P π =0.74 mW at a drive voltage of only V π =0.91 V. Prior low-power phase shifters reach comparable or lower P π only by extending the heated length, enlarging the footprint, and none report CMOS-compatible drive voltages. Here, both the heater and the 2×2 multimode interference (MMI) couplers are optimized using particle swarm optimization (PSO), the former to jointly minimize P π and optical loss at a fixed 100 µm length in a compact 240×73 µm2 footprint. Integrated into a Mach-Zehnder switch, the device shows an insertion loss of 0.90 dB, an extinction ratio of 23 dB, and rise/fall times of 1.38/1.02 ms. To our knowledge, this is the first foundry-fabricated TOPS to combine sub-milliwatt P π , a compact low-latency arm, and a sub-1-V CMOS-compatible V π , offering a scalable route to low-energy programmable silicon photonic meshes.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 20","pages":"5818-5821"},"PeriodicalIF":3.3,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149228428","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

Low-parasitic-resistance and fabrication-tolerant silicon microring modulators operating beyond 100 GHz. 工作频率超过100ghz的低抗寄生和耐加工硅微环调制器。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-22 DOI: 10.1364/OL.614071

Yuxiang Yin, Kaihang Lu, Hao Chen, Baohua Wen, Xianyi Feng, YiHao Jian, Xuting Fan, King Hung Chiu, Yeyu Tong

{"title":"Low-parasitic-resistance and fabrication-tolerant silicon microring modulators operating beyond 100 GHz.","authors":"Yuxiang Yin, Kaihang Lu, Hao Chen, Baohua Wen, Xianyi Feng, YiHao Jian, Xuting Fan, King Hung Chiu, Yeyu Tong","doi":"10.1364/OL.614071","DOIUrl":"https://doi.org/10.1364/OL.614071","url":null,"abstract":"Silicon microring modulators (MRMs) are promising for compact, energy-efficient optical interconnects, yet their electro-optic bandwidth is constrained by the RC time constant, and their resonance wavelength is highly susceptible to fabrication variations. In this work, we present a carrier-depletion MRM that mitigates these issues by integrating an adiabatic transition with a widened low-parasitic-resistance region. The design extends the low-resistance cross-section over 61% of the cavity circumference, reducing the junction series resistance to 36.9 ohms, which is 35.9% lower than conventional designs. Across eight dies, the resonance wavelength spread is reduced from 3.58 to 1.07 nm. The modulator exhibits a measured 3-dB electro-optic bandwidth exceeding 100 GHz over a bias range of -1 to -5 V. It supports 144 Gbps NRZ and 224 Gbps PAM-4, with the latter demonstrating a bit error rate below the 7% hard-decision forward-error-correction threshold. Moreover, the device can operate in a self-bias mode at 0 V bias, achieving 128 Gbps NRZ with an estimated energy consumption of 0.861 fJ/bit, while depletion-mode operation consumes 8.878 fJ/bit.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 20","pages":"5798-5801"},"PeriodicalIF":3.3,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149228430","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

Wideband photonic subsampling up to 110 GHz at a 1-GHz sampling rate using a thin-film lithium niobate modulator. 使用薄膜铌酸锂调制器，以1ghz的采样率进行高达110ghz的宽带光子子采样。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-24 DOI: 10.1364/OL.608760

Fujian Yu, Ke Yin, Wei Dong, Tao Zhang, Guoning Zhang, Ziyang Zhu, Xiangai Cheng, Tian Jiang

{"title":"Wideband photonic subsampling up to 110 GHz at a 1-GHz sampling rate using a thin-film lithium niobate modulator.","authors":"Fujian Yu, Ke Yin, Wei Dong, Tao Zhang, Guoning Zhang, Ziyang Zhu, Xiangai Cheng, Tian Jiang","doi":"10.1364/OL.608760","DOIUrl":"https://doi.org/10.1364/OL.608760","url":null,"abstract":"The expansion of wireless communications toward carrier frequencies beyond 70 GHz confronts conventional superheterodyne receivers with fundamental challenges, particularly the performance degradation of high-frequency local oscillators (LOs) and mixers. Microwave photonics offers a promising solution for high-frequency signal processing by leveraging the intrinsic bandwidth and low timing jitter of optical devices. In this Letter, we present a photonic subsampling receiver that combines a femtosecond mode-locked laser (MLL) with a repetition rate of approximately 1 GHz and a thin-film lithium niobate (TFLN) modulator with a bandwidth of 110 GHz. Through photonic frequency mixing, optoelectronic conversion, and low-pass filtering, carriers up to 110 GHz are down-converted to a single 0-500 MHz intermediate frequency (IF) band. A commercial low-bandwidth analog-to-digital converter (ADC) then performs the digitization. The system achieves an effective number of bits (ENOB) of 4.1 at 109.99 GHz, with a timing jitter of 6.4 fs. Spurious suppression exceeds 30 dB across the entire measured band without any hardware reconfiguration. This architecture eliminates high-frequency electronic components, offering a potential front-end solution for future millimeter-wave communications.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 20","pages":"5649-5652"},"PeriodicalIF":3.3,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149228437","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

Image-free ghost edge detection at ultra-low sampling rates via a Vision Mamba network. 通过视觉曼巴网络超低采样率的无图像鬼边缘检测。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-25 DOI: 10.1364/OL.611712

Lin Cui, Qinggai Mi, Junwen Fang, Linjie Lyu, Haojin Li, Yu Hu, Tengfei Wu, Rui Wang

{"title":"Image-free ghost edge detection at ultra-low sampling rates via a Vision Mamba network.","authors":"Lin Cui, Qinggai Mi, Junwen Fang, Linjie Lyu, Haojin Li, Yu Hu, Tengfei Wu, Rui Wang","doi":"10.1364/OL.611712","DOIUrl":"https://doi.org/10.1364/OL.611712","url":null,"abstract":"Edge detection is essential for extracting structural boundaries in visual scenes, but conventional deep-learning-based methods remain sensitive to degradations in the input images and involve redundant full-image acquisition. Image-free ghost edge detection provides an efficient alternative by directly extracting edge information from bucket measurements, yet existing methods still require relatively high sampling rates to obtain reliable edge maps. Here, using a Vision Mamba network within the ghost edge detection framework, we achieve image-free edge detection directly from bucket measurements at ultra-low sampling rates. By employing joint optimization of illumination patterns and network parameters, the proposed method achieves reliable edge extraction at a sampling rate as low as 0.39%, as demonstrated by both simulations and optical experiments. Furthermore, the demonstrated robustness to measurement noise and qualitative edge-recovery results for selected visually distinct targets indicate the potential of the proposed method under challenging measurement conditions. We envision this image-free ghost edge-detection framework as a prospective platform for efficient task-oriented imaging under severe measurement constraints.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 20","pages":"5874-5877"},"PeriodicalIF":3.3,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149228388","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

Physics-driven self-supervised learning for parasitic-fringe suppression in lensless holography. 无透镜全息术中寄生条纹抑制的物理驱动自监督学习。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-14 DOI: 10.1364/OL.609229

Huailong Jing, Meng Shan, Wenhui Zhou, Chunjie Zhai, Zhaolou Cao

引用次数: 0

Minimalist single-atom geometric metasurface for far-field amplitude and polarization manipulation. 用于远场振幅和偏振操纵的极简单原子几何超表面。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-17 DOI: 10.1364/OL.608257

Shurui Zhang, Kai Pan, Qingming Zhou, Peiyang Li, Bingxue Zhang, Yuqi Zhang, Dong Li, Dandan Wen

{"title":"Minimalist single-atom geometric metasurface for far-field amplitude and polarization manipulation.","authors":"Shurui Zhang, Kai Pan, Qingming Zhou, Peiyang Li, Bingxue Zhang, Yuqi Zhang, Dong Li, Dandan Wen","doi":"10.1364/OL.608257","DOIUrl":"https://doi.org/10.1364/OL.608257","url":null,"abstract":"Metasurfaces offer a compact platform for subwavelength control of multidimensional optical fields, making them promising for high-fidelity vectorial light-field reconstruction. Existing approaches typically address this requirement by introducing additional degrees of freedom, either through nanostructures of varying dimensions or through supercell-based multiplexing. However, using nanostructures with different dimensions can increase fabrication complexity, while supercell-based implementations may introduce unwanted diffraction orders. Here, we present a single-atom geometric metasurface for independent far-field control of amplitude and polarization. The modulation is realized with a modified Gerchberg-Saxton algorithm that optimizes amplitude and polarization using a phase-only hologram. By exploiting the centrosymmetric geometric phase response, the left- and right-handed circularly polarized components are independently encoded and coherently superposed in a selected region, enabling vectorial light fields with arbitrary intensity and polarization distributions. This compact strategy provides a general route toward polarization-encoded encryption, structured light beam generation, and optical data storage.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 20","pages":"5685-5688"},"PeriodicalIF":3.3,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149228410","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

Holographic display étendue expansion with a binary π-metasurface. 用二元π-超表面进行全息显示。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-04 DOI: 10.1364/OL.613712

Congli Wang, Zhihao Zhou, Ethan Tseng, Victor Chu, Wei Ting Chen, Johannes E Fröch, Arka Majumdar, Felix Heide

引用次数: 0

Efficient broadband normal-incidence grating coupler on a lithium niobate-silicon nitride platform. 铌酸锂-氮化硅平台上的高效宽带正入射光栅耦合器。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-21 DOI: 10.1364/OL.613227

Chengkai Jiang, Zhilin Ye, Jiachang Liang, Yue Hu, Xinyu Zhang, Kaiyan Pan, Min Guo, Yunfei Niu, Gang Zhao, Shining Zhu, Xiaopeng Hu

引用次数: 0

Low-complexity subcarrier-grouping scheme for adaptive resource allocation in multi-user OFDM-NOMA VLC systems. 多用户OFDM-NOMA VLC系统中自适应资源分配的低复杂度子载波分组方案。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-25 DOI: 10.1364/OL.605060

Geyang Wang, Chengju Hu, Lian-Kuan Chen, Jian Zhao

引用次数: 0

Photon pair generation via direct and cascaded processes in a thin second-order nonlinear film. 二阶非线性薄膜中直接和级联过程产生光子对。

IF 3.3 2区物理与天体物理

Optics letters Pub Date : 2026-10-15 Epub Date: 2026-09-17 DOI: 10.1364/OL.611869

Changjin Son, Maria Chekhova

{"title":"Photon pair generation via direct and cascaded processes in a thin second-order nonlinear film.","authors":"Changjin Son, Maria Chekhova","doi":"10.1364/OL.611869","DOIUrl":"https://doi.org/10.1364/OL.611869","url":null,"abstract":"Pairs of entangled photons are crucial for photonic quantum technologies. The demand for integrability and multi-functionality suggests \"flat\" platforms-ultrathin layers and metasurfaces-as sources of photon pairs. With the success in demonstrating spontaneous parametric down-conversion (SPDC) from such sources, an alternative process to generate photon pairs, spontaneous four-wave mixing (SFWM), also attracts interest. In materials with nonzero second-order nonlinear susceptibility χ(2), SFWM can generate photon pairs both directly, through the third-order nonlinear susceptibility χ(3), and in a cascaded way, through second harmonic generation (SHG) followed by SPDC. Usually, the cascaded process is more efficient. Here, we show that in a thin layer, direct SFWM is likely to dominate, because the wavevector mismatch for SFWM is much smaller than for SHG or SPDC. To demonstrate this, we implement photon pair generation via SFWM in a second-order nonlinear material-a thin layer of lithium niobate (LN). The existence of both second- and third-order nonlinear processes offers broader opportunities for quantum state engineering.","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"51 20","pages":"5741-5744"},"PeriodicalIF":3.3,"publicationDate":"2026-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149228447","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