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Evaluating the coherence and time-domain profile of quantum cascade laser frequency combs: status and perspectives: publisher's note. 评估量子级联激光频率梳的相干性和时域轮廓：现状和观点：出版商的说明。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-20 DOI: 10.1364/OE.620394
David Burghoff, Yang Yang, Darren J Hayton, Jian-Rong Gao, John L Reno, Qing Hu
{"title":"Evaluating the coherence and time-domain profile of quantum cascade laser frequency combs: status and perspectives: publisher's note.","authors":"David Burghoff, Yang Yang, Darren J Hayton, Jian-Rong Gao, John L Reno, Qing Hu","doi":"10.1364/OE.620394","DOIUrl":"https://doi.org/10.1364/OE.620394","url":null,"abstract":"<p><p>This publisher's note contains a correction to [Opt. Express23(2), 1190 (2015)]. The article was corrected on 20 October 2026.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"41322-41323"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323491","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
Attosecond coherent Cherenkov radiation from a flying-focus-driven superluminal wakefield. 飞行焦点驱动的超光速尾流场的阿秒相干切伦科夫辐射。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-23 DOI: 10.1364/OE.612925
Kangnan Jiang, Jiale Zheng, Xintao Yang, Zhaoyang Li, Wentao Wang, Ruxin Li
{"title":"Attosecond coherent Cherenkov radiation from a flying-focus-driven superluminal wakefield.","authors":"Kangnan Jiang, Jiale Zheng, Xintao Yang, Zhaoyang Li, Wentao Wang, Ruxin Li","doi":"10.1364/OE.612925","DOIUrl":"https://doi.org/10.1364/OE.612925","url":null,"abstract":"<p><p>We present a scheme for attosecond coherent Cherenkov radiation from a superluminal wake driven by a flying-focus pulse. Varying the flying-focus velocity allows the wake phase velocity to cross from subluminal to superluminal, providing direct control over radiation coherence and directivity. In the superluminal regime, the divergence angle follows the Fresnel diffraction limit for a finite source, reducing from tens of milliradians to below 9 mrad. Transverse electron oscillations are found to narrow the angular spread with increasing amplitude. The plasma density serves as a key tuning parameter, leading to a superlinear growth in absolute bandwidth with density, which is expected to further expand the range of photon energy. These results lay a theoretical foundation for realizing tunable attosecond coherent light sources via the flying-focus technique.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"41888-41898"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323544","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
Cost-efficient frequency-domain scheme for forward stimulated Brillouin scattering measurements. 正激布里渊散射测量的成本效益频域方案。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-23 DOI: 10.1364/OE.605499
Raffaele Vallifuoco, Luigi Zeni, Aldo Minardo
{"title":"Cost-efficient frequency-domain scheme for forward stimulated Brillouin scattering measurements.","authors":"Raffaele Vallifuoco, Luigi Zeni, Aldo Minardo","doi":"10.1364/OE.605499","DOIUrl":"https://doi.org/10.1364/OE.605499","url":null,"abstract":"<p><p>We present a cost-efficient frequency-domain scheme for forward stimulated Brillouin scattering (FSBS) measurements in optical fibers. The proposed scheme relies on a single laser to excite and probe the transverse acoustic resonances of the fiber under test. A double sideband (DSB) modulated pump light is injected into the fiber, while the transmitted light is demodulated through a vector network analyzer after filtering out its upper (or lower) sidebands. Our experiments are corroborated by numerical simulations performed by solving the coupled equations taking both FSBS and Kerr effects into account. As a proof of concept, we tested our system with two fibers: a highly nonlinear fiber with acrylate coating for temperature characterization, and a bare standard single-mode fiber for mechanical impedance detection.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"41758-41768"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323560","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
Lateral motion of a spherical Mie particle driven by counter-propagating elliptically polarized Gaussian beams. 由反传播椭圆偏振高斯光束驱动的球形Mie粒子的横向运动。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-20 DOI: 10.1364/OE.609354
E N Bulgakov, D N Maksimov
{"title":"Lateral motion of a spherical Mie particle driven by counter-propagating elliptically polarized Gaussian beams.","authors":"E N Bulgakov, D N Maksimov","doi":"10.1364/OE.609354","DOIUrl":"https://doi.org/10.1364/OE.609354","url":null,"abstract":"<p><p>We numerically consider the lateral motion of levitated spherical Mie particles subject to the optical radiative forces induced by counter-propagating monochromatic Gaussian beams of elliptical polarization. In the spectral vicinity of the first magnetic and the first electric Mie resonances, the equilibrium point on the beam axis becomes unstable, and the particle transitions into a mode of lateral motion. It is found that, depending on the ellipticity of the beams, the lateral motion terminates at either one of the two off-axial fixed-point attractors or at a limit-cycle attractor. This effect paves the way for polarization control of the dynamics of particles captured by optical tweezers.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"41094-41100"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323571","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
Local optical feasibility maps for compound lens optimization under direct modulation transfer function constraints. 直接调制传递函数约束下复合透镜优化的局部光学可行性图。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-30 DOI: 10.1364/OE.614032
Chizhi Chris Zhang, Yi Cui, Jian Jiang, Hongwei Lou, Lei Sheng
{"title":"Local optical feasibility maps for compound lens optimization under direct modulation transfer function constraints.","authors":"Chizhi Chris Zhang, Yi Cui, Jian Jiang, Hongwei Lou, Lei Sheng","doi":"10.1364/OE.614032","DOIUrl":"https://doi.org/10.1364/OE.614032","url":null,"abstract":"<p><p>Direct modulation transfer function (MTF) constraints couple wavefront improvement to fieldwise contrast preservation. We measure a local feasibility map from paired prescription perturbations and use axial feasibility and starting contrast to select residual-corrected cone search or coordinate continuation. At 120 optical evaluations, composite wavefront error decreased by 3.35%, 14.47%, and 38.52% for double-Gauss, fisheye, and telecentric systems. Comparisons over 100-240 evaluations and with constrained linear approximation show that performance depends on system and budget. Zero-tolerance controls reduce the corresponding gains to 2.40%, 12.01%, and 0.55%, identifying the sensitivity of low contrast telecentric branch to the acceptance tolerance.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"42924-42940"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323576","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 second harmonic generation lithium niobate metasurfaces with electro-optic tunability. 具有光电可调性的高效二次谐波生成铌酸锂超表面。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-27 DOI: 10.1364/OE.610378
Yingying Yu, Jian Yang, Bo Sun
{"title":"High-efficiency second harmonic generation lithium niobate metasurfaces with electro-optic tunability.","authors":"Yingying Yu, Jian Yang, Bo Sun","doi":"10.1364/OE.610378","DOIUrl":"https://doi.org/10.1364/OE.610378","url":null,"abstract":"<p><p>High-efficiency and actively tunable second-harmonic generation (SHG) in nonlinear metasurfaces is highly desirable for integrated nonlinear photonic applications. Here, we propose an electro-optically tunable lithium niobate metasurface consisting of an array of elliptical nanopillars with air-hole tetramers. By introducing structural asymmetry, quasi-bound states in the continuum (quasi-BIC) with a high-quality factor (high-Q) are formed, manifesting as a Fano resonance dominated by strong toroidal dipole excitation and enhanced optical field confinement. These resonant characteristics significantly strengthen the nonlinear light-matter interaction, yielding an optimized absolute SHG conversion efficiency of 3.2 × 10<sup>-2</sup> under a pump intensity of 5 kW/cm<sup>2</sup> in the O-band, corresponding to a normalized conversion efficiency of 6.4 × 10<sup>-10</sup> m<sup>2</sup>/W. In addition, the electro-optic effect of lithium niobate enables dynamic modulation of both the linear transmission spectrum and the SHG response under an externally applied voltage, and the designed lithium niobate metasurface achieves a wavelength tuning efficiency of 45 pm/V. By combining high-Q quasi-BIC resonances, efficient nonlinear frequency conversion, and active electro-optic tuning within a single metasurface platform, this work offers a promising route toward reconfigurable nonlinear photonic devices with potential applications in integrated frequency conversion, optical modulation, and photonic signal processing.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"42263-42277"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323592","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
Inverse design of a fiber-to-fiber integrated metasurface system for multiplexing and demultiplexing of orbital angular momentum modes. 轨道角动量模复用与解复用光纤集成超表面系统的反设计。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-21 DOI: 10.1364/OE.617888
Jimmy D Tran, Thomas Sturges, Oliver Kuster, Markus Nyman, Kalipada Chatterjee, Leif K Oxenløwe, Carsten Rockstuhl, Toshio Morioka, Radu Malureanu, Andrei Lavrinenko
{"title":"Inverse design of a fiber-to-fiber integrated metasurface system for multiplexing and demultiplexing of orbital angular momentum modes.","authors":"Jimmy D Tran, Thomas Sturges, Oliver Kuster, Markus Nyman, Kalipada Chatterjee, Leif K Oxenløwe, Carsten Rockstuhl, Toshio Morioka, Radu Malureanu, Andrei Lavrinenko","doi":"10.1364/OE.617888","DOIUrl":"https://doi.org/10.1364/OE.617888","url":null,"abstract":"<p><p>A two-way multiplexer (MUX) and demultiplexer (DEMUX) system to separate spatially overlapping OAM modes in a multi-mode fiber into spatially separated Gaussian modes in a multi-core fiber has been designed and modelled. The designed system consists of two silicon metasurfaces. Each metasurface consists of silicon nanopillars with spatially varying radii arranged on a square grid. These metasurfaces were simulated as if they were placed on the facets of the two optical fibers under consideration, spaced at a suitable distance, face-to-face. The metasurfaces are designed using a gradient-based inverse design approach that yields an optimized spatial distribution for the radius of each nanopillar, and the functionality is verified through full-wave simulations. The system can handle a set of six OAM modes with topological charges <i>l</i> = ( ± 20, ± 30, ± 40). The average single-mode fiber-to-fiber insertion loss (IL) at 1550 nm was 8.99 dB when using the system as a MUX and 6.30 dB when used as a DEMUX, respectively. The average crosstalk was -17.8 dB in MUX operation and -17.7 dB in DEMUX operation, respectively. Our approach opens a pathway to compact and highly efficient mode-division multiplexing architectures, enabling next-generation high-capacity optical communication systems and inspiring further advances in metasurface-based fiber-interfacing technologies.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"41460-41472"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323608","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 multipath interference impairments and a FEC-aided equalization solution in IM/DD PAM4 interconnects. IM/DD - PAM4互连中多径干扰损伤及fec辅助均衡解决方案的研究。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-21 DOI: 10.1364/OE.614019
Jun Ming, Ze Dong, Shaonan Liu, Hailian He, Yujia Mu, Junyuan Song, Rui Wang, Zhipei Li, Xiangjun Xin
{"title":"Investigation of multipath interference impairments and a FEC-aided equalization solution in IM/DD PAM4 interconnects.","authors":"Jun Ming, Ze Dong, Shaonan Liu, Hailian He, Yujia Mu, Junyuan Song, Rui Wang, Zhipei Li, Xiangjun Xin","doi":"10.1364/OE.614019","DOIUrl":"https://doi.org/10.1364/OE.614019","url":null,"abstract":"<p><p>This work investigates multipath interference (MPI) impairments and proposes a forward error correction (FEC) aided MPI equalization (FAME) solution for intensity-modulation direct-detection (IM/DD) PAM4 interconnects. We comprehensively analyze the impact of laser linewidth, signal-to-interference ratio (SIR), and reflection delay on MPI generation through both theoretical models and experiments. To mitigate these impairments, a single-iteration frame is integrated by a FEC decoder and a simplified error-magnitude-dependent (EMD) equalizer. The decoded bits from the FEC decoder serve as reference symbols for the convergence of the equalizer, and the equalized symbols are fed back into the FEC decoder, establishing a closed-loop iterative process. This iterative mechanism enhances reference symbol fidelity compared to classical decision-directed schemes, effectively mitigating error propagation. Experimental validation via 60 GBaud PAM4 transmission over 2 km of standard single-mode fiber demonstrates up to 2.2 dB SIR tolerance improvement at the 2.4 × 10<sup>-4</sup> FEC threshold.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"41412-41424"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323610","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
Nonlinear pluggable optics: digital signal processing-free intensity modulated direct detection links using analog photonic next generation reservoir computing. 非线性可插拔光学：使用模拟光子下一代储层计算的数字信号处理-无强度调制直接检测链路。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-30 DOI: 10.1364/OE.608534
Nicholas Cox, Joseph Murray, Ross T Schermer, Shuo S Pang, Christopher Long, Gajadhar Joshi, Nicholas Nobile, Raktim Sarma, Brandon Redding
{"title":"Nonlinear pluggable optics: digital signal processing-free intensity modulated direct detection links using analog photonic next generation reservoir computing.","authors":"Nicholas Cox, Joseph Murray, Ross T Schermer, Shuo S Pang, Christopher Long, Gajadhar Joshi, Nicholas Nobile, Raktim Sarma, Brandon Redding","doi":"10.1364/OE.608534","DOIUrl":"https://doi.org/10.1364/OE.608534","url":null,"abstract":"<p><p>In this work, we propose and simulate a nonlinear pluggable optic (NLPO) transceiver that combines the low latency and low power consumption of linear pluggable optics (LPO) with the range and robustness of digital signal processing (DSP)-based transceivers. The proposed NLPO uses an analog photonic next-generation reservoir computing (NGRC) architecture, constructed on a photonic integrated circuit (PIC), to compensate for electrical-domain distortions and optical-channel impairments from chromatic dispersion and moderate Kerr nonlinearity. Focusing on a simulated 50 GBd PAM-4 link, we find that the NGRC-based NLPO not only extends the LPO range, but can actually outperform DSP based on industry-standard Volterra nonlinear equalizers. Our simulations reveal two key advantages compared to DSP-based Intensity modulation/direct detection (IM/DD) links: (1) the NGRC can take advantage of the optical phase information without requiring a local oscillator and (2) the NGRC can optically sample the transmitted data well above the symbol rate without requiring high-bandwidth electronics. This work showcases the potential for photonic NGRCs to outperform state-of-the-art digital solutions in real-world applications and opens a path to low-latency, lower-power IM/DD links at ranges of 10s of km.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"42789-42814"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323616","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
Overexposure-free automatic exposure algorithm for division-of-aperture polarization camera. 分光圈偏振相机无过曝自动曝光算法。
IF 3.4 2区 物理与天体物理
Optics express Pub Date : 2026-11-02 Epub Date: 2026-10-28 DOI: 10.1364/OE.608672
Zhen Meng, Feiya Ma, Dayuan Xiong, Yining Zhang, Liyong Ren
{"title":"Overexposure-free automatic exposure algorithm for division-of-aperture polarization camera.","authors":"Zhen Meng, Feiya Ma, Dayuan Xiong, Yining Zhang, Liyong Ren","doi":"10.1364/OE.608672","DOIUrl":"https://doi.org/10.1364/OE.608672","url":null,"abstract":"<p><p>This paper proposes a two-stage overexposure-free automatic exposure searching algorithm for division-of-aperture polarization (DoAP) cameras to avoid pixel-level polarization information corruption caused by overexposure. The first search determines the safe exposure upper bound to eliminate yielding overexposed pixels in the image captured by any polarization channel, ensuring the integrity of raw polarimetric data. The second search runs within this bound to maximize the mean gradient of four-channel polarized images, ensuring the imaging qualities for subsequent image registration tasks, thereby accurately acquiring polarization information. Experiments show stable, smooth exposure search, offering a robust and efficient auto-exposure scheme for DoAP imaging.</p>","PeriodicalId":19691,"journal":{"name":"Optics express","volume":"34 22","pages":"42391-42402"},"PeriodicalIF":3.4,"publicationDate":"2026-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149323625","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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