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An exponential curved crystal: design and performance for high-resolution X-ray spectroscopy. 指数曲线晶体:高分辨率x射线光谱的设计和性能。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.579731
Jixin Yang, Jun Shi, Weixia Hu, Miao Li, Shali Xiao, Ruize Wang, Qichao Luo

Based on the principles of Bragg diffraction and the Rowland circle geometry, we developed a novel, to the best of our knowledge, curved-crystal spectrometer featuring an exponentially shaped surface. This design facilitates high resolution and high photon collection efficiency over a broad energy range. Crucially, all image points for various X-ray energies lie precisely on the Rowland circle, and the lines connecting these image points to the source point are collinear. The spectrometer achieved a spectral resolution exceeding 18,000 in theoretical and simulation studies, which remained above 3,100 under experimental validation. This innovative and adaptable design offered promising potential for applications in plasma diagnostics and high-energy-density physics research.

基于布拉格衍射和罗兰圆几何原理,我们开发了一种新型的,据我们所知,具有指数形状表面的曲线晶体光谱仪。这种设计有助于在宽能量范围内实现高分辨率和高光子收集效率。至关重要的是,各种x射线能量的所有图像点都精确地位于罗兰圆上,并且将这些图像点与源点连接的线是共线的。该光谱仪在理论和模拟研究中实现了超过18000的光谱分辨率,在实验验证中保持在3100以上。这种创新和适应性强的设计为等离子体诊断和高能量密度物理研究提供了广阔的应用前景。
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引用次数: 0
Co-integration of mesoporous GaN distributed Bragg reflectors and light-emitting diodes by transfer printing. 介孔氮化镓分布布拉格反射器与发光二极管的转移印刷协整。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.584532
Benoit Guilhabert, Miles Toon, Saptarsi Ghosh, Dimitars Jevtics, Zhongyi Xia, Menno Kappers, Martin D Dawson, Rachel A Oliver, Michael J Strain

Transfer printing is employed to demonstrate the integration of gallium nitride (GaN)-based distributed Bragg reflectors (DBR) with 100 μm lateral dimensions and reflectance of 90% in various formats. Mesoporous GaN DBRs are utilized as basic building blocks to fabricate more complex photonic devices directly on Silicon (Si) and glass receiving substrates. Multi-mode optical resonant cavities centered at 450 nm on Si are thus formed by direct stacking of two mesoporous DBR membranes. Furthermore, active devices are also demonstrated by combining mesoporous DBR with GaN-based light-emitting diodes membranes of similar dimensions, resulting in a Fabry-Perot-mediated emission with its main peak shifted by 14 nm compared to a reference device without DBR. Measured optical bandwidth of 136 MHz (-6 dB) in a small signal modulation scheme is also demonstrated from these devices.

利用转移印花技术,研究了横向尺寸为100 μm、反射率为90%的氮化镓(GaN)分布式布拉格反射器(DBR)的集成。介孔GaN dbr被用作直接在硅(Si)和玻璃接收基板上制造更复杂的光子器件的基本构建块。因此,通过直接堆叠两个介孔DBR膜,在Si上形成了以450 nm为中心的多模光学谐振腔。此外,通过将介孔DBR与相似尺寸的gan基发光二极管膜结合,有源器件也得到了证明,与没有DBR的参考器件相比,其主峰位移了14 nm的fabry - perot介导发射。在小信号调制方案下测量的光带宽为136mhz (- 6db)。
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引用次数: 0
Deep learning-assisted double strong coupling between multi-order anapoles and excitons. 深度学习辅助的多阶模拟极点与激子之间的双强耦合。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.584009
Ziqiao Liu, Yang Liao, Yuan Liu, Hanyang Gong, Zhengqi Liu, Jing Chen, Xianping Wang, Yanliang He, Xiaoshan Liu, Juan Chen, Guiqiang Liu

High-order anapoles present strongly concentrated energy and narrow resonance widths and thus become burgeoning candidates in nonlinear optical conversion and strong coupling fields. Nevertheless, existing studies are rarely focused on strong coupling simultaneously involving multi-order anapoles. Herein, we theoretically construct a three-layer stacked hybrid system with a Si nanodisk sandwiched by the MoSe2 and MoTe2 nanodisks with the same radius based on the neural network constructed by deep learning (DL). First-order and second-order anapoles are excited simultaneously in this system and couple with excitons of bulk MoTe2 and MoSe2 nanodisks, respectively. Double strong coupling behaviors are achieved between the first-order anapole and the exciton of MoTe2 , as well as the second-order anapole and the exciton of MoSe2, resulting in four energy branches with large Rabi splitting of 100.6 meV and 118.2 meV, respectively. Our work provides an effective approach for light-matter interaction involving multi-order anapoles and multiple excitons.

高阶模拟孔径具有能量高度集中和共振宽度窄的特点,成为非线性光转换和强耦合领域中新兴的候选器件。然而,现有的研究很少关注涉及多阶模拟的强耦合。本文基于深度学习(DL)构建的神经网络,从理论上构建了一个由半径相同的MoSe2和MoTe2纳米片夹在Si纳米片中间的三层堆叠混合系统。在该系统中,一阶和二阶模拟极点同时被激发,并分别与大块MoTe2和MoSe2纳米盘的激子耦合。MoTe2的一阶反激子与激子之间以及MoSe2的二阶反激子与激子之间实现了双重强耦合行为,产生了4个大Rabi分裂的能量分支,分别为100.6 meV和118.2 meV。我们的工作提供了一种有效的方法来研究涉及多阶模拟极点和多激子的光-物质相互作用。
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引用次数: 0
Compact on-chip spectrometer with high spectral channel density using cascaded filters. 紧凑的片上光谱仪与高光谱通道密度使用级联滤波器。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.584724
Yiming Zhang, Zimeng Zhang, Bijuan Chen, Yingping Zhao, Xiong Zheng, Ke Xu

Chip-scale spectrometers play important roles in spectroscopy applications. Existing on-chip components face fundamental challenges for achieving compact footprints and large number of spectral channels. We propose and demonstrate an ultra-compact computational spectrometer on a silicon-on-insulator platform. The device cascades eight micro-ring resonators and a waveguide Bragg grating for spectral filtering. The device occupies compact chip area with a single heater for thermo-tuning. A spectral resolution of 0.17 nm and an operating bandwidth of 60 nm are experimentally achieved. It corresponds to a high spectral-channel-to-footprint ratio of 88000 ch/mm2, providing a possible solution for a highly integrated spectrometer.

芯片级光谱仪在光谱学应用中占有重要地位。现有的片上元件面临着实现紧凑封装和大量频谱通道的基本挑战。我们在绝缘体上的硅平台上提出并演示了一种超紧凑的计算光谱仪。该装置级联八个微环谐振器和一个波导布拉格光栅用于光谱滤波。该器件占用紧凑的芯片面积,只有一个加热器用于热调谐。实验获得了0.17 nm的光谱分辨率和60 nm的工作带宽。它对应于88000 ch/mm2的高光谱通道/足迹比,为高度集成的光谱仪提供了可能的解决方案。
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引用次数: 0
Efficient generation of quantum light using bound states in the continuum in silicon-nanowire slow-light waveguides. 利用硅纳米线慢光波导中连续体中的束缚态高效产生量子光。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.583797
Runzhi Cao, Tianjiao Sun, Chong Sheng, Tianyu Zhang, Jiaxuan Zhou, Shining Zhu, Hui Liu

On-chip quantum light sources are a fundamental component of integrated photonic quantum information systems. However, their performance is fundamentally limited by weak nonlinear interactions and high propagation losses, which hinder efficient generation. Here, we propose a fishbone-modulated grating structure on a silicon-nanowire waveguide to significantly enhance spontaneous four-wave mixing. The proposed structure achieves a quantum-light generation efficiency two orders of magnitude higher than conventional silicon-nanowire waveguides. Specifically, we exploit a Su-Schrieffer-Heeger-like topological interface to slow light in the waveguide, thereby enhancing the nonlinear coefficient. Moreover, we leverage the principles of bound states in the continuum to optimize the modulated gratings on the waveguide, achieving ultra-low waveguide propagation loss. The simultaneous realization of the slow-wave effect and ultralow loss effectively enhances the spontaneous four-wave mixing process in silicon. Our approach opens new possibilities for designing enhanced nonlinear nanophotonic devices using various nonlinear optical materials.

片上量子光源是集成光子量子信息系统的基本组成部分。然而,它们的性能从根本上受到弱非线性相互作用和高传播损耗的限制,从而阻碍了高效的生成。在这里,我们提出了一种鱼骨调制光栅结构在硅纳米线波导显著增强自发四波混频。该结构的量子光产生效率比传统的硅纳米线波导高出两个数量级。具体来说,我们利用类似su - schrieffer - heeger的拓扑界面来减缓波导中的光,从而提高非线性系数。此外,我们利用连续介质中的束缚态原理来优化波导上的调制光栅,实现了超低的波导传播损耗。同时实现慢波效应和超低损耗,有效地增强了硅中自发的四波混频过程。我们的方法为使用各种非线性光学材料设计增强型非线性纳米光子器件开辟了新的可能性。
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引用次数: 0
Frequency-dependent electromagnetic beam manipulation with dual-polarized wideband metagrating at an extreme-angle incidence. 频率相关的电磁波束操纵与双极化宽带偏转在极端角度入射角。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.584379
Shaojie Wang, Jing Ning, Qi Hu, Junming Zhao, Tian Jiang, Ke Chen, Yijun Feng

Recent advances in optical diffraction metagratings provide unprecedented opportunities for controlling large-angle wave scattering in photonics and spectroscopy. However, current metagrating mostly suffer from limitations on the polarization and bandwidth for extreme-angle wavefront transformation, remaining as a basic obstacle for developing metagrating devices for energy control in different polarization and frequency channels. Utilizing the orthogonally embedded grating method, a dual-polarized metagrating beam deflector is reported for high-efficiency scattering manipulation over a wide band. Exemplary cases of electromagnetic retroreflection and frequency-dependent beam scanning with a large angular range at an extreme-angle incidence are implemented at microwave frequencies. Due to the attractive features of simple geometry, extreme wavefront transformation, and dual polarization, the proposed metagratings offer possibilities for polarization and frequency division multiplexing wireless communications, remote sensing, etc.

近年来光学衍射介聚光的研究进展为控制光子学和光谱学中的大角度波散射提供了前所未有的机会。然而,目前的超聚光多受极端角波前变换的极化和带宽的限制,仍然是开发用于不同极化和频率通道能量控制的超聚光器件的基本障碍。利用正交嵌入光栅的方法,设计了一种双偏振偏聚光光束偏转器,实现了宽波段的高效率散射控制。在微波频率下实现了在极角入射角下具有大角范围的电磁反向反射和频率相关波束扫描的示例案例。由于其简单的几何形状、极端的波前变换和双极化等吸引人的特点,所提出的超聚合器为极化和频分复用无线通信、遥感等提供了可能性。
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引用次数: 0
Enhanced spectral-domain phase microscopy for high-sensitivity and broad-range quantitative phase imaging via joint algorithm-hardware calibration. 增强型光谱域相位显微镜,通过联合算法-硬件校准实现高灵敏度和大范围定量相位成像。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.585468
Jiayi Wang, Liuhang Zhao, Runnan Zhang, Zihao Zhou, Wei Yin, Xin Yuan, Ning Zhou, Chao Zuo

Spectral-domain phase microscopy (SDPM) enables high-sensitivity quantitative phase imaging by retrieving phase information directly from the interference spectrum, mitigating the axial-resolution penalty caused by spectral leakage in the discrete Fourier transform (DFT). However, conventional SDPM remains highly sensitive to abrupt phase gradients and noise, often leading to wrap mismatches and global bias that restrict its measurement range. In this Letter, we propose enhanced SDPM (eSDPM), an algorithm-hardware co-calibration framework that achieves high precision, bias-free phase reconstruction over an extended measurement range. On the algorithmic side, we explicitly model endpoint terms in the spectral phase, estimate a reference phase within a safe operating band, and determine a wavenumber anchor from the centroid of the source spectrum. On the hardware side, controlled spectral truncation and boundary-wavelength calibration minimize endpoint bias and wavelength misalignment. Experiments on biological and industrial samples demonstrate that eSDPM achieves continuous, bias-free, and high-accuracy optical path difference reconstruction over a broad measurement range, establishing it as a robust and practical approach for wide-range quantitative phase imaging.

光谱域相位显微镜(SDPM)通过直接从干涉光谱中检索相位信息,实现了高灵敏度的定量相位成像,减轻了离散傅立叶变换(DFT)中频谱泄漏造成的轴向分辨率损失。然而,传统的SDPM仍然对突变相位梯度和噪声高度敏感,经常导致包裹不匹配和全局偏差,限制了其测量范围。在这封信中,我们提出了增强型SDPM (eSDPM),这是一种算法-硬件协同校准框架,可在扩展的测量范围内实现高精度,无偏置相位重建。在算法方面,我们明确地模拟了光谱相位中的端点项,估计了安全工作频带内的参考相位,并从源光谱的质心确定了波数锚点。在硬件方面,可控的光谱截断和边界波长校准可以最大限度地减少端点偏差和波长错位。生物和工业样品的实验表明,eSDPM在宽测量范围内实现了连续,无偏置和高精度的光程差重建,使其成为大范围定量相位成像的稳健实用方法。
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引用次数: 0
Manipulation of the orbital angular momentum of soft X-ray beams by consecutive diffractive optics. 连续衍射光学对软x射线光束轨道角动量的操纵。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.584139
Nazir Khan, Rahul Jangid, Taras Stanislavchuk, Aaron Stein, Oleg Chubar, Andi Barbour, Andrei Sirenko, Valery Kiryukhin, Claudio Mazzoli

Production and manipulation of orbital angular momentum (OAM) of coherent soft X-ray beams is demonstrated utilizing consecutive diffractive optics. OAM addition is observed upon passing the beam through consecutive fork gratings. The OAM of the beam was found to be decoupled from its spin angular momentum (SAM). Practical implementation of angular momentum control by consecutive devices in the X-ray regime opens new experimental opportunities, such as direct measurement of the beam's OAM without resorting to phase-sensitive techniques, including holography. OAM analyzers utilizing fork gratings can be used to characterize the beams produced by synchrotron and free electron lasers sources; they can also be used in scattering experiments.

利用连续衍射光学演示了相干软x射线光束的轨道角动量的产生和操纵。在光束通过连续叉形光栅时观察到OAM的添加。发现光束的OAM与其自旋角动量(SAM)解耦。在x射线环境中,通过连续装置实现角动量控制的实际实施,开辟了新的实验机会,例如直接测量光束的OAM,而无需求助于相位敏感技术,包括全息术。利用叉形光栅的OAM分析仪可用于表征同步加速器和自由电子激光源产生的光束;它们也可用于散射实验。
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引用次数: 0
Probing beam coherence via terahertz metasurface. 通过太赫兹超表面探测光束相干性。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.589788
Manish Kala, Lavi Kumar Vaswani, Anuraj Panwar, Gagan Kumar, Akhilesh Kumar Mishra

Motivated by the recent advancements in terahertz metaoptics, this work investigates a metasurface capable of probing the spatial coherence of incident THz beams. Traditionally, periodic boundary conditions are applied to simulate metasurface responses under coherent illumination, whereas under incoherent illumination, both the simulation and the experiment become more complex and challenging. In this study, we employ an angular spectrum averaging technique derived from the Van Cittert-Zernike theorem, which relates the wavevector distribution of the incident beam to the spatial coherence width. The experimental measurements show good agreement with the simulation results. Additionally, we demonstrate that the depth of the metasurface transmission dip increases with decreasing spatial coherence width. Further, on the application end, we briefly discussed a metasurface-based spatial low-pass filter. The designed THz metasurface has potential applications in THz imaging, spatial filtering, and improving the signal-to-noise ratio in optical communication.

由于太赫兹元光学技术的最新进展,本研究研究了一种能够探测入射太赫兹光束空间相干性的超表面。传统上采用周期边界条件来模拟相干光照下的超表面响应,而在非相干光照下,模拟和实验都变得更加复杂和具有挑战性。在本研究中,我们采用了由Van Cittert-Zernike定理衍生的角谱平均技术,该技术将入射光束的波矢量分布与空间相干宽度联系起来。实验测量结果与仿真结果吻合较好。此外,我们还证明了超表面透射倾角的深度随着空间相干宽度的减小而增加。此外,在应用端,我们简要讨论了基于超表面的空间低通滤波器。所设计的太赫兹超表面在太赫兹成像、空间滤波和提高光通信的信噪比等方面具有潜在的应用前景。
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引用次数: 0
PRISM: a peak region identification and signature mapping method based on laser-induced spectroscopy-acoustics fusion for metal corrosion discrimination. PRISM:一种基于激光诱导光谱-声学融合的金属腐蚀识别峰区识别和特征映射方法。
IF 3.3 2区 物理与天体物理 Q2 OPTICS Pub Date : 2026-02-15 DOI: 10.1364/OL.585954
Wenkang Sun, Wenhan Gao, Yu Zhang, Dongdong Deng, Tianzhuang Wu, Boyuan Han, Junjie Li, Ziwei Wang, Yuzhu Liu

To overcome the single-modal limitations of Laser-Induced Breakdown Spectroscopy (LIBS) for identifying diverse metal corrosion types in industrial settings, we introduce a multi-modal approach by incorporating acoustic signals, termed Laser-Induced Spectroscopy-Acoustics. We propose a novel, to the best of our knowledge, dimensionality reduction method, the Peak Region Identification and Signature Mapping Algorithm (PRISM), tailored to extract features from the characteristic peaks of both the optical spectra and acoustic signals. A Random Forest (RF) model trained with PRISM-extracted features achieved a classification accuracy of 96.67%, outperforming four other machine learning methods. Feature contributions were evaluated using SHapley Additive exPlanations (SHAP). Our work demonstrates that this multimodal fusion significantly enhances classification performance and has great potential for industrial applications.

为了克服激光诱导击穿光谱(LIBS)识别工业环境中不同金属腐蚀类型的单模态局限性,我们引入了一种多模态方法,通过结合声学信号,称为激光诱导光谱-声学。我们提出了一种新颖的降维方法,即峰区识别和特征映射算法(PRISM),该方法可以从光谱和声信号的特征峰中提取特征。使用prism提取的特征训练的随机森林(Random Forest, RF)模型的分类准确率达到96.67%,优于其他四种机器学习方法。使用SHapley加性解释(SHAP)评估特征贡献。我们的工作表明,这种多模态融合显著提高了分类性能,具有巨大的工业应用潜力。
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引用次数: 0
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Optics letters
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