OpticaPub Date : 2026-07-09DOI: 10.1364/optica.578977
Jie Liu, Zelin Ma, Junyi Liu, Jiakai Dong, Haolin Zhou, Shuqi Mo, Lixun Wu, Suqing Li, Yujie Chen, Leslie Rusch, Sophie Larochelle, Siddharth Ramachandran, and Siyuan Yu
{"title":"Optical fiber communications using orbital angular momentum modes","authors":"Jie Liu, Zelin Ma, Junyi Liu, Jiakai Dong, Haolin Zhou, Shuqi Mo, Lixun Wu, Suqing Li, Yujie Chen, Leslie Rusch, Sophie Larochelle, Siddharth Ramachandran, and Siyuan Yu","doi":"10.1364/optica.578977","DOIUrl":"https://doi.org/10.1364/optica.578977","url":null,"abstract":"This paper presents a comprehensive review of the research efforts in harnessing orbital angular momentum (OAM) modes for space-division multiplexed (SDM) optical fiber communications, including both multi-core and mode-division approaches. With their inherent characteristics of rotational invariance, modal intensity uniformity, and manageable modal degeneracy, OAM modes uniquely enable ultra-high-capacity transmission while significantly mitigating inter-channel crosstalk and simplifying system architecture. Underpinned by these advantages, remarkable progress has been made across the critical components of OAM-based systems: advanced fibers supporting high-density low-crosstalk propagation of high-order OAM modes across distances of tens to hundreds of kilometers, high-performance scalable multiplexers and demultiplexers, and optical amplifiers with equalized modal gain. Collectively, these innovations have promoted OAM-based SDM systems to a technological level characterized by petabit-per-second capacities and ultra-high spectral efficiencies, longer transmission reaches, with low and manageable MIMO processing complexity. Together, they position OAM technology as a transformative solution to the capacity bottlenecks of conventional single-mode fibers, paving the way for the next generation of high-density, energy-efficient optical networks.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"22 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401699","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
OpticaPub Date : 2026-07-09DOI: 10.1364/optica.577541
Hyunseok Oh, Viraj Dharod, Carl Padgett, Lillian B. Hughes Wyatt, Jayameenakshi Venkatraman, Shreyas Parthasarathy, Ekaterina Osipova, Ian Hedgepeth, Jeffrey V. Cady, Luca Basso, Yongqiang Wang, Michael Titze, Edward S. Bielejec, Andrew M. Mounce, Dirk Bouwmeester, and Ania C. Bleszynski Jayich
{"title":"Spin-embedded diamond optomechanical resonator with a mechanical quality factor exceeding one million","authors":"Hyunseok Oh, Viraj Dharod, Carl Padgett, Lillian B. Hughes Wyatt, Jayameenakshi Venkatraman, Shreyas Parthasarathy, Ekaterina Osipova, Ian Hedgepeth, Jeffrey V. Cady, Luca Basso, Yongqiang Wang, Michael Titze, Edward S. Bielejec, Andrew M. Mounce, Dirk Bouwmeester, and Ania C. Bleszynski Jayich","doi":"10.1364/optica.577541","DOIUrl":"https://doi.org/10.1364/optica.577541","url":null,"abstract":"Diamond optomechanical crystal (OMC) devices with embedded color center spins are promising platforms for a broad range of applications in quantum sensing, networking, and computing, offering an interface between a GHz-frequency mechanical mode and both optical photons and coherent spins. A crucial but elusive step toward realizing this platform is to engineer a device with a high-quality factor mechanical mode while preserving the bulk-like coherence of embedded spins. Here, we demonstrate sideband-resolved diamond OMCs with mechanical quality factors in excess of \u0000 at cryogenic temperatures and find coherence times up to \u0000µ\u0000 for embedded nitrogen-vacancy (NV) centers. Furthermore, we measure these devices across five orders of magnitude in intracavity optical power, demonstrating robust power handling and a high optomechanical cooperativity ( \u0000) at cryogenic temperatures, which is essential for a broad range of quantum protocols requiring strong, coherent interactions between photons and phonons. These results are enabled by a robust, high-throughput method for forming single-crystal diamond membranes in combination with chemical vapor deposition (CVD) diamond overgrowth with nitrogen \u0000-doping. We discuss the prospects of this platform for hybrid spin-mechanical devices in the quantum regime.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"37 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
OpticaPub Date : 2026-07-09DOI: 10.1364/optica.585766
Rongzhou Chen, Chutian Wang, Yuxing Li, Yuqing Cao, Shuo Zhu, and Edmund Y. Lam
{"title":"Self-calibrated neuromorphic hyperspectral derivative imaging","authors":"Rongzhou Chen, Chutian Wang, Yuxing Li, Yuqing Cao, Shuo Zhu, and Edmund Y. Lam","doi":"10.1364/optica.585766","DOIUrl":"https://doi.org/10.1364/optica.585766","url":null,"abstract":"Hyperspectral imaging provides rich spectral-spatial contrast, but conventional systems are often limited by cost, acquisition speed, and dynamic range. We present OpenHI, a low-cost event-based hyperspectral imager that uses an event camera during spectral scanning to capture spectral-derivative frames with respect to the wavelength of the scene’s log-transmittance, achieving microsecond latency and high dynamic range. To address distortions from non-constant scan velocity, including acceleration-induced temporal shear, we apply a multi-window warping model for compensation. The system also automatically recovers scan timing and performs time-wavelength alignment. We compare reconstructed spectral slices with a reference hyperspectral camera under low-light conditions and demonstrate an open, low-cost hardware–firmware–software pipeline that makes neuromorphic hyperspectral imaging more accessible.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"59 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401598","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
OpticaPub Date : 2026-07-09DOI: 10.1364/optica.578380
Jinxian Guo, Meihong Wang, Zeliang Wu, Chenyu Qiao, Fengyi Xu, Xiaoran Zhang, Xiaolong Su, Liqing Chen, and Weiping Zhang
{"title":"Full-bandwidth quantum memory of squeezed light","authors":"Jinxian Guo, Meihong Wang, Zeliang Wu, Chenyu Qiao, Fengyi Xu, Xiaoran Zhang, Xiaolong Su, Liqing Chen, and Weiping Zhang","doi":"10.1364/optica.578380","DOIUrl":"https://doi.org/10.1364/optica.578380","url":null,"abstract":"Achieving high end-to-end efficiency and broadband quantum memory of squeezed light is crucial for continuous-variable quantum information processing. Existing demonstrations fail to store squeezed states across their full squeezing bandwidth. Here, we present a full-bandwidth quantum memory of squeezed light with up to 24 MHz bandwidth, which is at least 12 times that of previous narrowband resonant memory systems, via a far-off resonant Raman process. We achieve output squeezing as high as \u0000dB\u0000, with fidelity above \u0000 and a memory efficiency of 80%, corresponding to an end-to-end efficiency of \u0000 when input squeezing is \u0000dB\u0000. The lowest excess noise of 0.025 shot-noise unit in the memory system is estimated by the noisy model, which benefits from optimizing quantum memory performance with a backward-retrieval strategy. Our results show high-performance memory for squeezed states within tens of MHz-level bandwidth, which has potential applications in high-speed quantum information processing.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"12 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
OpticaPub Date : 2026-07-09DOI: 10.1364/optica.588968
Yanqun Wang, Furong Zhong, Lin Liu, Yuntao Zhu, Jinyi Wang, Zhongjin Lin, and Xinlun Cai
{"title":"Precise and robust domain engineering based on the Faraday cage effect for thin-film lithium niobate photonics","authors":"Yanqun Wang, Furong Zhong, Lin Liu, Yuntao Zhu, Jinyi Wang, Zhongjin Lin, and Xinlun Cai","doi":"10.1364/optica.588968","DOIUrl":"https://doi.org/10.1364/optica.588968","url":null,"abstract":"Thin-film lithium niobate (TFLN) waveguides are promising for efficient second-harmonic generation (SHG) owing to their strong optical confinement and large second-order nonlinearity. However, robust fabrication of high-efficiency devices remains challenging, as existing domain engineering methods lack precise and robust controls of polarity distributions. Here, we propose and demonstrate a domain engineering technique that utilizes nanoscale Faraday cages to shape the electric-field distributions during poling, physically defining polarity distribution by the geometry of the Faraday cages without real-time monitoring. As a proof of concept, the method is used to fabricate a spatially selectively poled TFLN waveguide, where all regions are poled except for a 400 nm wide central strip. This waveguide achieves a normalized SHG efficiency of \u0000W\u0000cm\u0000. Systematic investigation of the inverted domain growth dynamics confirms the enhanced precision and robustness of this approach over conventional time-controlled methods, paving the way for scalable nonlinear photonic circuits.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"24 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401610","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
OpticaPub Date : 2026-07-09DOI: 10.1364/optica.585973
Diego Piciocchi, Ina Heckelmann, Alexander Dikopoltsev, Michael Schreiber, Mathieu Bertrand, Mattias Beck, Christian Jirauschek, Oded Zilberberg, and Jérôme Faist
{"title":"Noise-driven localization of collective light in an active synthetic lattice","authors":"Diego Piciocchi, Ina Heckelmann, Alexander Dikopoltsev, Michael Schreiber, Mathieu Bertrand, Mattias Beck, Christian Jirauschek, Oded Zilberberg, and Jérôme Faist","doi":"10.1364/optica.585973","DOIUrl":"https://doi.org/10.1364/optica.585973","url":null,"abstract":"Noise plays an important role in nonlinear dynamics, giving rise to complex behaviors. While remarkable control over collective multimode states of light has been achieved in nonlinear optical systems driven out of equilibrium, the effect of noise injected through the drive remains understudied. By introducing temporal noise into the modulation of the laser cavity, we create a fluctuating potential along a synthetic frequency lattice formed by the laser modes. As the noise strength increases, the laser emission evolves through three distinct regimes: a broad spectrum, a Gaussian distribution, and finally exponential localization. Time-resolved spectroscopy reveals that transport across the synthetic lattice persists in the Gaussian regime, where it is shaped by the fluctuating potential, but becomes fully suppressed in the localized regime. Our results demonstrate that temporal noise can induce localization in a nonlinear synthetic photonic system, opening new possibilities, to our knowledge, for controlling the dynamics and spectral properties of multimode lasers through engineered modulations.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"78 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401621","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
OpticaPub Date : 2026-07-09DOI: 10.1364/optica.582198
Murat Yessenov, Luca Sacchi, Alfonso Palmieri, Layton A. Hall, Ayman F. Abouraddy, and Federico Capasso
{"title":"Observation of the spatially structured Montgomery effect in free space","authors":"Murat Yessenov, Luca Sacchi, Alfonso Palmieri, Layton A. Hall, Ayman F. Abouraddy, and Federico Capasso","doi":"10.1364/optica.582198","DOIUrl":"https://doi.org/10.1364/optica.582198","url":null,"abstract":"Talbot effect is a lens-less self-imaging phenomenon with a wide range of applications in optics. A lesser-known yet potentially more versatile Montgomery effect generalizes self-imaging to aperiodic structures. We report the first, to our knowledge, direct observation of the spatially structured Montgomery effect in free space. Using a dynamic optical hologram to discretize radial spatial frequencies, we demonstrate self-imaging at distances ranging from 30 to 100 mm. Our method independently controls the focal spot size and self-imaging period, enabling dynamic three-dimensional light patterns. We also show the arbitrary tunability of the transverse profile by demonstrating revivals of Laguerre–Gaussian, Hermite–Gaussian, Ince–Gaussian modes, and Airy beams. These findings open opportunities for multi-plane microscopy, optical atom traps, and quantum atomic systems.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"23 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
OpticaPub Date : 2026-07-09DOI: 10.1364/optica.583778
Aarón A. Aguilar-Cardoso, Cheng Li, Tobey J. B. Luck, Manuel F. Ferrer-Garcia, Jeremy Upham, Jeff S. Lundeen, and Robert W. Boyd
{"title":"All-optical turbulence mitigation for free-space quantum key distribution using stimulated parametric down-conversion","authors":"Aarón A. Aguilar-Cardoso, Cheng Li, Tobey J. B. Luck, Manuel F. Ferrer-Garcia, Jeremy Upham, Jeff S. Lundeen, and Robert W. Boyd","doi":"10.1364/optica.583778","DOIUrl":"https://doi.org/10.1364/optica.583778","url":null,"abstract":"Free-space quantum communications offers a promising route for securely transmitting information over long distances. However, a major challenge for these systems is atmospheric turbulence, which distorts the spatial structure of light and can severely limit the amount of information that can be reliably transmitted. In this work, we propose and demonstrate a turbulence-resilient scheme for free-space quantum communication. By leveraging the phase conjugation property of stimulated parametric down-conversion, our scheme enables all-optical dynamic correction of spatial-mode distortion induced by atmospheric turbulence, thereby enhancing the secure key rate in high-dimensional quantum key distribution. We develop a theoretical model that provides detailed guidelines for selecting the optimal basis and spatial properties needed to maximize the efficiency of the proposed scheme. Both numerical simulations and experimental results show that, even under strong turbulence, our scheme can reduce the quantum error rates well below the security threshold. These results highlight the potential of nonlinear optical approaches as powerful tools for robust quantum communication in realistic free-space environments.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"6 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401661","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
{"title":"Extending q-plates to spatiotemporal vectorial topological pulse shaping","authors":"Nianjia Zhang, Qian Cao, Vagharshak Hakobyan, Etienne Brasselet, and Qiwen Zhan","doi":"10.1364/optica.588383","DOIUrl":"https://doi.org/10.1364/optica.588383","url":null,"abstract":"Spatially structured light has enabled advanced topological and vectorial control, while spatiotemporal manipulation has so far remained largely restricted to scalar phase engineering. Here, we introduce a geometric-phase method for shaping spatiotemporal vectorial beams using q-plates of arbitrary topological charge. We develop an analytical framework describing the polarization-controlled generation of vector beams and polarization skyrmions in the space-time or momentum-time domain and experimentally validate it using an electrically tunable liquid-crystal q-plate. Our results establish q-plates as compact and reconfigurable platforms for vectorial topological shaping of ultrashort pulses, opening directions in spatiotemporal photonics.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"117 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401662","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}
OpticaPub Date : 2026-07-09DOI: 10.1364/optica.577676
Qianyi Wu, Jie Hu, Hongki Lee, Junxiang Zhao, Ming Lei, and Zhaowei Liu
{"title":"Snapshot parallel refractive index tomography","authors":"Qianyi Wu, Jie Hu, Hongki Lee, Junxiang Zhao, Ming Lei, and Zhaowei Liu","doi":"10.1364/optica.577676","DOIUrl":"https://doi.org/10.1364/optica.577676","url":null,"abstract":"Phase Imaging enables label-free visualization of transparent biological samples, offering critical insight into cellular structure and transient dynamics with minimal phototoxicity. However, existing three-dimensional (3D) phase imaging techniques typically require sequential scanning or interferometric setups, limiting temporal resolution and increasing system complexity. To overcome these challenges, we propose snapshot parallel refractive index tomography (SPRIT), a snapshot, 3D refractive index (RI) imaging technique. SPRIT employs a diffractive optical element to capture multifocal intensity images. The volumetric RI distribution is reconstructed by deconvolving the intensity measurement with the 3D transfer functions of the system. By incorporating partially coherent illumination, SPRIT achieves higher spatial resolution than coherent imaging systems, with the degree of enhancement governed by the illumination and detection numerical apertures. We demonstrate volumetric imaging of live Chilomonas at 50 Hz with SPRIT, showcasing its ability to resolve fine subcellular structures in real-time. With its snapshot, high-resolution capabilities, SPRIT offers a powerful tool for label-free 3D imaging in cellular biology and medical diagnostics.","PeriodicalId":19515,"journal":{"name":"Optica","volume":"14 1","pages":""},"PeriodicalIF":10.4,"publicationDate":"2026-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148401667","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"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}