{"title":"Design of Large‐Aperture Hybrid Refractive Metalens System","authors":"Yinpeng Ma,Huachao Cheng,Shijie Wei,Ben Xue,Xihang Yang,Tengfei Wu,Yue Wang,Ruixiang Yang,Qingqing Guo,Teli Xi","doi":"10.1002/nap2.70301","DOIUrl":"https://doi.org/10.1002/nap2.70301","url":null,"abstract":"ABSTRACT Metalenses flexibly control wavefronts in compact systems, but large‐aperture broadband imaging remains challenging because phase compensation increases rapidly and full‐wave simulations are computationally prohibitive. We propose a wavefront‐constrained joint optimization framework for large‐aperture hybrid refractive metalens imaging systems. The method couples ray tracing of the refractive lens, angular spectrum propagation of the metalens‐modulated field, and manufacturable meta‐atom phase mapping, enabling system‐level optimization of the hybrid optical path without full‐aperture full‐wave modeling. The refractive lens provides the primary focusing power; the metalens introduces an optimized continuous phase profile to compensate residual aberrations and reduce broadband image‐plane wavefront errors. Here, we design and fabricate a 40‐mm‐aperture, F/2 hybrid refractive metalens system operating over the 7.7–9.5 μm long‐wave infrared (LWIR) band. Compared with the single refractive lens baseline, the optimized hybrid design reduces the root‐mean‐square (RMS) wavefront error and peak‐to‐valley (PV) value by 44% and 37%. The fabricated system achieves modulation transfer function (MTF) values higher than 0.2 at the detector Nyquist frequency. A frequency‐aware neural reconstruction module suppresses residual blur and noise. These results demonstrate that the method provides a practical route to scaling refractive–metalens optics toward large‐aperture, compact, and broadband infrared imaging systems.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"167 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149020619","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}
{"title":"Triple Space‐Polarization On–Off‐Key Modulation With AlN‐Based Tri‐Focal Metalens","authors":"Zhi‐Yan Lin,Chen‐Yi Tsai,Bo‐Yi Chen,Huang‐Yu Wei,Hsiao‐Hsuan Yang,Yuh‐Jen Cheng,Hideto Miyake,Chia‐Yen Huang","doi":"10.1002/nap2.70266","DOIUrl":"https://doi.org/10.1002/nap2.70266","url":null,"abstract":"ABSTRACT We designed and demonstrated a tri‐focal metalens (TF‐lens) made of high‐temperature‐annealed AlN (HT‐AlN) on sapphire. The HTA‐AlN film possesses an ultrawide bandgap ( E g = 6.2 eV), atomic‐level smoothness, and single‐crystalline quality, making it an exceptional candidate for a metasurface in visible spectral wavelengths. By incorporating polarization‐insensitive zone‐plate null rings into a polarization‐selective bifocal metalens, the incident light will be focused into two or three foci on the focal plane, each with a distinct polarization state. The extinction ratio between the on and off peaks exceeds 1000 after subtracting the background signal, and the absolute value of S 3 is measured to be higher than 0.96 at the side foci. By manipulating the incident polarization state and the angle of the linear analyzer behind the TF‐lens, all combinations of the on–off keying at three distinct foci can be generated.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"266 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149020615","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}
{"title":"Multi‐Objective Inverse Design of a Dual‐Narrowband Thermal Emitter for Optical Gas Sensing","authors":"Xiaowen Li,Zilin Zhang,Jiazheng Tang,Sheng Liu,Jie Sheng,Qionghui Chang,Xuyang Zhang,Yuchuan Shao,Zhengji Wen,Feng Liu","doi":"10.1002/nap2.70295","DOIUrl":"https://doi.org/10.1002/nap2.70295","url":null,"abstract":"ABSTRACT Spectrally selective narrowband thermal emitters with high‐temperature stability are critical infrared sources for advanced gas sensing. However, conventional Tamm‐plasmon narrowband thermal emitters are commonly implemented as distributed Bragg reflectors on thin metal layers, which can restrict spectral tunability and complementary metal–oxide–semiconductor (CMOS) compatibility. Here, we propose a cost‐effective, CMOS‐compatible, lithography‐free, wafer‐scale aperiodic dual‐narrowband thermal emitter. Optimized via a multi‐objective inverse design framework, the emitter consists of an aperiodic Si/SiO 2 dielectric multilayer deposited on a TiN refractory conductive ceramic film. Experimental results demonstrate that the fabricated sample exhibits two selective emission peaks at 3.26 and 6.30 μm, matching the characteristic absorption bands of CH 4 and NO 2 , respectively. In addition, the emitter maintains its dual‐narrowband spectral response after heating to 693 K. In practical gas‐sensing tests, the dual‐narrowband emitter achieved 12.2‐ and 13.5‐fold improvements in relative sensitivity for CH 4 and NO 2 detection, respectively, compared with a conventional broadband blackbody source. This work provides a scalable refractory infrared source for spectrally selective optical gas sensing.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"54 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149020617","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}
{"title":"Second‐Harmonic Generation Enhancement in Polar Dielectric Films via Nonlocal Longitudinal Modes and Berreman Modes","authors":"Yining Yao,Ye Zhang,Jie Luo,Dongliang Gao,Hao Hu,Lei Gao","doi":"10.1002/nap2.70298","DOIUrl":"https://doi.org/10.1002/nap2.70298","url":null,"abstract":"ABSTRACT Polar dielectrics offer considerable promise for mid‐infrared nanophotonics and nonlinear optics because of their low optical losses and spectral bands of negative permittivity. However, previous studies have generally shown that nonlocal effects in polar dielectrics lead to suppression effects. This work reveals a different phenomenon, whereby we utilize the nonlocal effect to achieve second‐harmonic generation (SHG) enhancement in polar dielectric films. Specifically, the longitudinal‐mode resonances in polar dielectrics introduce multiple longitudinal resonances. We combine the nonlocal longitudinal mode at the fundamental frequency with the Berreman mode at the second‐harmonic frequency, achieving simultaneous resonance of the fundamental and second‐harmonic waves, thereby significantly enhancing the intensity of SHG. Numerical results show that the second‐harmonic intensity in the nonlocal case can be hundreds of times higher than that in the local case. Our study indicates that nonlocality‐enhanced SHG provides a promising platform for the application of polar dielectric crystals in nonlinear nanophotonics.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"192 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-09-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149020618","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}
NanophotonicsPub Date : 2026-09-14DOI: 10.1002/nap2.70235
José N. Gama,Diogo Cunha,Carla Estévez-Varela,Marina García-Pardo,Pablo Pedreira,Adelaide Miranda,M. Carmen López-González,Pieter A. A. De Beule,Eduardo Solano,Rosalia Serna,Mikhail Vasilevskiy,Martin Lopez-Garcia,Isabel Pastoriza-Santos,Sara Núñez-Sánchez
{"title":"Hyperbolic Surface Exciton Polaritons and Surface Waves in Near-Zero Permittivity Regions Supported by Artificial Organic Hyperbolic Metamaterials","authors":"José N. Gama,Diogo Cunha,Carla Estévez-Varela,Marina García-Pardo,Pablo Pedreira,Adelaide Miranda,M. Carmen López-González,Pieter A. A. De Beule,Eduardo Solano,Rosalia Serna,Mikhail Vasilevskiy,Martin Lopez-Garcia,Isabel Pastoriza-Santos,Sara Núñez-Sánchez","doi":"10.1002/nap2.70235","DOIUrl":"https://doi.org/10.1002/nap2.70235","url":null,"abstract":"A fully organic route to artificial hyperbolic metamaterials is introduced, utilizing multilayered thin films of J-aggregate dyes. These structures exhibit strong optical anisotropy, experimentally supporting hyperbolic surface exciton polaritons and surface waves in near-zero Permittivity regions. This architecture provides a robust platform for tailoring emission and energy transport, enabling the exploration of light–matter interactions at the subwavelength regime.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"35 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-09-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148964477","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}
{"title":"Silicon Photonic Beam Steerer Based on Metalens Focal Plane Array","authors":"Chung‐Yu Hsu,Ping‐Yen Hsieh,Hsun‐Sung Chiu,Li‐Jun Tung,Chieh‐Chih Yu,Ko‐Chi Chen,Yu‐Heng Hong,Hao‐Chung Kuo,Chi‐Wai Chow,You‐Chia Chang","doi":"10.1002/nap2.70274","DOIUrl":"https://doi.org/10.1002/nap2.70274","url":null,"abstract":"ABSTRACT Focal plane arrays (FPAs) promise robust solid‐state beam steering for LiDAR and free‐space optical communications. However, the need for external collimation lenses hinders chip‐scale compactness. Discrete switching between FPA elements further introduces blind spots and limits the number of resolvable points, restricting applications that require continuous tracking. Here, we demonstrate a silicon photonic beam steerer based on a metalens FPA that monolithically integrates the collimation lens on‐chip. Thermo‐optic prisms enable continuous fine‐tuning, eliminating blind spots and doubling the number of resolvable points. Continuous steering over a 62° field of view is achieved while maintaining high beam quality, with an average sidelobe suppression ratio of 19 dB.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"54 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148923647","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}
{"title":"Integrated Sensing and Communication in a Fiber‐Wireless System With Time‐Phase Synthesis Dimension Waveform","authors":"Shengkun Chen,Zhenglin Tang,Weiqiang Lyu,Mengke Wang,Yaowen Zhang,Zhen Zeng,Lingjie Zhang,Heping Li,Zhiyao Zhang,Yong Liu","doi":"10.1002/nap2.70290","DOIUrl":"https://doi.org/10.1002/nap2.70290","url":null,"abstract":"ABSTRACT The convergence of integrated sensing and communication (ISAC) across optical and wireless domains is a cornerstone for next‐generation networks, yet it is hindered by the fundamental incompatibility between fiber and wireless systems. Here, we introduce a unified fiber‐wireless ISAC system driven by a single microwave photonic platform. By leveraging a tailored time‐phase synthesis dimension waveform, our architecture simultaneously delivers high‐speed data transmission, precise wireless ranging, and accurate fiber diagnostics. The system achieves an equivalent common public radio interface (CPRI) data rate of 47.92 Gbit/s, a wireless ranging resolution of 0.29 m, and a fiber delay measurement precision of 56.6 ps capable of breakpoint localization. Furthermore, the synthesized waveform suppresses stimulated Brillouin scattering by 11 dB in high‐power analog fronthaul, paving the way for compact and energy‐efficient base stations. This work provides scalable and power‐efficient framework that bridges the long‐standing gap between optical and wireless realms, setting the stage for future green and intelligent mobile networks.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"376 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148923646","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}
NanophotonicsPub Date : 2026-09-08DOI: 10.1002/nap2.70291
Junghyeon Kim,Sumin Bark,Minjae Lee,Sungjoon Lim
{"title":"Low‐Complexity Phase–Transition‐Based VO\u0000 2\u0000 Transmissive Reconfigurable Intelligent Surface for Indoor Millimeter‐Wave Communications","authors":"Junghyeon Kim,Sumin Bark,Minjae Lee,Sungjoon Lim","doi":"10.1002/nap2.70291","DOIUrl":"https://doi.org/10.1002/nap2.70291","url":null,"abstract":"ABSTRACT This paper presents a low‐complexity and low‐cost transmissive reconfigurable intelligent surface (TRIS) based on the phase‐change material vanadium dioxide (VO 2 ) for indoor millimeter‐wave (mm‐wave) communications. Although mm‐wave systems enable ultra‐high data rates and low latency, their performance is limited by severe path loss and non‐line‐of‐sight propagation. RISs offer a promising solution by dynamically controlling electromagnetic wave propagation. In particular, TRISs provide greater deployment flexibility than reflective RISs in indoor environments where transmitter–receiver links are blocked by walls, windows, or other barriers. However, wide phase tunability in TRISs typically requires complex circuit architectures. Moreover, conventional active components such as PIN and varactor diodes suffer from significant parasitic effects at mm‐wave frequencies, which degrade performance and increase design complexity. To address these limitations, the proposed TRIS exploits the metal–insulator phase transition of VO 2 and geometrically engineered VO 2 switch patterns to achieve flexible phase reconfiguration without complex biasing networks or lossy lumped components. The design is validated through theoretical analysis, full‐wave simulations, and measurements. The prototype steers transmitted waves from 0° to ± 20° at 65 GHz and achieves up to approximately 15 dB transmission enhancement between the programmed and reference states across 64–66 GHz, demonstrating its potential for indoor mm‐wave and WiGig applications.","PeriodicalId":19027,"journal":{"name":"Nanophotonics","volume":"6 1","pages":""},"PeriodicalIF":7.5,"publicationDate":"2026-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148923648","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}