npj Nanophotonics最新文献_第4页

In-plane hyperbolic phonon polaritons: materials, properties, and nanophotonic devices 面内双曲声子极化子：材料、特性和纳米光子器件

npj Nanophotonics Pub Date : 2024-07-17 DOI: 10.1038/s44310-024-00019-4

Yunxiu Ma, Gang Zhong, Zhigao Dai, Qingdong Ou

引用次数: 0

Advances in resonator-based Kerr frequency combs with high conversion efficiencies 基于谐振器的高转换效率克尔频率梳的研究进展

npj Nanophotonics Pub Date : 2024-07-17 DOI: 10.1038/s44310-024-00030-9

Xucheng Zhang, Chunxue Wang, Zhibo Cheng, Congyu Hu, Xingchen Ji, Yikai Su

引用次数: 0

Palm vein imaging using a polarization-selective metalens with wide field-of-view and extended depth-of-field 使用具有宽视场和扩展景深的偏振选择性金属膜进行手掌静脉成像

npj Nanophotonics Pub Date : 2024-07-17 DOI: 10.1038/s44310-024-00027-4

Ying Kuang, Shuai Wang, Bincheng Mo, Shiyou Sun, Kai Xia, Yuanmu Yang

{"title":"Palm vein imaging using a polarization-selective metalens with wide field-of-view and extended depth-of-field","authors":"Ying Kuang, Shuai Wang, Bincheng Mo, Shiyou Sun, Kai Xia, Yuanmu Yang","doi":"10.1038/s44310-024-00027-4","DOIUrl":"10.1038/s44310-024-00027-4","url":null,"abstract":"Metalens is a flat, lightweight optical element that may replace traditional bulky refractive lenses and other components in imaging systems. However, a number of critical challenges still remain for most metalenses demonstrated to date, including limited field-of-view (FOV), depth-of-field (DOF), and working bandwidth, which restrict their use in a real-world application. Here, we propose and experimentally demonstrate a compact imaging system equipped with a metalens that simultaneously features a wide FOV of 140° and an extended DOF ranging from 33 to 150 mm. The metalens further allows polarization selectivity, which can be used to remove unwanted surface reflection of the target scene. Using a narrowband vertical-cavity surface-emitting laser for illumination, we show that the system is well-suited for near-infrared palm vein imaging, an emerging modality for biometric identification. The metalens-integrated imaging system provides uncompromised performance with a greatly simplified form factor compared to a traditional system, which may also be adopted for other applications such as depth sensing and endoscopy.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00027-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Silicon photonics for high-speed communications and photonic signal processing 用于高速通信和光子信号处理的硅光子学

npj Nanophotonics Pub Date : 2024-07-17 DOI: 10.1038/s44310-024-00024-7

Xuetong Zhou, Dan Yi, David W. U Chan, Hon Ki Tsang

{"title":"Silicon photonics for high-speed communications and photonic signal processing","authors":"Xuetong Zhou, Dan Yi, David W. U Chan, Hon Ki Tsang","doi":"10.1038/s44310-024-00024-7","DOIUrl":"10.1038/s44310-024-00024-7","url":null,"abstract":"Leveraging on the mature processing infrastructure of silicon microelectronics, silicon photonic integrated circuits may be readily scaled to large volume production for low-cost high-volume applications such as optical transceivers for data centers. Driven by the rapid growth of generative artificial intelligence and the resultant rapid increase in data traffic in data centers, new integrated optical transceivers will be needed to support multichannel high-capacity communications beyond 1.6Tb/s. In this paper, we review some of the recent advances in high performance optical waveguide grating couplers (WGC) as a key enabling technology for future high capacity communications. We describe the novel use of shifted-polysilicon overlay gratings on top of the silicon grating that enabled foundry manufactured chips to have fiber-chip coupling losses of under 1 dB. The use of mirror symmetry and resonant cavity enhancement in the design of gratings can increase the 1-dB optical bandwidths of grating couplers to over 100 nm. Multimode waveguide grating couplers (MWGC) may be designed for the selective launch of different modes channels in multimode fibers for mode-division-multiplexing (MDM) communications. The use of different modes or polarizations in optical fibers for high capacity communications requires the unscrambling of data lanes which are mixed together during the optical fiber transmission. We describe how silicon photonic circuits can be used to perform unitary matrix operations and unscramble the different data lanes in multichannel optical communication systems. We also describe recent advances on high-speed silicon modulators for enabling data rates of individual data lanes in an integrated optical transceiver beyond 300 Gb/s.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-14"},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00024-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advanced optical polarizers based on 2D materials 基于二维材料的先进光学偏振器

npj Nanophotonics Pub Date : 2024-07-17 DOI: 10.1038/s44310-024-00028-3

Yuning Zhang, Jiayang Wu, Linnan Jia, Di Jin, Baohua Jia, Xiaoyong Hu, David Moss, Qihuang Gong

{"title":"Advanced optical polarizers based on 2D materials","authors":"Yuning Zhang, Jiayang Wu, Linnan Jia, Di Jin, Baohua Jia, Xiaoyong Hu, David Moss, Qihuang Gong","doi":"10.1038/s44310-024-00028-3","DOIUrl":"10.1038/s44310-024-00028-3","url":null,"abstract":"Optical polarizers are essential components for the selection and manipulation of light polarization states in optical systems. Over the past decade, the rapid advancement of photonic technologies and devices has led to the development of a range of novel optical polarizers, opening avenues for many breakthroughs and expanding applications across diverse fields. Particularly, two-dimensional (2D) materials, known for their atomic thin film structures and unique optical properties, have become attractive for implementing optical polarizers with high performance and new features that were not achievable before. This paper reviews recent progress in 2D-material-based optical polarizers. First, an overview of key properties of various 2D materials for realizing optical polarizers is provided. Next, the state-of-the-art optical polarizers based on 2D materials, which are categorized into spatial-light devices, fiber devices, and integrated waveguide devices, are reviewed and compared. Finally, we discuss the current challenges of this field as well as the exciting opportunities for future technological advances.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-17"},"PeriodicalIF":0.0,"publicationDate":"2024-07-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00028-3.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141730381","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cavity-enhanced narrowband spectral filters using rare-earth ions doped in thin-film lithium niobate 使用掺杂在铌酸锂薄膜中的稀土离子的空穴增强型窄带光谱滤波器

npj Nanophotonics Pub Date : 2024-07-02 DOI: 10.1038/s44310-024-00023-8

Yuqi Zhao, Dylan Renaud, Demitry Farfurnik, Yuxi Jiang, Subhojit Dutta, Neil Sinclair, Marko Lončar, Edo Waks

{"title":"Cavity-enhanced narrowband spectral filters using rare-earth ions doped in thin-film lithium niobate","authors":"Yuqi Zhao, Dylan Renaud, Demitry Farfurnik, Yuxi Jiang, Subhojit Dutta, Neil Sinclair, Marko Lončar, Edo Waks","doi":"10.1038/s44310-024-00023-8","DOIUrl":"10.1038/s44310-024-00023-8","url":null,"abstract":"On-chip optical filters are fundamental components in optical signal processing. While rare-earth ion-doped crystals offer ultra-narrow optical filtering via spectral hole burning, their applications have primarily been limited to those using bulk crystals, restricting their utility. In this work, we demonstrate cavity-enhanced spectral filtering based on rare-earth ions in an integrated nonlinear optical platform. We incorporate rare-earth ions into high quality-factor ring resonators patterned in thin-film lithium niobate. By spectral hole burning at 4 K in a critically coupled resonance mode, we achieve bandpass filters ranging from 7 MHz linewidth, with 13.0 dB of extinction, to 24 MHz linewidth, with 20.4 dB of extinction. By reducing the temperature to 100 mK to eliminate phonon broadening, we achieve an even narrower linewidth of 681 kHz, which is comparable to the narrowest filter linewidth demonstrated in an integrated photonic device, while only requiring a small device footprint. Moreover, the cavity enables reconfigurable filtering by varying the cavity coupling rate. For instance, as opposed to the bandpass filter, we demonstrate a bandstop filter utilizing an under-coupled ring resonator. Such versatile integrated spectral filters with high extinction ratio and narrow linewidth could serve as fundamental components for optical signal processing and optical memories on-a-chip.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-11"},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00023-8.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Observation of the liquid metal phase transition in optofluidic microcavities 观测光流体微腔中的液态金属相变

npj Nanophotonics Pub Date : 2024-07-02 DOI: 10.1038/s44310-024-00022-9

Zixiang Fu, Zhenlin Zhao, Ruiji Dong, Junqiang Guo, Yan-Lei Zhang, Shusen Xie, Xianzeng Zhang, Qijing Lu

{"title":"Observation of the liquid metal phase transition in optofluidic microcavities","authors":"Zixiang Fu, Zhenlin Zhao, Ruiji Dong, Junqiang Guo, Yan-Lei Zhang, Shusen Xie, Xianzeng Zhang, Qijing Lu","doi":"10.1038/s44310-024-00022-9","DOIUrl":"10.1038/s44310-024-00022-9","url":null,"abstract":"Gallium (Ga) exhibits remarkable potential in flexible electronics, chemistry, and biomedicine due to its exceptional physical properties. The phase transition and supercooling characteristics of Ga have led to the emergence of numerous valuable applications. In this paper, we capitalize on this foundation by utilizing optofluidic microcavities supporting both high quality factor optical and optomechanical modes to investigate the phase transformation process and supercooling properties of Ga. Our study provides comprehensive insights into the dynamic behavior of Ga during the complete phase transition, such as measuring a hysteresis loop between the solid-to-liquid and liquid-to-solid transitions, revealing nonreciprocal resonance wavelength shift, and identifying a unique metastability state of Ga during melting. The linear thermal expansion coefficients of Ga were precisely measured to be 0.41 × 10−5 K−1 and −0.75 × 10−5 K−1 for solid and liquid Ga, respectively. Our research provides a comprehensive and versatile monitoring platform for newly fabricated liquid metal alloys, offering multidimensional insights into their phase transition behavior.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00022-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500515","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Classifying topology in photonic crystal slabs with radiative environments 对具有辐射环境的光子晶体板中的拓扑结构进行分类

npj Nanophotonics Pub Date : 2024-07-02 DOI: 10.1038/s44310-024-00021-w

Stephan Wong, Terry A. Loring, Alexander Cerjan

{"title":"Classifying topology in photonic crystal slabs with radiative environments","authors":"Stephan Wong, Terry A. Loring, Alexander Cerjan","doi":"10.1038/s44310-024-00021-w","DOIUrl":"10.1038/s44310-024-00021-w","url":null,"abstract":"In the recent years, photonic Chern materials have attracted substantial interest as they feature topological edge states that are robust against disorder, promising to realize defect-agnostic integrated photonic crystal slab devices. However, the out-of-plane radiative losses in those photonic Chern slabs has been previously neglected, yielding limited accuracy for predictions of these systems’ topological protection. Here, we develop a general framework for measuring the topological protection in photonic systems, such as in photonic crystal slabs, while accounting for in-plane and out-of-plane radiative losses. Our approach relies on the spectral localizer that combines the position and Hamiltonian matrices of the system to draw a real-picture of the system’s topology. This operator-based approach to topology allows us to use an effective Hamiltonian directly derived from the full-wave Maxwell equations after discretization via finite-elements method (FEM), resulting in the full account of all the system’s physical processes. As the spectral FEM-localizer is constructed solely from FEM discretization of the system’s master equation, the proposed framework is applicable to any physical system and is compatible with commonly used FEM software. Moving forward, we anticipate the generality of the method to aid in the topological classification of a broad range of complex physical systems.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2024-07-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00021-w.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141500526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Semiconductor core fibres: a scalable platform for nonlinear photonics 半导体芯光纤：非线性光子学的可扩展平台

npj Nanophotonics Pub Date : 2024-07-02 DOI: 10.1038/s44310-024-00026-5

Meng Huang, John Ballato, Anna C. Peacock

引用次数: 0

Intersubband polaritonic metasurfaces for high-contrast ultra-fast power limiting and optical switching 用于高对比度超快功率限制和光开关的带内偏振元表面

npj Nanophotonics Pub Date : 2024-07-01 DOI: 10.1038/s44310-024-00016-7

Michele Cotrufo, Jonas H. Krakofsky, Sander A. Mann, Gerhard Boehm, Mikhail A. Belkin, Andrea Alù

{"title":"Intersubband polaritonic metasurfaces for high-contrast ultra-fast power limiting and optical switching","authors":"Michele Cotrufo, Jonas H. Krakofsky, Sander A. Mann, Gerhard Boehm, Mikhail A. Belkin, Andrea Alù","doi":"10.1038/s44310-024-00016-7","DOIUrl":"10.1038/s44310-024-00016-7","url":null,"abstract":"Nonlinear intersubband polaritonic metasurfaces support one of the strongest known ultrafast nonlinear responses in the mid-infrared frequency range across all condensed matter systems. Beyond harmonic generation and frequency mixing, these nonlinearities can be leveraged for ultrafast optical switching and power limiting, based on tailored transitions from strong to weak polaritonic coupling. Here, we demonstrate synergistic optimization of materials and photonic nanostructures to achieve large reflection contrast in ultrafast polaritonic metasurface limiters. The devices are based on optimized semiconductor heterostructure materials that minimize the intersubband transition linewidth and reduce absorption in optically-saturated nanoresonators, achieving a record-high reflection contrast of 54% experimentally. We also discuss opportunities to further boost the metrics of performance of this class of ultrafast limiters, showing that reflection contrast as high as 94% may be realistically achieved using all-dielectric intersubband polaritonic metasurfaces.","PeriodicalId":501711,"journal":{"name":"npj Nanophotonics","volume":" ","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2024-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.nature.com/articles/s44310-024-00016-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141489088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0