Spin-orbit-locked hyperbolic polariton vortices carrying reconfigurable topological charges  

作　　者：Mingsong Wang Guangwei Hu Saroj Chand Michele Cotrufo Yohannes Abate Kenji Watanabe Takashi Taniguchi Gabriele Grosso Cheng‑Wei Qiu Andrea Alù 

机构地区：[1]Photonics Initiative,Advanced Science Research Center,City University of New York,New York City,NY 10031,USA [2]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 116083,Singapore [3]Department of Physics and Astronomy,The University of Georgia,Athens,GA 30602,USA [4]Research Center for Functional Materials,National Institute for Materials Science,Tsukuba,Ibaraki 305‑0044,Japan [5]International Center for Materials Nanoarchitectonics,National Institute for Materials Science,Tsukuba,Ibaraki 305‑0044,Japan [6]Physics Program,Graduate Center,City University of New York,New York,NY 10016,USA

出　　处：《eLight》2022年第1期143-153,共11页e光学（英文）

基　　金：Office of Naval Research(Grant No.N00014-19-1-2011);Vannevar Bush Faculty Fellowship,Air Force Office of Scientific Research MURI program,A*STAR AME Young Individual Research Grant(YIRG,No.A2084c0172);National Research Foundation Singapore(CRP22-2019-0006);Advanced Research and Technology Innovation Centre(No.R-261-518-004-720);National Science Foundation under Grant No.2044281;Elemental Strategy Initiative conducted by MEXT,Japan,Grant Number JPMXP0112101001;JSPS KAKENHI Grant Number JP20H00354。

摘　　要：The topological features of optical vortices have been opening opportunities for free-space and on-chip photonic technologies,e.g.,for multiplexed optical communications and robust information transport.In a parallel but disjoint effort,polar anisotropic van der Waals nanomaterials supporting hyperbolic phonon polaritons(HP2s)have been leveraged to drastically boost light-matter interactions.So far HP2 studies have been mainly focusing on the control of their amplitude and scale features.Here we report the generation and observation of mid-infrared hyperbolic polariton vortices(HP2Vs)associated with reconfigurable topological charges.Spiral-shaped gold disks coated with a flake of hexagonal boron nitride are exploited to tailor spin-orbit interactions and realise deeply subwavelength HP2Vs.The complex interplay between excitation spin,spiral geometry and HP2 dispersion enables robust reconfigurability of the associated topological charges.Our results reveal unique opportunities to extend the application of HP2s into topological photonics,quantum information processing by integrating these phenomena with single-photon emitters,robust on-chip optical applications,sensing and nanoparticle manipulation.

关 键 词：Hyperbolic polariton vortex Light-matter interactions Spin-orbit interaction Topological charge RECONFIGURABILITY 

分 类 号：O17[理学—数学]