Active control of surface plasmon polaritons with phase change materials  

作　　者：漆元臻 蒋瞧 向红 韩德专 Yuan-Zhen Qi;Qiao Jiang;Hong Xiang;De-Zhuan Han(Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics,Chongqing University,Chongqing 401331,China)

机构地区：[1]Department of Physics and Chongqing Key Laboratory for Strongly Coupled Physics,Chongqing University,Chongqing 401331,China

出　　处：《Chinese Physics B》2023年第10期428-432,共5页中国物理B（英文版）

摘　　要：Active control of surface plasmon polaritons(SPPs)is highly desired for nanophotonics.Here we employ a phase change material Ge_(2)Sb_(2)Te_(5)(GST)to actively manipulate the propagating direction of SPPs at the telecom wavelength.By utilizing the phase transition-induced refractive index change of GST,coupled with interference effects,a nanoantenna pair containing GST is designed to realize switchable one-way launching of SPPs.Devices based on the nanoantenna pairs are proposed to manipulate SPPs,including the direction tuning of SPP beams,switchable SPP focusing,and switchable cosine–Gauss SPP beam generating.Our design can be employed in compact optical circuits and photonics integration.

关 键 词：surface plasmon polaritons phase change materials direction control non-diffractive 

分 类 号：O53[理学—等离子体物理] TB34[理学—物理]