Superscattering-enhanced narrow band forward scattering antenna

作     者：胡德骄 张志友 杜惊雷 Hu De-Jiao;Zhang Zhi-You;Du Jing-Lei

作者机构：College of Physical Science and TechnologySichuan University High Energy Density Physics of the Ministry of Education Key LaboratorySichuan University Sino-British Joint Materials Research InstituteSichuan University 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2015年第24卷第10期

页      面：191-194页

核心收录：

学科分类：080904[工学-电磁场与微波技术] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 

基　　金：Project supported by the National Natural Science Foundation of China(Grant No.61377054) the Collaborative Innovation Foundation of Sichuan University,China(Grant No.XTCX 2013002) the International Cooperation and Exchange of Science and Technology Project in Sichuan Province,China(Grant No.2013HH0010) 

主　　题：surface plasmons optical antenna directional scattering Fano resonance 

摘      要：We present a narrow band forward scattering optical antenna which is based on the excitation of distinctive whispering gallery modes（WGMs）. The antenna is composed of three coaxial cylinder layers： a dielectric layer is sandwiched between a metallic core and cladding. Owing to the destructive interference between the scattering of the outer metallic cladding and the WGM in the backward direction, the power flow in the forward direction is increased. Simulation and analysis show that in proper geometry conditions, the cavity can be tuned into a superscattering state. At this state, both the zeroth and the first order of WGM are excited and contribute to the total scattering. It is shown that the power ratio（power towards backward divided by power towards forward） can be enhanced to about 27 times larger than that for a non-resonant position by the superscattering. Owing to the confinement of the cladding to WGMs, the wavelength range of effective forward scattering is considerably narrow（about 15 nm）.