Focusing performance of small f-number metallic lens with depth-modulated slits  

作　　者：高扬 张学如 王玉晓 宋瑛林 刘树田 

机构地区：[1]Department of Physics,Harbin Institute of Technology

出　　处：《Chinese Physics B》2010年第12期242-247,共6页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China (Grant No. 2006CB302901);the Foundation of the Ministry of Science and Technology of China for the International Collaboration on Scientific Research (Grant No. 2009DFA50620)

摘　　要：This paper studies a small f-number metallic lens with depth-modulated slits. Slits filled with dielectric between silver plates are designed to produce desired optical phase retardations based on the particular propagation properties of surface plasmon polaritons in nanostructures. Numerical simulation of this structure is performed through the finite- difference time-domain method. Different from the conventional dielectric lens, the metallic lens can be used as a pure phase element without energy loss brought by the light refraction at curved surfaces and total internal reflection. The focusing performance is consequently improved, with larger diffraction efficiency than that of the same shaped dielectric lens.This paper studies a small f-number metallic lens with depth-modulated slits. Slits filled with dielectric between silver plates are designed to produce desired optical phase retardations based on the particular propagation properties of surface plasmon polaritons in nanostructures. Numerical simulation of this structure is performed through the finite- difference time-domain method. Different from the conventional dielectric lens, the metallic lens can be used as a pure phase element without energy loss brought by the light refraction at curved surfaces and total internal reflection. The focusing performance is consequently improved, with larger diffraction efficiency than that of the same shaped dielectric lens.

关 键 词：surface plasmon polaritons subwavelength structures finite-difference time-domain 

分 类 号：TN25[电子电信—物理电子学]