Optimization of nanocavity field enhancement using two-dimensional plasmonic photonic crystals

作     者：TAO Xing DONG ZhenChao 

作者机构：Hefei National Laboratory for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2012年第57卷第1期

页      面：77-82页

核心收录：

学科分类：070207[理学-光学] 07[理学] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0702[理学-物理学] 

基　　金：supported by the National Basic Research Program of China(2006CB922003,2011CB921402) Chinese Academy of Sciences(KJCX2.YW.H06) National Natural Science Foundation of China(91021004,10574117,10974186) 

主　　题：二维光子晶体 电浆 谐振腔模式 时域有限差分方法 优化 表面等离子 傅立叶频谱 PPC 

摘      要：We have investigated the influence of Ag nanorod radius(r)on the resonant modes of a two-dimensional plasmonic photonic crystal(PPC)with dipole sources embedded into the central vacancy area,using finite-difference time-domain *** the localized surface plasmon(LSP)mode of individual Ag nanorods and the resonant cavity mode of PPC are found to vary as a function of *** resonant cavity mode is strongly enhanced as r is increased,while the LSP signal will eventually become no longer discernable in the Fourier spectrum of the time-evolved *** optimized condition for the nanocavity field enhancement is found for a given PPC periodicity(e.g.d=375 nm)with the critical nanorod radius rc=d/*** this point the resonant cavity mode has the strongest field enhancement,best field confinement and largest *** attribute this to competition between the blocking of cavity confined light to radiate out when the cavity resonant frequency falls inside the opened photonic stopband as r reaches rc,and the transfer of cavity mode energy to inter-particle plasmons when r is further increased.