Evolutionary Plasmonic Properties of Single Truncated Ag Nanowire-on-Au Film Nanocavity  

作　　者：朱鑫 张静云 杨翠红 李莹 陈云云 Xin Zhu;Jingyun Zhang;Cuihong Yang;Ying Li;Yunyun Chen(School of Physics&Optoelectronic Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean,Nanjing University of Information Science and Technology,Nanjing 210044,China;Jiangsu International Joint Laboratory on Meterological Photonics and Optoelectronic Detection,Nanjing University of Information Science and Technology,Nanjing 210044,China)

机构地区：[1]School of Physics&Optoelectronic Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,China [2]Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean,Nanjing University of Information Science and Technology,Nanjing 210044,China [3]Jiangsu International Joint Laboratory on Meterological Photonics and Optoelectronic Detection,Nanjing University of Information Science and Technology,Nanjing 210044,China

出　　处：《Chinese Physics Letters》2023年第5期104-108,共5页中国物理快报（英文版）

基　　金：the National Natural Science Foundation of China(Grant No.11604157);Nanjing University of Information Science&Technology(Grant No.2016206)。

摘　　要：Noble metal nanocavities have been widely demonstrated to possess great potential applications in nanooptics and nanophotonics due to their extraordinary localized surface plasmon resonance.However,most metal nanocrystals synthesized by chemical methods often suffer from truncation with different degrees due to oxidation and dissolution of metal atoms at corner and edges.We investigate the influence of shape truncation on the plasmonic properties of single Ag nanowire on Au film nanocavity using the finite difference time domain method.When the Ag nanowire(the circumradius R_(2)=50 nm)is gradually truncated from pentagonal to circular geometry,the scattering peak position of the nanocavity shows prominent blue shift from 962 nm to 608 nm,suggesting a nonnegligible role of truncation on plasmonic properties.The electric field strength and charge distribution of the structure reveal the evolution from dipole mode to quadrupole mode.It is also found that the plasmon resonance wavelength is linearly dependent on the truncation ratio R_(1)/R_(2)(R_(1) is the inradius)and the modulation slope is also reliable to the size of Ag nanowire.Our observations could shed light on developing high-performance tunable optical nano-devices in future.

关 键 词：cavity TRUNCATION RADIUS 

分 类 号：O53[理学—等离子体物理]