Influence of a dielectric decoupling layer on the local electric field and molecular spectroscopy in plasmonic nanocavities:a numerical study  

作　　者：Gong Chen Jiazhe Zhu Xiaoguang Li 陈功;朱嘉哲;李晓光(School of Physics,Zhengzhou University,Zhengzhou 450052,China;Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China;Institute for Advanced Study,Shenzhen University,Shenzhen 518060,China)

机构地区：[1]School of Physics,Zhengzhou University,Zhengzhou 450052,China [2]Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,China [3]Institute for Advanced Study,Shenzhen University,Shenzhen 518060,China

出　　处：《Chinese Optics Letters》2021年第12期110-115,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.12004343 and 11874268)。

摘　　要：In this Letter,we use electromagnetic simulations to systematically investigate the influence of a thin dielectric layer on the local electric field and molecular spectroscopy in the plasmonic junction.It is found that both the intensity and spatial confinement of the electric field and molecular spectroscopy can be significantly enhanced by applying a dielectric layer with large dielectric constant.We also discuss the optimal dielectric layer thickness to obtain the largest quantum efficiency of a dipole emitter.These results may be instructive for further studies in molecular spectroscopy and optoelectronics in plasmonic junctions.

关 键 词：PLASMONICS decoupling layer scanning tunneling microscope molecular spectroscopy tip-enhanced spectroscopy 

分 类 号：O53[理学—等离子体物理] O561[理学—物理]