Optical Anapole Modes in Gallium Phosphide Nanodisk with Forked Slits for Electric Field Enhancement

Nanomaterials

Paul K. Chu¹  Zao Yi²  Tao Sun³  He Zhang⁴  Chao Liu⁴  Haiwei Mu⁴  Xianli Li⁴  Jingwei Lv⁴  Famei Wang⁴ 

[1] Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, China;Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China;Media Lab, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;School of Physics and Electronic Engineering, Northeast Petroleum University, Daqing 163318, China;

关键词: dielectric nanostructures;    anapole modes;    gallium phosphide;    electric field enhancement;   

DOI  :  10.3390/nano11061490

来源: DOAJ

【 摘 要 】

High refractive index dielectric nanostructures represent a new frontier in nanophotonics, and the unique semiconductor characteristics of dielectric systems make it possible to enhance electric fields by exploiting this fundamental physical phenomenon. In this work, the scattered radiation spectral features and field-enhanced interactions of gallium phosphide disks with forked slits at anapole modes are investigated systematically by numerical and multipole decomposition analyses. Additional enhancement of the electric field is achieved by opening the forked slits to create high-intensity hot spots inside the disk, and nearby molecules can access these hot spots directly. The results reveal a novel approach for near-field engineering such as electric field localization, nonlinear optics, and optical detection.

【 授权许可】

Unknown