Open AccessCapping metallic nanohelixes with SiO2 nanohelixes to enhance broadband and wide-angle light extinction
Author(s) -
YiJun Jen,
Chang Yu,
MengJu Lin,
Chih-Yung Hsiao
Publication year - 2018
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.26.021510
Subject(s) - optics , materials science , extinction ratio , extinction (optical mineralogy) , wavelength , broadband , refractive index , molar absorptivity , optoelectronics , angle of incidence (optics) , physics
In this work, an SiO 2 nanohelix array is obliquely deposited upon a metal nanohelix array as an index matching layer to enhance light extinction. Firstly, an SiO 2 -Ag nanohelix array is fabricated with stronger light extinction than the Ag nanohelix array over wavelengths from 300 nm to 1000 nm at normal incidence. Next, the SiO 2 -Al-Ag nanohelix array is fabricated; it exhibits broadband and wide-angle light extinction that is stronger that reported for the Al-Ag nanohelix array. The unpolarized extinctance exceeds 90% over wavelengths from 400 nm to 2000 nm and angles of incidence from 0° to 70°.