Capping metallic nanohelixes with SiO2 nanohelixes to enhance broadband and wide-angle light extinction | Zendy

YiJun Jen | Zendy; Chia-Liang Yu | Zendy; Meng-Jie Lin | Zendy; Chih-Yung Hsiao | Zendy

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Capping metallic nanohelixes with SiO₂ nanohelixes to enhance broadband and wide-angle light extinction

Author(s) -

YiJun Jen,

Chia-Liang Yu,

Meng-Jie 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°.

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