Optical properties of electrically active gold nanoisland films enabled with interfaced liquid crystals

Hung Chi Yen, Tsung Rong Kuo, Chun Ta Wang, Jia De Lin, Chia Chun Chen, Yu Cheng Hsiao

Research output: Contribution to journalArticle

Abstract

A system comprising a gold nanoisland film (Au NIF) covered with a liquid crystal (LC) material is introduced. By applying a voltage across the LC bulk, we demonstrate that changes in the refractive-index and orientation significantly modified the hybrid plasmonic–photonic resonances of the Au NIF. The hybrid structure enabled active control of the spectrum of the resonance wavelength of the metallic nanoisland by means of an externally applied electric field. Our modeling supports the observed results in LC/Au NIF. In a combination of the nanostructured surface with birefringent LCs, nonpolarized wavelength tunability of ~15 nm and absorbance tunability of ~0.024 were achieved in the visible wavelength, opening the door to optical devices and nanoscale sensors.

Original languageEnglish
Article number290
JournalNanomaterials
Volume10
Issue number2
DOIs
Publication statusPublished - 2020 Feb
Externally publishedYes

Keywords

  • Gold nanoisland film
  • Liquid crystal
  • Optical device

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

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