Open AccessUltraviolet light-induced terahertz modulation of an indium oxide film
Author(s) -
Hongyu Ji,
Bo Zhang,
Wei Wang,
Longfeng Lv,
Jingling Shen
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.26.007204
Subject(s) - materials science , optoelectronics , indium , terahertz radiation , indium tin oxide , optics , oxide , ultraviolet , absorption (acoustics) , modulation (music) , layer (electronics) , nanotechnology , physics , acoustics , metallurgy , composite material
Active ultraviolet light-induced terahertz modulation of an indium oxide film is investigated. A large absorption modulation of ~66% is achieved upon illumination with a low intensity UV laser (11 mW/cm 2 ). The interaction between indium oxide and a flexible metamaterial structure is investigated owing to the large UV-induced enhancement of photo carriers observed in an indium oxide film. We are able to realize absorption peak shifts of 37 GHz by changing the UV excitation light intensity. We also propose a multi-frequency switch by building a circular metallic split ring resonator whose gaps are filled with silicon, germanium, and indium oxide. In future, a photo-excited tunable multi-frequency metamaterial switch can be realized by irradiating the structure with multi-wavelength laser beam.