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Optical Engineering

Optical control of terahertz nested split-ring resonators
Author(s): Cai Yuan; Xiao-Lei Zhao; Xiao-Long Cao; Shi-Lin Xu; Nan-Nan Luan; Jian-Quan Yao
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Paper Abstract

Two kinds of optical modulation processes are designed based on nested split-ring resonators in the terahertz regime. By photo-conductivity induced mode switching effect, the resonant structure and resonant mode will be changed, and the two contrary tunable resonant properties are obtained. Without illumination, the two designs both have three resonant peaks. As the intensity of illumination increases, for the first design, the first and the third resonant peaks disappear and a broadband resonant peak at the second resonant frequency is formed eventually; however, the second design realizes an exactly opposite modulation process. Moreover, in order to identify the modulation mechanism, we discuss and analyze the distributions of the electric fields and surface currents in detail. Our designs can be implemented in tunable terahertz functional devices and provide important reference value for the design of terahertz metamaterial.

Paper Details

Date Published: 21 August 2013
PDF: 6 pages
Opt. Eng. 52(8) 087111 doi: 10.1117/1.OE.52.8.087111
Published in: Optical Engineering Volume 52, Issue 8
Show Author Affiliations
Cai Yuan, Tianjin Univ. (China)
Xiao-Lei Zhao, Tianjin Univ. (China)
Xiao-Long Cao, Tianjin Univ. (China)
Shi-Lin Xu, Tianjin Univ. (China)
Nan-Nan Luan, Tianjin Univ. (China)
Jian-Quan Yao, Tianjin Univ. (China)

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