21 August 2013 Optical control of terahertz nested split-ring resonators
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Optical Engineering, 52(8), 087111 (2013). doi:10.1117/1.OE.52.8.087111
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.
© 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
Cai Yuan, Xiao-Lei Zhao, Xiao-Long Cao, Shi-Lin Xu, Nan-Nan Luan, Jian-Quan Yao, "Optical control of terahertz nested split-ring resonators," Optical Engineering 52(8), 087111 (21 August 2013). http://dx.doi.org/10.1117/1.OE.52.8.087111
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KEYWORDS
Terahertz radiation

Gallium arsenide

Modulation

Split ring resonators

Semiconductors

Silicon

Metamaterials

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