Abstract-Voltage adjusting characteristics in terahertz transmission through Fabry-Pérot-based metamaterials

OA

Jun Luo^1,2, Jiuning Lin¹, Xinyu Zhang^1,3, Hongshi Sang^1,2,a), An Ji⁴ and Changsheng Xie⁵
 HIDE AFFILIATIONS
1 School of Automation, Huazhong University of Science & Technology, Wuhan, 430074, China
2 College of Informatics, Huazhong Agricultural University, Wuhan, 430070, China
3 National Key Laboratory of Science & Technology on Multispectral Information Processing, Huazhong University of Science & Technology, Wuhan, 430074, China
4 Institute of Semiconductors, The Chinese Academy of Sciences, Beijing, 100083, China
5 Wuhan National Laboratory for Optoelectronics, Huazhong University of Science & Technology, Wuhan, 430074, China
a) Electronic mail: hongshi_hp_zhd@126.com
AIP Advances 5, 107238 (2015); http://dx.doi.org/10.1063/1.4935192
http://scitation.aip.org/content/aip/journal/adva/5/10/10.1063/1.4935192

Metallic electric split-ring resonators (SRRs) with featured size in micrometer scale, which are connected by thin metal wires, are patterned to form a periodically distributed planar array. The arrayed metallic SRRs are fabricated on an n-doped gallium arsenide (n-GaAs) layer grown directly over a semi-insulating gallium arsenide (SI-GaAs) wafer. The patterned metal microstructures and n-GaAs layer construct a Schottky diode, which can support an external voltage applied to modify the device properties. The developed architectures present typical functional metamaterial characters, and thus is proposed to reveal voltage adjusting characteristics in the transmission of terahertz waves at normal incidence. We also demonstrate the terahertz transmission characteristics of the voltage controlled Fabry-Pérot-based metamaterial device, which is composed of arrayed metallic SRRs. To date, many metamaterialsdeveloped in earlier works have been used to regulate the transmission amplitude or phase at specific frequencies in terahertz wavelength range, which are mainly dominated by the inductance-capacitance (LC) resonance mechanism. However, in our work, the external voltage controlled metamaterial device is developed, and the extraordinary transmission regulation characteristics based on both the Fabry-Pérot (FP) resonance and relatively weak surface plasmon polariton (SPP) resonance in 0.025-1.5 THz range, are presented. Our research therefore shows a potential application of the dual-mode-resonance-based metamaterial for improving terahertz transmission regulation.