Resonance coupling and optical modulation properties in terahertz asymmetric double-wire structures

Ge Li; Qingli Zhou; Wanlin Liang; Cunlin Zhang

doi:10.1117/12.2502510

9 November 2018 Resonance coupling and optical modulation properties in terahertz asymmetric double-wire structures

Ge Li, Qingli Zhou, Wanlin Liang, Cunlin Zhang

Proceedings Volume 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V; 108261P (2018) https://doi.org/10.1117/12.2502510
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

Abstract

The spectral characteristics of the asymmetric double-wire structures have been investigated in the terahertz (THz) range. Based on the THz time-domain spectroscopy system, the spectral of the samples has been measured. It is shown that a transparent peak appears in the transmission spectrum which indicate that a resonance coupling exist between the two metal bars. Furthermore, we study the optical modulation properties when the pump light irradiates on the sample by using optical pump-terahertz probe technique (OPTP). The measured results indicate that the pump light can realize an optical switch effect to modulate the transmittance of THz wave. When adjusting the time delay between the optical pump and the terahertz probe pulses, the transmittance of THz wave varies, indicating the photoexcited carriers in the substrate have great influence on the resonance characteristics of the structure. Our obtained results indicate optical modulation method could provide the functionally potential applications in the terahertz modulators and filters.

Citation Download Citation

Ge Li, Qingli Zhou, Wanlin Liang, and Cunlin Zhang "Resonance coupling and optical modulation properties in terahertz asymmetric double-wire structures", Proc. SPIE 10826, Infrared, Millimeter-Wave, and Terahertz Technologies V, 108261P (9 November 2018); https://doi.org/10.1117/12.2502510

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KEYWORDS

Terahertz radiation

Modulation

Metals

Gallium arsenide

Transmittance

Electromagnetism

Semiconductors

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