Ge Li, Qingli Zhou, Wanlin Liang, Cunlin Zhang,
https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10826/108261P/Resonance-coupling-and-optical-modulation-properties-in-terahertz-asymmetric-double/10.1117/12.2502510.short
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.
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