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The effect of substrate on terahertz transmission properties through metal subwavelength dual-ring structure

Liu Jian-Feng Zhou Qing-Li Shi Yu-Lei Li Lei Zhao Dong-Mei Zhang Cun-Lin

The effect of substrate on terahertz transmission properties through metal subwavelength dual-ring structure

Liu Jian-Feng, Zhou Qing-Li, Shi Yu-Lei, Li Lei, Zhao Dong-Mei, Zhang Cun-Lin
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  • Abstract views:  1648
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  • Received Date:  25 March 2011
  • Accepted Date:  13 May 2011
  • Published Online:  15 April 2012

The effect of substrate on terahertz transmission properties through metal subwavelength dual-ring structure

  • 1. Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Department of Physics, Capital Normal University, Beijing 100048, China
Fund Project:  Project supported by the National Basic Research Program of China (Grant Nos. 2007CB310408, 2006CB302901), the National Natural Science Foundation of China (Grant Nos. 10804077, 11011120242, 10904098), the Beijing Municipal Commission of Education (Grant Nos. KM200910028006, KM201110028004), the Funding Project for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality, the State Key Laboratory of Functional Materials for Informatics, and the Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences.

Abstract: Terahertz waves through a split-ring resonator (SRR) can induce the resonant absorption, and this can be explained by using the theory of LC resonant circuit and the model of half wave resonance. However, in the dual-ring structure without the split gap, we still observe the resonant absorption in the THz frequency range. By analyzing the phenomenon, we think that it can be explained by using a the model of half wave resonance. Furthermore, it is found that if the structure is fabricated on quartz crystal substrate, we can obtain the angle-dependent terahertz waveforms using terahertz time-domain spectroscopy (TDS) when the sample is rotated in plane, as well as the frequency domain spectra. But this phenomenon does not exist in the silicon-based structure, which may be attributed to the birefringence effect of the quartz crystal substrate on the subwavelength metal dual-ring structure. The main purpose of this article is to explain the physical process of the effect.

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