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Terahertz surface plasmon polariton couping on brass rods

Chen Hua Wang Li

Terahertz surface plasmon polariton couping on brass rods

Chen Hua, Wang Li
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Publishing process
  • Received Date:  29 August 2008
  • Accepted Date:  22 October 2008
  • Published Online:  20 July 2009

Terahertz surface plasmon polariton couping on brass rods

  • 1. (1)东南大学物理系,南京 210096; (2)中国科学院物理研究所光物理实验室,北京 100190

Abstract: In the experiment for studying the nature of coupling between suface plasmon (SP) wave and terahertz radiation by subwavelenth-sized brass rods, we found that the polarization of the THz field, size of rods, and slit between rods critically affect the coupling efficiency. By the method of Fourier transform of the time domain data, we found the coupling frequency in THz range. With equal slits between the brass rods, we demonstrated thar the transmission resonance is attributed to the combined effects of surface plasmon and cavity mode resonance when the electric vector is perpendicular to the grating wires, while the cavity mode resonance dominates the resonance transmission when they are parallel.

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