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Simulation research on the control of terahertz beam direction by surface plasmon

Hu Hai-Feng Cai Li-Kang Bai Wen-Li Zhang Jing Wang Li-Na Song Guo-Feng

Simulation research on the control of terahertz beam direction by surface plasmon

Hu Hai-Feng, Cai Li-Kang, Bai Wen-Li, Zhang Jing, Wang Li-Na, Song Guo-Feng
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  • Abstract views:  3989
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  • Received Date:  09 February 2010
  • Accepted Date:  20 April 2010
  • Published Online:  15 January 2011

Simulation research on the control of terahertz beam direction by surface plasmon

  • 1. Institute of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China

Abstract: Based on the temperature-dependent complex dielectric constant of indium antimonide, an InSb-dielectric-InSb plasmonic waveguide structure with the grating was realized. At the frequency of 1 THz, a directional beam was obtained, and its radiation direction can be controlled by changing the temperature difference between the grating structures on each side. Finite difference time domain (FDTD) method was adopted to evaluate the relationship between the off-axis angle of the beam and the temperature difference. The tunable directional beaming can be attributed to the grating coupling of the TM surface modes in plasmonic waveguides.

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