Open AccessSimulation research on the control of terahertz beam direction by surface plasmon
Author(s) -
Haifeng Hu,
Ling Cai,
Wei Bai,
Jing Zhang,
Lina Wang,
Guofeng Song
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.014220
Subject(s) - indium antimonide , grating , terahertz radiation , optics , finite difference time domain method , materials science , plasmon , surface plasmon , beam (structure) , dielectric , optoelectronics , waveguide , surface plasmon polariton , physics
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.