Low Temperature Physics: 42, 698 (2016); https://doi.org/10.1063/1.4960497
Surface plasmon-polariton resonance at diffraction of THz radiation on semiconductor gratings
I.S. Spevak1, A.A. Kuzmenko1, M. Tymchenko1, V.K. Gavrikov2, V.M. Shulga2, J. Feng3, H.B. Sun3, Yu.E. Kamenev1, and A.V. Kats1
1O. Ya. Usikov Institute for Radiophysics and Electronics of the National Academy of Sciences of Ukraine 12 Ac. Proskury, Kharkiv 61085, Ukraine
2Institute of Radio Astronomy of the National Academy of Sciences of Ukraine 4, Chervonopraporna, Kharkiv 61002, Ukraine
3Jilin University, 2699 Qianjin Str., Changchun 130012, China
Received March 16, 2016
Resonance diffraction of THz hidrogen cyanide laser radiation on a semiconductor (InSb) grating is studied both experimentally and theoretically. The specular reflectivity suppression due to the resonance excitation of the THz surface plasmon-polariton is observed on a pure semiconductor grating and on semiconductor gratings covered with a thin dielectric layer. The dielectric coating of the grating results in the resonance shift and widening depending both on the layer thickness and dielectric properties. A simple analytical theory of the resonance diffraction on rather shallow gratings covered with a dielectric layer is presented, and the results are in a good accordance with the experimental data. Analytical expressions for the resonance shift and broadening are essential for the resonance properties understanding and useful for sensing data interpretation of the agents deposited on the grating surface.
PACS: 42.25.Fx Diffraction and scattering
Key words: plasmon-polariton, semiconductor, resonance, diffraction, grating.
Published online: June 24, 2016