High quality resonances for terahertz radiation diffraction at periodically corrugated semiconductor interfaces |
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Authors: | I S Spevak M A Timchenko V K Gavrikov V M Shulga J Feng H B Sun A V Kats |
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Institution: | (1) Institute of Electronics “E. Djakov”, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria;(2) Faculty of Physics, Sofia University “St. Kliment Ohridski”, 1164 Sofia, Bulgaria |
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Abstract: | It is shown that the resonance features analogous to the well known optic Wood-type anomalies can be observed in the THz region
for diffraction at periodically profiled semiconductor surfaces. The analytical theory of such resonance processes caused
by excitation of surface plasmon polaritons (SPPs) is developed. It is shown that strong resonance effects such as total suppression
of the specular reflection (TSSR) can be achieved for rather small inclinations of harmonic gratings. The analytical theory
predictions are confirmed by strict numerical simulations. The analytical approach presented allows one to find parameters
of the gratings so that the resonance diffraction results in specific redistributions of the reflected energy between different
diffraction channels. As an example we demonstrate parameters of the InSb biharmonic grating responsible for the TSSR accompanied
by 50% reflection in the minus first diffraction order when the SPP is excited in the plus first diffraction order. |
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