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Title: Quasi-resonant enhancement of a grazing diffracted wave and deep suppression of specular reflection on shallow metal gratings in terahertz

We report on a previously unexamined anomaly at diffraction of THz radiation on metal gratings. This anomaly consists in a nearly complete redirection of energy to a non-specular homogeneous diffraction order propagating at a specific grazing angle and deep suppression of the specular reflection. We show that this anomaly is located far enough from the well-known one caused by the resonant excitation of the surface plasmon-polariton. The effect under consideration is of general nature and can exist in all spectrum regions; however, it is especially pronounced in THz region, where it should be taken into account when analyzing relevant experimental results.
Authors:
 [1] ;  [2] ; ; ;  [3]
  1. Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, Texas 78712 (United States)
  2. Institute of Radio Astronomy, National Academy of Sciences of Ukraine, Chervonopraporna 4, 61002 Kharkiv (Ukraine)
  3. A. Ya. Usikov Institute for Radiophysics and Electronics, National Academy of Sciences of Ukraine, Ac. Proskury 12, 61085 Kharkiv (Ukraine)
Publication Date:
OSTI Identifier:
22483113
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 26; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIFFRACTION; EXCITATION; GRATINGS; METALS; REFLECTION; SPECTRA; SURFACES