Major reshaping of narrow beams by resonant multilayer structures


Yurchenko V. B. , Ciydem M. , Gradziel M. L. , Murphy J. A.

OPTICS EXPRESS, vol.28, no.6, pp.8211-8222, 2020 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 28 Issue: 6
  • Publication Date: 2020
  • Doi Number: 10.1364/oe.386610
  • Title of Journal : OPTICS EXPRESS
  • Page Numbers: pp.8211-8222

Abstract

Major reshaping of electromagnetic MM-wave beams transmitted at resonant frequencies through high-quality multilayer structures is demonstrated. Beam reshaping emerges due to efficient excitation of intrinsic quasi-optical modes with complex spatial profiles by an incident beam. This leads to a significant increase of width and distortion of shape of transmitted beams, which grow with increasing likelihood of excitation of higher-order modes. The beam shape is extremely sensitive to imperfections of real structures and can become complex and asymmetric even at the normal-angle transmission of symmetric incident beams. The effect is of importance for the resonant MM-wave and THz spectroscopy of low-loss dielectric materials. (C) 2020 Optical Society of America under the terms of the OSA Open Access Publishing Agreement