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Journal of Nanophotonics

Negative Goos-Hänchen shift in reflection from subwavelength gratings
Author(s): Yu-Chieh Cheng; Kestutis Staliunas
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Paper Abstract

A negative Goos–Hänchen (GH) shift of light beam reflecting from planar microphotonic structures consisting of two parallel dielectric subwavelength diffraction gratings is predicted. The phenomenon occurs because the energy flow of the mode guided in the subwavelength structure is predominantly directed in the opposite direction to the energy flow of the incident beam. The numerical calculations show that the negative GH shift can reach approximately six times that of the wavelength in realistic structures, so that the phenomenon can be experimentally observed. In addition to the negative lateral shift, the focusing of the beam in reflection from the grating is also observed as a secondary effect.

Paper Details

Date Published: 31 July 2014
PDF: 5 pages
J. Nanophoton. 8(1) 084093 doi: 10.1117/1.JNP.8.084093
Published in: Journal of Nanophotonics Volume 8, Issue 1
Show Author Affiliations
Yu-Chieh Cheng, Univ. Politècnica de Catalunya (Spain)
Kestutis Staliunas, Univ. Politècnica de Catalunya (Spain)
Institucio Catalana de Recerca i Estudis Avançats (ICREA) (Spain)

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