Journal article
Gradient-index antireflective subwavelength structures for planar waveguide facets.
Abstract
We demonstrate the use of subwavelength gratings etched into the facets of silicon-on-insulator ridge waveguides as a means of reducing facet reflectivity by the gradient-index effect. Reflectivities as low as 2.0% and 2.4% for the fundamental TE and TM modes, respectively, are demonstrated experimentally for light of 1.55 microm wavelength, in agreement with both effective medium theory and finite-difference time domain calculations. …
Authors
Schmid JH; Cheben P; Janz S; Lapointe J; Post E; Xu D-X
Journal
Optics Letters, Vol. 32, No. 13, pp. 1794–1796
Publisher
Optica Publishing Group
Publication Date
July 1, 2007
DOI
10.1364/ol.32.001794
ISSN
0146-9592