Gradient-index antireflective subwavelength structures for planar waveguide facets

被引：57
|
作者：
Schmid, J. H. [1 ]
Cheben, P. [1 ]
Janz, S. [1 ]
Lapointe, J. [1 ]
Post, E. [1 ]
Xu, D.-X. [1 ]
机构：
[1] Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada
来源：
OPTICS LETTERS | 2007年 / 32卷 / 13期
关键词：
D O I：
10.1364/OL.32.001794
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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 mu m wavelength, in agreement with both effective medium theory and finite-difference time domain calculations. Simulations show that facet reflectivites can be further reduced to less than 1% by increasing the grating modulation depth. (c) 2007 Optical Society of America.
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页码：1794 / 1796
页数：3
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