Wide-angle coupling into rod-type photonic crystals with ultralow reflectance.
We describe the surprising phenomenon of near-perfect coupling from free space into uniform two-dimensional rod-type photonic crystals over a wide range of incident angles. This behavior is shown to be a generic feature of many rod-type photonic crystal structures that is related to strong forward scattering resonances of the individual cylinders. We explain these results using both semianalytic analysis and two-dimensional numerical calculations and identify the conditions under which efficient, wide-angle coupling can occur. The results may lead to more efficient designs for in-band photonic crystal devices such as superprisms and self-collimation based photonic circuits.
Botten
L C
LC
Centre for Ultrahigh-Bandwidth Devices for Optical Systems (CUDOS) and Department of Mathematical Sciences, University of Technology, Sydney, Broadway NSW 2007, Australia. lindsay.botten@uts.edu.au
White
T P
TP
de Sterke
C Martijn
CM
McPhedran
R C
RC