Wide-angle coupling into rod-type photonic crystals with ultralow reflectance

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Journal Article
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, 2006, 74 (2)
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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. © 2006 The American Physical Society.
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