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A high-efficiency in-plane splitting coupler for planar photonic Crystal self-collimation devices

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4 Author(s)
Binglin Miao ; Dept. of Electr. & Comput. Eng., Univ. of Delaware, Newark, DE, USA ; Chen, Caihua ; Shouyuan Shi ; Prather, D.W.

In this letter, we present the design, fabrication, and characterization of a high-efficiency in-plane splitting coupler for planar photonic crystal self-collimation devices. This splitting coupler consists of multiple concatenated in-plane reflective lenses and is capable of efficiently splitting and coupling a wide input beam into multiple narrow self-collimated beams. As an example, a one-to-two splitting coupler is simulated using the two-dimensional finite-difference time-domain method with an effective index used to account for the third dimension. The simulation shows a total coupling efficiency of 86% and a splitting ratio of two channels is 0.51 to 0.49. This device is also experimentally validated and the measured splitting ratio is 0.57 to 0.43.

Published in:

Photonics Technology Letters, IEEE  (Volume:17 ,  Issue: 1 )