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Proceedings Paper

Abnormal propagation and interface refraction of light in a photonic crystal and their applications
Author(s): Wei Jiang; Chuhua Tian; Linghui Wu; Yihong Chen; Ray T. Chen
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Paper Abstract

We analyze the abnormal refraction and propagation when a light beam of finite and practical width enters a photonic crystal from a uniform medium. The beam propagation in the photonic crystal is very complex, and in many cases, is beyond the realm of refraction (even with a renormalized refractive index given by photonic band calculation). Generally, light propagation is restricted to a triangular region (or a fan), although the light may not fill the whole triangle, nor is the light intensity uniform in the triangle. It is found beam divergence does not have a definite connection with the fan shape of the region of light propagation, in contrast to dynamic X-ray theory. A new origin of the fan shape is suggested. Also simulations indicate that at microscale, a narrow light beam may zigzag in a photonic crystal with sufficiently high index contrast. An application of this phenomenon is to make a wide angle bend for waveguides. The designed bending structure has low loss and matches the mode size of a typical single-mode waveguide for fiber-optic communications. Our simulations are based on two-dimensional photonic crystals.

Paper Details

Date Published: 9 July 2003
PDF: 6 pages
Proc. SPIE 5000, Photonic Crystal Materials and Devices, (9 July 2003); doi: 10.1117/12.479511
Show Author Affiliations
Wei Jiang, Univ. of Texas at Austin (United States)
Chuhua Tian, Univ. of Texas at Austin (United States)
Linghui Wu, Omega Optics, Inc. (United States)
Yihong Chen, Omega Optics, Inc. (United States)
Ray T. Chen, Univ. of Texas at Austin (United States)

Published in SPIE Proceedings Vol. 5000:
Photonic Crystal Materials and Devices
Ali Adibi; Axel Scherer; Shawn Yu Lin, Editor(s)

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