9 July 2004 Ultralow-loss photonic crystal waveguides based on the self-collimation effect
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Abstract
In this paper, we review the confinement mechanism of self-collimation in planar photonic crystals. In this mechanism, an approximately flat equi-frequency contour (EFC) below the light cone of the planar photonic crystal can be used to laterally confine the light and total internal reflection (TIR) provides vertical confinement. To this end, self-collimation in both low-index and high-index planar photonic crystals are investigated using the three-dimensional (3D) finite-difference time-domain (FDTD) method and the 3D iterative plane wave method (PWM). It is found that low-loss self-guiding is achievable in both the valence and conduction bands for high-index planar photonic crystals. However, for low-index planar photonic crystals, low-loss self-guiding can be only observed in the valence band. Experimental results show a propagation loss of as low as 1.1 dB/mm for the self-guiding in a high-index planar photonic crystals.
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Dennis W. Prather, Caihua Chen, Shouyuan Shi, Binglin Miao, David M. Pustai, Sriram Venkataraman, Ahmed S. Sharkawy, Garrett J. Schneider, Janusz A. Murakowski, "Ultralow-loss photonic crystal waveguides based on the self-collimation effect", Proc. SPIE 5360, Photonic Crystal Materials and Devices II, (9 July 2004); doi: 10.1117/12.518370; https://doi.org/10.1117/12.518370
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