Finite difference time domain study of high efficiency photonic crystal superprisms
Finite difference time domain study of high efficiency photonic crystal superprisms
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DOI：
10.1364/opex.12.004608
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发表时间：
2004-09-20
期刊：
影响因子：
3.8
通讯作者：
Echizen, M
中科院分区：
文献类型：
--
作者：
Baba, T;Matsumoto, T;Echizen, M
光子晶体（PC）的输入和输出边界经过优化，使超棱镜具有较低的插入损耗。结果表明，对于相对于边界法向的光的小入射角和大入射角，投影气孔和半圆形气孔界面分别实现了 0.3 dB 和 1.0 dB 的传输损耗。时域有限差分仿真表明，低损耗本质上是通过界面对入射光束进行周期性相位调制来实现的。它还展示了不同波长的准直光束的清晰转向。由色散介质组成的PC也证明了角色散的增强。 (C) 2004 年美国光学学会。
Input and output boundaries of a photonic crystal ( PC) are optimized so that the superprism exhibits low insertion loss. It is shown that projected-airhole and half-circular airhole interfaces achieve transmission loss of 0.3 dB and 1.0 dB, respectively, for small and large incident angles of light against normal to boundaries. The finite-difference time-domain simulation shows that a low loss is essentially realized by a periodic phase modulation of the incident beam by the interfaces. It also demonstrates the clear steering of collimated light beam with varying wavelength. The enhancement of angular dispersion is also demonstrated by a PC composed of a dispersive medium. (C) 2004 Optical Society of America.