Baba Toshihiko, Matsumoto Takashi, Echizen Manabu
Opt Express. 2004 Sep 20;12(19):4608-13. doi: 10.1364/opex.12.004608.
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.
对光子晶体（PC）的输入和输出边界进行了优化，以使超棱镜具有低插入损耗。结果表明，对于相对于边界法线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。时域有限差分模拟表明，低损耗主要是通过界面入射光束的周期性相位调制实现的。它还展示了准直光束随波长变化的清晰转向。由色散介质组成的光子晶体也证明了角色散的增强。
