基于二维长方晶格柱状光子晶体的衍射抑制

Diffraction inhibition in a two dimensional photonic crystal composed of silicon nanorods

通过等频图分析并结合时域有限差分法模拟,基于光子晶体自准直机制可以实现电磁能量高度局域的无衍射光束传播。实验上加工出柱状长方晶格光子晶体,利用红外CCD,在1540nm-1570nm波段范围内观测到0.4mm的自准直传播,通过粒子散射光亮度估算出光子晶体链上传输损耗为17dB/mm。该结构表现出来的宽频性能以及毫米量级的传输距离,使其具有应用在光互连中的潜力。

Diffraction inhibition with highly localized electromangnetic energy can be achieved with all angle self-collimation of photonic crystal.In this paper,we calculate and analyze the equi-frequency contours of photonic crystals with plane wave expansion method.The diffraction inhibition effect is achieved experimentally.A propagation length of 0.4mm is observed experimentally with our CCD camera with wavelength ranging from 1540nm to 1570nm.The propagation loss is calculated to be 17dB/mm by sampling the scattering light form the rods of the structure.The broadband property our structure exhibits and the millimeter scale propagation length make it possible for on-chip optical interconnection.