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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。
Based on the contour analysis and the finite-difference time-domain simulation, a non-diffracting beam propagating over a high local area of electromagnetic energy can be realized based on photonic crystal self-collimation. Columnar rectangular lattice photonic crystals were fabricated experimentally and 0.4mm self-collimation propagation was observed in the range of 1540nm-1570nm with infrared CCD. The transmission loss of the photonic crystal chain was estimated to be 17dB / mm . The broadband performance exhibited by this architecture, along with transmission distances on the order of millimeters, has the potential to be used in optical interconnects.