部分空气桥式硅膜二维光子晶体

描述在Si基底上制备带隙在近红外波段部分空气桥式二维光子晶体（PC）.选用HF酸溶液作为腐蚀液，利用聚焦离子束刻蚀技术直接刻蚀出具有三角形空气洞结构的二维PC，并测出了二维PC完整的第一带隙透过谱的带隙范围为123—155μm.实验测得的透过谱与理论计算的空气桥式二维PC的计算结果一致.类TM0模的存在减小了带隙的宽度.由于部分SiO2支撑桥式平板，二维PC易于按所需尺寸进行制备.同时，通过改变平板下的支撑材料，可以制出有源的PC，利用这种机理可以把光从支撑材料中引出.关键词：二维光子晶体带隙平板波导

Two-dimensional silicon-based photonic crystal slab with partial air-bridge

We describe the fabrication process of a two_dimensional silicon_based photonic crystal (PC) slab with partial air_bridge, which has a photonic band gap in the near IR range .The process involves the formation of the air_bridge silicon slab by wet etching and the fabrication of periodic air holes by a focused ion beam. We successfully obtained such a sample and measured its transmission in a wide spectrum. It is found that the observed spectrum is consistent with the theoretical values calculated by the plane wave expansion method. The TM 0_like modes reduce the size of the band gap, and the partial air bridge is beneficial to the fabrication of large PC slabs. Meanwhile, it is possible to draw light out from the supporting material of the air bridge.