硅材料在红外通讯波段具有低损耗和高折射率的特性，使得其成为集成光学领域中应用最广的材料之一。主要介绍了本课题组在二维硅基平板光子晶体中实现微纳尺度上光调控的研究进展，讨论了利用光子晶体的缺陷态实现各种集成光学器件，包括光子晶体波导、微腔和利用光子晶体波导和微腔形成的滤波器。还介绍了光子晶体中特殊的光折射现象，包括红外波段的负折射和自准直现象。另外，简述了在高Q光子晶体微腔的制备和测量方面的研究进展。研究表明，硅基平板光子晶体能够在微纳尺度上灵活有效地控制光的传播，在集成光路中具有广泛的应用前景。

As silicon has a large refractive index and low loss in infrared wavelengths, it becomes an important optical material that has been widely used for integrated photonics applications. Some of our recent research progress on infrared two-dimensional silicon photonic crystal slab devices are presented. A series of photonic crystal waveguides are fabricated and characterized with novel geometries, resonant microcavities with fine tunability, and channel drop filters utilizing resonant coupling between waveguide and cavity. The remarkable dispersion properties of photonic crystals are also explored by engineering the band structures to achieve negative refraction and self-collimation effects of infrared light beams. The progress towards building and characterizing high-Q photonic crystal cavities is further introduced. All these results show that silicon photonic crystal can control light propagation in many flexible ways and have many potential applications in all-optical integrated circuits.