High-Q Microcavity in Two-Dimensional Diamond Photonic Crystal Thin Films Realized via a Mode Gap

We design high quality factor （Q） photonic crystal microcavities in diamond films for applications in quantum information based on color centers. A photonic microcavity made from a waveguide heterostructure with a mode gap is demonstrated to have a high Q factor over 1051400 and a modal volume V of 2.24 cubic wavelengths by modifying the mode gap width and the tapered region geometry. Besides its ultrahigh Q factor, the waveguide-like geometry of the cavity allows for easy on-chip transportation of quantum information between different cavities.     

Waveguide Bend of 90° in Two-Dimensional Triangular Lattice Silicon Photonic Crystal Slabs

We design and realize a 90° waveguide bend in two-dimensional triangular lattice silicon photomc crystal slabs by connecting linear waveguides along the orthogonal Г - K and Г - M directions. A pass band of 70hm is realized by optimizing the geometry of the Г - M waveguide. The connection region of the waveguide bend is optimized to improve the transmission efficiency of infrared light through the two different kinds of waveguides. The transmission efficiency of an optimized single bend is about 75% in simulation and 45% in measurement.     

硅基二维平板光子晶体高Q微腔的制作和光谱测量

利用微加工技术, 在SOI上制作出了高Q值的光子晶体微腔, Q值可以达7×10⁴以上, 为后续的光与物质相互作用和量子信息方面的实验奠定了基础. 实验结果与理论模拟符合得较好. 通过三维时域有限差分法模拟, 得到光子晶体微腔的Q值为1.2×10⁵左右. 关键词： 光子晶体 微腔 微加工