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 m...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.展开更多
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 70h...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.展开更多
High-quality three-dimensional polystyrene opal photonic The transmission properties with different incident angles crystals are fabricated by vertical deposition method. and different composite refractive index contr...High-quality three-dimensional polystyrene opal photonic The transmission properties with different incident angles crystals are fabricated by vertical deposition method. and different composite refractive index contrasts are experimentally and theoretically studied. Cood agreement between the experiment and theory is achieved. We find that with the increasing incident angle, the gap position shifts to the short wavelength （blue shift） and the gap becomes shallower; and with the increase of refractive index of the opal void materials and decrease the contrast of refractive index, the gap position shifts to the long wavelength （red shift）. At the same time, we observe the swelling effects when the sample is immerged in the solutions with different refractive indices, which make the microsphere diameter in solution become larger than that in air. The understanding of band gap shift behaviour may be helpful in designing optical sensors and tunable photonic crystal ultrafast optical switches.展开更多
基金Supported by the National Basic Research Program of China under Grant Nos 2006CB921702 and 2007CB613205, the National Natural Science Foundation of China under Grant No 10525419.
文摘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.
基金Supported by the National Basic Research Program of China under Grant No 2007CB613205, and the National Natural Science Foundation of China under Grant No 10525419.
文摘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.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10525419 and 10634080, and the National Basic Research Programme of China under Grant No 2006CB921702.
文摘High-quality three-dimensional polystyrene opal photonic The transmission properties with different incident angles crystals are fabricated by vertical deposition method. and different composite refractive index contrasts are experimentally and theoretically studied. Cood agreement between the experiment and theory is achieved. We find that with the increasing incident angle, the gap position shifts to the short wavelength （blue shift） and the gap becomes shallower; and with the increase of refractive index of the opal void materials and decrease the contrast of refractive index, the gap position shifts to the long wavelength （red shift）. At the same time, we observe the swelling effects when the sample is immerged in the solutions with different refractive indices, which make the microsphere diameter in solution become larger than that in air. The understanding of band gap shift behaviour may be helpful in designing optical sensors and tunable photonic crystal ultrafast optical switches.
