Nishijima Yoshiaki, Ueno Kosei, Juodkazis Saulius, Mizeikis Vygantas, Fujiwara Hideki, Sasaki Keiji, Misawa Hiroaki
Research Institute for Electronic Science, Hokkaido University, CRIS Bldg., Kita 21 Nishi 10, Kita-ku Sapporo 001-0021, Japan.
Opt Express. 2009 Feb 16;17(4):2976-83. doi: 10.1364/oe.17.002976.
Lasing in dye solution-embedded inverse silica opal structures was investigated. The opal films were prepared by sedimentation of polystyrene microspheres on a cover glass. The polystyrene structures were inverted using sol-gel infiltration of silica and subsequent removal of polystyrene. Photoluminescence of rhodamine (rhodamine B, 6G and sulfo-rhodamine 101) dye solutions embedded into the inverse silica opal structures exhibited clear signatures of the lasing via a distributed feedback (DFB) and gain modulation. The refractive index contrast between the dye and the inverse opal was small enough (approximately 0.03%) for the formation of refractive index coupling between the lasing modes. The lasing spectrum exhibited a highly regular periodic structure of modal peaks, rather than the chaotic superposition of peaks reported in previous studies. Lasing modes having a spectral width of about 0.25 nm and a free spectral range of about 0.75 nm appeared at the position of the maximum gain (the maximum fluorescence of the dye).
研究了染料溶液嵌入的反相二氧化硅蛋白石结构中的激光发射。蛋白石薄膜通过将聚苯乙烯微球沉积在盖玻片上制备而成。利用二氧化硅的溶胶 - 凝胶渗透及随后聚苯乙烯的去除对聚苯乙烯结构进行反转。嵌入反相二氧化硅蛋白石结构中的罗丹明（罗丹明B、6G和磺基罗丹明101）染料溶液的光致发光通过分布反馈（DFB）和增益调制呈现出清晰的激光发射特征。染料与反蛋白石之间的折射率对比度足够小（约0.03%），有利于在激光模式之间形成折射率耦合。激光光谱呈现出模态峰的高度规则周期性结构，而非先前研究中报道的峰的混沌叠加。光谱宽度约为0.25 nm且自由光谱范围约为0.75 nm的激光模式出现在最大增益位置（染料的最大荧光处）。
