Journal
OPTICS EXPRESS
Volume 17, Issue 4, Pages 2976-2983Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.17.002976
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- Ministry of Education, Culture, Sports, Science, and Technology of Japan [19049001]
- Scientific Research on the Priority Area gStrong Photon-Molecule Coupling Fields for Chemical Reactions [470]
- Hokkaido Innovation through Nanotechnology
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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 (similar to 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). (c) 2009 Optical Society of America
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