Spatial and spectral distributions of emission from dye-doped photonic crystals in reflection and transmission geometries
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Title |
Spatial and spectral distributions of emission from dye-doped photonic crystals in reflection and transmission geometries
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Creator |
REDDY, MS
VIJAYA, R RUKHLENKO, ID PREMARATNE, M |
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Subject |
photonic crystals
suppression of spontaneous emission polar plots reflection and transmission geometries BAND-GAP PHOTOLUMINESCENCE |
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Description |
Spectral distribution of emission was measured in a large angular range (8 deg to 180 deg) around a self-assembled photonic crystal synthesized from colloids of Rhodamine-B dye-doped polystyrene. Its comparison with the emission from the same dye-doped colloids in a liquid suspension provides a better understanding of the anisotropic propagation of light within the structure due to its pseudo-gap properties. The spontaneous emission is suppressed by 40% in the presence of the stop band over a large bandwidth (similar to 50%) of the first-order bandgap in the Gamma L direction, due to the appropriate choice of the colloidal diameter. Spectral shifts in the spontaneous emission spectrum occur with the variation in the detection angle. The inevitable disorder in the self-assembled crystals and the resultant effect on emission was modeled by comparing the experimentally obtained reflection spectrum with the band structure calculated using the Korringa-Kohn-Rostoker method to exclude finite-size effects. Reflection and transmission are complementary because of the absence of strong absorptive effects. The extent of redistribution in the emission from a photonic crystalline environment with respect to a homogeneous emitter is significant in the spectral and spatial domains. (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.JNP.6.063526]
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Publisher |
SPIE-SOC PHOTO-OPTICAL INSTRUMENTATION ENGINEERS
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Date |
2014-10-15T11:03:47Z
2014-10-15T11:03:47Z 2012 |
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Type |
Article
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Identifier |
JOURNAL OF NANOPHOTONICS, 6
http://dx.doi.org/10.1117/1.JNP.6.063526 http://dspace.library.iitb.ac.in/jspui/handle/100/14815 |
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Language |
en
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