7 November 2012 Spatial and spectral distributions of emission from dye-doped photonic crystals in reflection and transmission geometries
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Abstract
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 ~ 50%) of the first-order bandgap in the ΓL 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.
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE)
Munige S. Reddy, Ramarao Vijaya, Ivan D. Rukhlenko, Malin Premaratne, "Spatial and spectral distributions of emission from dye-doped photonic crystals in reflection and transmission geometries," Journal of Nanophotonics 6(1), 063526 (7 November 2012). https://doi.org/10.1117/1.JNP.6.063526 . Submission:
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