1 October 2010 Laser emission from self-assembled active photonic crystal matrix
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Three-dimensionally ordered photonic crystals were grown using self-assembly technique from Rhodamine-B dye doped polystyrene micro-spheres resulting in a stop band at 611 nm overlapping the emission spectrum of the dye. When excited at a wavelength away from the stop band, using a frequency-doubled Nd:YAG laser, the crystal showed angle-dependent suppression of spontaneous emission of the dye in the wavelength range of the photonic stop band and enhancement at the band edge, in reflection and transmission geometries. Spectral narrowing, a sharp threshold and a highly directional emission, all indicative of stimulated emission, were observed from the active photonic crystal matrix.
Sunita Kedia, Sunita Kedia, Ramarao Vijaya, Ramarao Vijaya, Alok K. Ray, Alok K. Ray, Sucharita Sinha, Sucharita Sinha, "Laser emission from self-assembled active photonic crystal matrix," Journal of Nanophotonics 4(1), 049506 (1 October 2010). https://doi.org/10.1117/1.3506524 . Submission:

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