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Ukrainian Journal of Physical Optics

Spontaneous emission spectra of organic molecules in synthetic opal photonic crystals

O. O. Guziy, B. Abusal, V. N. Moiseyenko, Mykhailo P. Derhachov, V. G. Shvachich

Published Jan 1, 2008• 1 citation
Publisher

Abstract

The emission of rhodamine 6G and 2,5-bis(2-benzoxazolyl)hydroquinone molecules embedded in synthetic opal photonic crystals are studied in the spectral range of 520-620 nm.It is found that the intensity of spontaneous emission is suppressed in the spectral region corresponding to the photonic stop band and is amplified on its "blue" side.

DOI
10.3116/16091833/9/3/164/2008

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The emission of rhodamine 6G and 2,5-bis(2-benzoxazolyl)hydroquinone molecules embedded in synthetic opal photonic crystals are studied in the spectral range of 520-620 nm.It is found that the intensity of spontaneous emission is suppressed in the spectral region corresponding to the photonic stop band and is amplified on its "blue" side.
The photonic dispersion, the group-velocity dispersion, the effective mass, refractive index, and the spectral distribution of the density of photonic states near the edge of the photonic stop band are numerically calculated in the one-dimensional model for photonic crystals based on synthetic opals. The fluorescence spectra of rhodamine 6G and 2,5-bis(2-benzoxazolyl)hydroquinone molecules infiltrated into a synthetic opal are measured. For both substances, it is observed that the spontaneous emission intensity in the range of the photonic stop band is appreciably suppressed. A blue shift of the fluorescence spectrum of rhodamine 6G molecules is revealed. Secondary emission of synthetic opals infiltrated with colloidal silver is observed in the Stokes range under excitation of opals by radiation at λ = 400 nm. The spectrum of the secondary emission is located in the range 450–590 nm, which contains the stop band and intervals near its edges.
We report on modification of the spontaneous emission of dye molecules embedded in a three-dimensional solid-state photonic crystal exhibiting a stop band in the visible range. Molecules embedded in artificial opal filled with a polymer show a dip in the fluorescence spectrum and nonexponential spontaneous decay kinetics containing both accelerated and inhibited components compared to the dye fluorescence in a reference polymer matrix. Results are interpreted in terms of redistribution of the photon density of states in the photonic crystal.