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Ukrainian Journal of Physical Optics

Spontaneous emission of laser dye molecules in synthetic opals under conditions of low dielectric contrast

V. N. Moiseyenko, Mykhailo P. Derhachov, V. G. Shvachich, T. V. Shvets, О. Ф. Рощенко

Published Jan 1, 2010• 6 citations
Publisher

Abstract

Spontaneous emission of laser dye molecules (rhodamine 6G and pironin G) embedded into pores of synthetic opal photonic crystals is studied in the spectral region of 520-650 nm.It is ascertained that the emission spectra are greatly dependent on the photonic stop-band position and the spectral distribution of photon density of states.A dependence of spectral position of the emission band from the dielectric contrast is found.

DOI
10.3116/16091833/11/1/1/2010

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Spontaneous emission of laser dye molecules (rhodamine 6G and pironin G) embedded into pores of synthetic opal photonic crystals is studied in the spectral region of 520-650 nm.It is ascertained that the emission spectra are greatly dependent on the photonic stop-band position and the spectral distribution of photon density of states.A dependence of spectral position of the emission band from the dielectric contrast is found.
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 have observed strongly modified spontaneous-emission spectra from laser dye in photonic crystals made of inverse opals in titania (TiO2).({\mathrm{TiO}}_{2}).(TiO2​). We identify stop bands with large relative widths of 1515%,15 comparable to the dyes' emission spectrum, and 7575%75 attenuation of the emission strength. For a wide range of angles, two stop bands are simultaneously manifested; their angle-dependent frequencies display an avoided crossing that is corroborated by reflectivity experiments. The edges of the stop bands agree well with band-structure calculations, but differ from simple Bragg diffraction as a result of multiple wave coupling. The strongly reduced dispersion of the Bloch modes likely causes a significant change in the density of states.