Abstract
Reflection spectra of the (111) growth surface of opal photonic crystals differing in silica sphere diameter have been measured under illumination with narrowband ultraviolet and violet light from a laser and light-emitting diodes and with broadband light from a halogen lamp. We have found narrow strong bands differing in spectral position from the light from the short-wavelength excitation sources. The spectral position of these bands corresponds to that of photonic band gaps and is independent of excitation wavelength. The silica sphere diameter has no effect on the shape of the reflection band, and its position always correlates with that of the band gap of the opal. The present results demonstrate that exposure of a photonic crystal to short-wavelength radiation leads to conversion of the radiation to the spectral range of the band gap. The microscopic mechanism of the conversion process may involve three-photon parametric processes and amplification of the broadband photoluminescence due to structural defects in the silica matrix. Our results open up the possibility of creating new types of optically pumped solid gain media based on opal photonic crystals.
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Original Russian Text © V.S. Gorelik, L.S. Lepnev, A.O. Litvinova, 2014, published in Neorganicheskie Materialy, 2014, Vol. 50, No. 10, pp. 1086–1090.
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Gorelik, V.S., Lepnev, L.S. & Litvinova, A.O. Conversion of short-wavelength electromagnetic radiation in SiO2 opal photonic crystals. Inorg Mater 50, 1003–1006 (2014). https://doi.org/10.1134/S0020168514100082
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DOI: https://doi.org/10.1134/S0020168514100082