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Enhanced photoluminescence in [Er2O3/TiO2]m photonic crystals

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3 Author(s)
Grishin, A.M. ; Department of Condensed Matter Physics, Royal Institute of Technology, SE-164 40 Stockholm-Kista, Sweden ; Khartsev, S.I. ; Dzibrou, D.O.

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We survey optical properties of [Er2O3/TiO2]6/Er2O32/[TiO2/Er2O3]6 photonic crystals (PCs) pulsed laser deposited on to the glass substrates. The dispersion relations of refractive indexes and extinction coefficients of the constituent materials were obtained from the comparison of experimental and simulated transmission spectra of single layer Er2O3 and TiO2 reference films. Based on these data several PCs have been designed and grown to match stop band and cavity mode resonance at wavelengths close to the 523 nm Er3+-ion Fraunhofer 4S3/2 absorption line. Precise control of chemical composition and uniform multilayer thickness enable achievement of superior optical performance of sintered PCs. Obtained dispersion relations were combined with the 2×2 transfer matrix formalism to compute PC transmittance that appeared to be in a good agreement with the experimental spectra. Pumping PCs with 514 nm light source we observed a strong photoluminescence (PL) at 1535 nm. In PC specially designed for the resonance wavelength λres=514 nm, C-band PL intensity experiences fivefold enhancement compared to a single layer Er2O3 film of equivalent thickness.

Published in:

Journal of Applied Physics  (Volume:105 ,  Issue: 11 )