We report an unusual case of spectral filtering by a silica waveguide containing Si nanocrystals (Si-nc's) deposited on a silica plate. For a number of Si-rich silica (Si Ox) slab waveguides annealed at 1100 °C, the TE and TM waveguide mode cutoff positions are found in the inversed order with respect to the classical waveguide theory for an isotropic material. Using the cutoff and m -line spectra, this unusual behavior was explained assuming an optical birefringence of the material. For the highest Si content (x∼1.5), we estimated a maximal positive birefringence of ∼8%. The cutoff spectrum simulated with the optical parameters extracted from the m -line measurements corresponds well to the cutoff spectrum directly obtained by measuring waveguided luminescence. This agreement shows that the spectral filtering effect of silica layers containing Si-nc can be described within the quantitative model of delocalized waveguide modes. The possible origin for the observed birefringence is discussed. © 2007 American Institute of Physics.

Spectroscopy of silica layers containing Si nanocrystals: Experimental evidence of optical birefringence

OTON NIETO, CLAUDIO JOSE;
2007-01-01

Abstract

We report an unusual case of spectral filtering by a silica waveguide containing Si nanocrystals (Si-nc's) deposited on a silica plate. For a number of Si-rich silica (Si Ox) slab waveguides annealed at 1100 °C, the TE and TM waveguide mode cutoff positions are found in the inversed order with respect to the classical waveguide theory for an isotropic material. Using the cutoff and m -line spectra, this unusual behavior was explained assuming an optical birefringence of the material. For the highest Si content (x∼1.5), we estimated a maximal positive birefringence of ∼8%. The cutoff spectrum simulated with the optical parameters extracted from the m -line measurements corresponds well to the cutoff spectrum directly obtained by measuring waveguided luminescence. This agreement shows that the spectral filtering effect of silica layers containing Si-nc can be described within the quantitative model of delocalized waveguide modes. The possible origin for the observed birefringence is discussed. © 2007 American Institute of Physics.
2007
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11382/510999
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