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Application of sol-gel films in optical wavelength filters

Blue, Robert and Mauchline, I. S. and Stewart, G. (1994) Application of sol-gel films in optical wavelength filters. Electronics Letters, 30 (5). 402 - 403.

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The authors report the use of a sol-gel film as an overlay guide on an integrated optic buried channel waveguide to selectively couple out near-infra-red wavelengths. The coupling wavelength is shown to be dependent on the thickness and index of the overlay and on the polarisation of the guided light