Abstract.
We report on germania/organically modified silane (ormosil) hybrid materials produced by the sol–gel technique for photonic applications. Acid-catalyzed solutions of γ-glycidoxypropyltrimethoxysilane mixed with germanium isopropoxide have been used as precursors for the hybrid materials. Planar waveguide films with a thickness of about 2 μm have been prepared by a single spin-coating process and low-temperature heat treatment from these high germanium content hybrid materials. Atomic force microscopy, thermal gravimetric analysis, UV–visible spectroscopy, and Fourier-transform infrared spectroscopy have been used to investigate the optical and structural properties of the films. The results have indicated that a dense, low absorption, and high transparency (in the visible range) waveguide film could be achieved at a low temperature. A strong UV-absorption region at short wavelengths ∼200 nm, accompanied by a shoulder peaked at ∼240 nm, has been noticed due to the neutral oxygen monovacancy defects. The propagation mode and loss properties of the planar waveguide films have also been investigated by using a prism-coupling technique.
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Received: 5 November 2002 / Revised version: 27 December 2002 / Published online: 19 March 2003
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Que, W., Hu, X. & Zhang, Q. Germania/ormosil hybrid materials derived at low temperature for photonic applications . Appl Phys B 76, 423–427 (2003). https://doi.org/10.1007/s00340-003-1119-5
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DOI: https://doi.org/10.1007/s00340-003-1119-5