Hypersensitisation and Patterned Photosensitivity in Glass

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Recent developments involving holographically patterned photosensitivity in glass-based optical waveguides developed by our group can be extended to fabricate complex two-dimensional structures including planar waveguide photonic bandgap devices for applications in telecommunications, sensing and signal processing. These will include novel grating-array based 2-D DFB lasers and filters in rare-earth doped planar waveguides. Novel etching techniques to be used to enhance index contrast, as well as to characterise such devices, will be developed based on our recent observation of hydrogen-enhanced etching of glass. Such methods could potentially be applicable to not only photonic technologies but also semiconductor lithography of oxides.