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Vacuum-tuned graded index polymer waveguides on silicon substrates

A new method using vacuum-drying is demonstrated for producing graded index (GRIN) profiles on type-A photolime gel-based polymer waveguides. Vacuum-drying allows optical waveguides to be built on higher index of refraction substrates without intermediate lower index cladding layers. The waveguide loss and graded index profiles were compared for vacuum-dried and alcohol-dried samples.