title: Physical observation of single step UV-written integrated planar Bragg structures and their application as a refractive-index sensor.
abstract: We present what is to our knowledge the first demonstration of a potentially low-cost refractive-index sensor based on UV processing. A channel waveguide and a Bragg grating are defined in a single UV processing step, resulting in a buried structure with a well-defined grating period. A subsequent wet etch process located over the Bragg grating opens a sensing window in the device and reveals the grating structure. Sensitivity of as much as 5 x 10(-6) was inferred from our device.
authors.affiliation: Optoelectronics Research Centre, University of Southampton, Southampton SO17 1BJ, UK. greg.emmerson@stratophase.com
authors.forename: Gregory D
authors.initials: GD
authors.lastname: Emmerson
authors.forename: Corin B E
authors.initials: CB
authors.lastname: Gawith
authors.forename: Ian J G
authors.initials: IJ
authors.lastname: Sparrow
authors.forename: Richard B
authors.initials: RB
authors.lastname: Williams
authors.forename: Peter G R
authors.initials: PG
authors.lastname: Smith