title: Holographic Bragg grating input-output couplers for polymer waveguides at an 850-nm wavelength.
abstract: Bragg gratings used as input-output couplers in polymeric waveguides have been demonstrated at infrared wavelengths. These Bragg grating couplers were holographically formed volume phase gratings with a near-45 degrees fringe slant angle embedded directly into a waveguide layer. A photopolymer was used for both producing a planar waveguide and constructing the embedded Bragg grating coupler. A coupling efficiency of 23% for input and 5% for output has been achieved at 850 nm. The output-coupling beam profiles are also discussed.
authors.forename: Q
authors.initials: Q
authors.lastname: Huang
authors.forename: P R
authors.initials: PR
authors.lastname: Ashley