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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 22,
  • Issue 1,
  • pp. 136-
  • (2004)

Lithographically Fabricated Planar Holographic Bragg Reflectors

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Abstract

Planar holographic Bragg reflectors (HBRs) are computer-generated slab-waveguide holograms. They operate in two dimensions to provide powerful free-space-like spectral and spatial processing of optical signals in an integrated optics environment. An HBR typically images an input port to an output port while applying a specific spectral filtering function. HBRs are fully consistent with robust photolithographic or imprint-based fabrication and can be flexibly designed to offer a wide range of spatial wavefront control and single and multichannel spectral transfer functions. We report on lithographically fabricated,focusing HBRs implemented in the silica-on-silicon format whose spectral and spatial performances reach fundamental device limits set, respectively, by Fourier transform and diffractive constraints. We also demonstrate that HBRs support a unique process-friendly approach to apodization and overlay that uses fixed-depth etching and partial contour writing to achieve continuous reflective amplitude control of constitutive diffractive elements.

© 2004 IEEE

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