Ahmed, Salman, Bannerman, Rex, Field, James W, Ko, Dong-Woo, Horak, Peter, Holmes, Christopher, Smith, Peter G.R., Gow, Paul C., Gawith, Corin and Gates, James (2024) Demonstration of holographically fabricated large grating couplers for integrated circular beam delivery. García-Blanco, Sonia M. and Cheben, Pavel (eds.) In Integrated Optics: Devices, Materials, and Technologies XXVIII: SPIE Photonics West OPTO. vol. PC12889, SPIE.. (doi:10.1117/12.3001912).
Abstract
We present the use of holographic UV writing to fabricate 2D grating couplers in doped planar silica-on-silicon, enabling the creation of large (~1 cm) and efficient circular beam delivery into free space. Our fabrication process inscribes a channel waveguide with in-plane 60° blazed grating to expand a fibre-coupled beam within a planar core layer, followed by an out-of-plane 45° blazed grating to couple light out of the substrate. Our out-of-plane gratings are fabricated using a modified interferometric arrangement with a prism and index matching water layer, the arrangement and latest results will be presented here.
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