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13 March 2024 Demonstration of holographically fabricated large grating couplers for integrated circular beam delivery
Salman Ahmed, James Field, Dong-Woo Ko, Peter Horak, Christopher Holmes, Peter Smith, Paul Gow, Corin Gawith, James Gates, Rex H. S. Bannerman
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Proceedings Volume PC12889, Integrated Optics: Devices, Materials, and Technologies XXVIII; PC128890J (2024) https://doi.org/10.1117/12.3001912
Event: SPIE OPTO, 2024, San Francisco, California, United States
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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Salman Ahmed, James Field, Dong-Woo Ko, Peter Horak, Christopher Holmes, Peter Smith, Paul Gow, Corin Gawith, James Gates, and Rex H. S. Bannerman "Demonstration of holographically fabricated large grating couplers for integrated circular beam delivery", Proc. SPIE PC12889, Integrated Optics: Devices, Materials, and Technologies XXVIII, PC128890J (13 March 2024); https://doi.org/10.1117/12.3001912
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KEYWORDS
Beam delivery
Blazed gratings
Holography
Optical gratings
Fabrication
Free space
Ultraviolet radiation
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