Three-dimensional mid-infrared photonic circuits in chalcogenide glass |
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Authors: | Ródenas Airán Martin Guillermo Arezki Brahim Psaila Nickolas Jose Gin Jha Animesh Labadie Lucas Kern Pierre Kar Ajoy Thomson Robert |
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Institution: | Scottish Universities Physics Alliance (SUPA), School of Engineering and Physical Sciences, Heriot Watt University, Edinburgh, United Kingdom. arodenas@gmail.com |
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Abstract: | We report the fabrication of single-mode buried channel waveguides for the whole mid-IR transparency range of chalcogenide sulphide glasses (λ ≤ 11 μm), by means of direct laser writing. We have explored the potential of this technology by fabricating a prototype three-dimensional three-beam combiner for future application in stellar interferometry that delivers a monochromatic interference visibility of 99.89% at 10.6 μm and an ultrahigh bandwidth (3-11 μm) interference visibility of 21.3%. These results demonstrate that it is possible to harness the whole transparency range offered by chalcogenide glasses on a single on-chip instrument by means of direct laser writing, a finding that may be of key significance in future technologies such as astrophotonics and biochemical sensing. |
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