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5 March 2022 Tunable angle-independent mid-infrared optical filters using GST based microresonator arrays
Dylan J. Morden, Evan M. Smith, Ivan Avrutsky, Joshua R. Hendrickson, Shivashankar Vangala, Imad H. Agha
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Proceedings Volume PC12010, Photonic and Phononic Properties of Engineered Nanostructures XII; PC120100B (2022) https://doi.org/10.1117/12.2610149
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
We present the design of a transmission filter in mid-infrared and its experimental verification using phase change material GST (Germanium Antimony Telluride). Progressively increasing the annealing temperature of GST controls the crystalline structure, allowing the refractive index to increase significantly in a steady rate. One-dimensional metal dielectric sub-wavelength grating device, such that the dielectric segments are proportioned to decouple any angular-dependent resonance. Incorporating GST between metal gratings allows transmission wavelengths to be actively tuned as annealing increases refractive index. Amorphous and crystalline GST devices show transmission resonances up to 60 degrees indicate that angular-independence is preserved during material excitation.
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Dylan J. Morden, Evan M. Smith, Ivan Avrutsky, Joshua R. Hendrickson, Shivashankar Vangala, and Imad H. Agha "Tunable angle-independent mid-infrared optical filters using GST based microresonator arrays", Proc. SPIE PC12010, Photonic and Phononic Properties of Engineered Nanostructures XII, PC120100B (5 March 2022); https://doi.org/10.1117/12.2610149
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KEYWORDS
Crystals
Mid-IR
Optical filters
Microresonators
Annealing
Dielectric filters
Dielectrics
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