Actively tunable angle-independent mid-infrared optical filters using GST Fabry-Perot resonators
2022 IEEE Research and Applications of Photonics in Defense Conference (RAPID)（2022）
Abstract
Germanium antimony telluride (GST) properties and experimental results of mid-infrared optical filter are demonstrated. Incorporating sub-wavelength gratings of GST-Ag, Fabry-Perot resonators produce transmission peak are observed. Active tuning by, thermal excitation, of GST shifts refractive index from 3.48-4.61 while maintaining angular independence up to 60°.
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Key words
Phase change materials,GST,optical filter,Fabry-Perot,active tuning
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