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5 March 2022 Chalcogenides for static and active meta-optics
Tomer Lewi, Danveer Singh, Sukanta Nandi, Shany Cohen, Pilkhaz Nanikashvili, Michal Poplinger, Doron Naveh
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Proceedings Volume PC12011, High Contrast Metastructures XI; PC120110U (2022) https://doi.org/10.1117/12.2611142
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
We present a study of various compositions of the chalcogenide family used for static and active metasurfaces. We start with large area CVD grown amorphous spherical Selenium nanoparticles on various substrates and show that their Mie-resonant response spans the entire mid-infrared (MIR) range. By coupling Se Mie-resonators to ENZ substrates we demonstrate an order of magnitude increase in quality factor. Next, we investigate topological insulators Bi2Se3 and Bi2Te3 metasurfaces. We study the optical constants of single crystal Bi2Te3 in the NIR to the MIR range, followed by fabrication and characterization of metasurface disk arrays. We show that these high permittivity metasurfaces can yield very large absorption resonances using deep subwavelength structures. Finally, we demonstrate ultra-wide dynamic tuning of PbTe meta-atoms and metasurfaces, utilizing the anomalously large thermo-optic coefficient and high refractive index of this material.
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Tomer Lewi, Danveer Singh, Sukanta Nandi, Shany Cohen, Pilkhaz Nanikashvili, Michal Poplinger, and Doron Naveh "Chalcogenides for static and active meta-optics", Proc. SPIE PC12011, High Contrast Metastructures XI, PC120110U (5 March 2022); https://doi.org/10.1117/12.2611142
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KEYWORDS
Chalcogenides
Modulation
Chemical vapor deposition
Dielectrics
Phase shift keying
Resonators
Selenium
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