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5 March 2022 High-index topological insulator nanostructures for mid-infrared meta-optics
Sukanta Nandi, Danveer Singh, Pilkhaz Pilkhaz Nanikashvili, Shany Cohen, Doron Naveh, Tomer Lewi
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Proceedings Volume PC12011, High Contrast Metastructures XI; PC120110H (2022) https://doi.org/10.1117/12.2612103
Event: SPIE OPTO, 2022, San Francisco, California, United States
Abstract
Topological insulators (TIs) are a new class of condensed matter system that host topologically protected surface states, leading to dissipationless electron transport. This intrinsic characteristic makes them potential candidate for quantum computing owing to their ability to preserve quantum coherence. Recently, these systems and the concept of topology have been embraced by the photonics community as well. In this work, we study the mid-infrared optical properties of high index (n~5.2) TI bismuth selenide (Bi2Se3) nanobeams (NBs), grown by chemical vapor deposition. Using Finite-difference time-domain (FDTD) simulations and FTIR nanospectroscopy, we find that these NBs support size-tunable Mie-resonant modes across the infrared (~1-16 µm). Furthermore, polarized measurements reveal that the total optical response of these deep subwavelength NBs is composed of TE and TM resonant mode. Finally, near-filed studies are also carried out to understand the effect of topological phase.
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Sukanta Nandi, Danveer Singh, Pilkhaz Pilkhaz Nanikashvili, Shany Cohen, Doron Naveh, and Tomer Lewi "High-index topological insulator nanostructures for mid-infrared meta-optics", Proc. SPIE PC12011, High Contrast Metastructures XI, PC120110H (5 March 2022); https://doi.org/10.1117/12.2612103
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KEYWORDS
Mid-IR
Nanostructures
Niobium
Near field optics
Optical spectroscopy
Oscillators
Raman spectroscopy
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