Broadband hyperbolic thermal metasurfaces based on plasmonic phase-change material In3SbTe2

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Indexed by:Journal paper

Journal:Nanoscale

Included Journals:SCI

Affiliation of Author(s):华中科技大学

Discipline:Engineering

First-Level Discipline:Electronic Science And Technology

Document Type:J

DOI number:10.1039/D2NR07133A

Abstract:Thermal radiation modulation facilitated by phase change materials (PCMs) needs a large thermal radiation contrast in broadband as well as in a non-volatile phase transition, which are only partially satisfied by conventional PCMs. In contrast, the emerging plasmonic PCM In3SbTe2 (IST) that undergoes a non-volatile dielectric-to-metal phase transition during crystallization offers a fitting solution. Here, we have prepared IST-based hyperbolic thermal metasurfaces and demonstrated their capabilities to modulate thermal radiation. By laser-printing crystalline IST gratings with different fill factors on amorphous IST films, we have achieved multilevel, large-range, and polarization-dependent control of the emissivity modulation (0.07 for the crystalline phase and 0.73 for the amorphous phase) over a broad bandwidth (8-14 μm). With the convenient direct laser writing technique that supports large-scale surface patterning, we have also demonstrated promising applications of thermal anti-counterfeiting with hyperbolic thermal metasurfaces.