Abstract
Tunable thermal emitters have attracted much attention due to their applications in communications, sensing, and control system. To date, the emission performance of many reported thermal emitters require continuous external energy for the purpose of continuous modulation. Here, a Ge2Sb2Te5 (GST) array-based metasurface thermal emitter is proposed and measured. The maximum emissivity (crystalline) is 95.3%, while the minimum emission (amorphous) amplitude is 15.1%. Based on the phase transition states (amorphous and crystalline) of the GST array, the emission amplitude and resonance wavelength of this metasurface thermal emitter are clearly switchable. Moreover, the thickness of the GST arrays is set to be 1.5μm, 2.0μm, and 2.5μm, which results in the emissivity peak shifting to longer resonant wavelengths. The thermal emitter reveals continuous tunability, broad wavelength selectivity, and switchability.
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