Phase-change-based polarization-selective switching for multilevel emittance modulation

Area of Science:

• Materials Science
• Optics
• Nanotechnology

Background:

• Multilevel emittance modulation is crucial for advanced thermal management and anti-counterfeiting.
• Existing strategies often lack adaptability and versatility in spectral range.

Purpose of the Study:

• To present a novel smart multilevel radiator with enhanced emittance tunability.
• To demonstrate a design integrating In3SbTe2 (IST) and VO2 for dynamic spectral control.

Main Methods:

• Fabrication of a radiator using an In3SbTe2 (IST)-based linear grating on a VO2-based multilayer structure.
• Characterization of emittance modulation across the 2.5-30 μm spectral range.
• Analysis of underlying mechanisms involving Fabry-Perot resonance and in-plane anisotropy.

Main Results:

• Achieved four distinct emittance levels: 0.11, 0.27, 0.54, and 0.82.
• Demonstrated stable and excellent performance under wide-angle incidence.
• Verified the roles of VO2 phase change in FP resonance and IST phase change in anisotropy.

Conclusions:

• The developed smart multilevel radiator offers significant potential for applications in thermal anti-counterfeiting, thermal management, and energy conservation.
• The design provides a straightforward yet versatile platform for dynamic spectral control.