Brochosome-inspired binary metastructures for pixel-by-pixel thermal signature control
Zhuo Li1, Lin Wang2,3, Xiu Liu1
1Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
Science Advances
|March 1, 2024
Summary
Researchers created binary metastructures, inspired by leafhopper brochosomes, for microscale thermal signature control. These "pixel twins" enable binary thermal display while remaining visually hidden, advancing optical security and data encryption.
Area of Science:
- Metamaterials science
- Nanophotonics
- Thermal engineering
Background:
- Microscale thermal signature control is difficult with incoherent sources.
- Existing plasmonic and phase-change materials have limitations.
Purpose of the Study:
- To develop pixelated thermal signature control at the microscale.
- To create binary metastructures inspired by natural structures for thermal information display and camouflage.
Main Methods:
- Designed binary metastructures as "pixel twins" mimicking leafhopper brochosomes.
- Engineered surface morphology for controlled emissivity in the infrared and camouflage in the visible spectrum.
- Utilized self-emitting properties of metastructures upon thermal excitation.
Main Results:
- Pixel twins demonstrated distinct infrared emissivities, enabling "0-1" binary thermal states.
- Metastructures exhibited similar visible light scattering, ensuring visual indistinguishability.
- Functions are structure-dependent, not material-permittivity dependent, unlike conventional methods.
Conclusions:
- The novel binary metastructures offer a systemic solution for microscale thermal signature control.
- The technology provides visible camouflage and infrared display capabilities.
- Significant implications for optical security, anticounterfeiting, and data encryption.
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