Kavli Affiliate: Zhuo Li
| First 5 Authors: Zhuo Li, Lin Wang, Xiu Liu, Jiayu Li, Hyeong Seok Yun
| Summary:
In nature, nano/micro-structured materials are adopted by various species to
generate colors or achieve camouflage. Here, inspired by leafhopper-generated
brochosomes, we design binary metastructures composed of pixel twins to achieve
pixelated thermal signature control at the microscale. In the infrared range,
the pixel twins exhibit distinct emissivities, creating thermal counterparts of
‘0-1’ binary states for storing and displaying information. In the visible
range, the engineered surface morphology of the pixel twins enables similar
scattering behaviors, rendering the pixel twins visually indistinguishable,
which achieves the camouflage of stored information. Compared to the previous
work based on plasmonic holographic metasurfaces, the brochosome-like pixel
twins are thermally driven, and their structure-enabled functions do not rely
on permittivities of any specific material. The unique combination of visible
camouflage and infrared display provides a systemic solution to the spatial
control of thermal signatures, and has important implications for optical
security, anticounterfeiting, and data encryption.
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