Kavli Affiliate: Zhuo Li
| First 5 Authors: Yibai Zhong, Xiu Liu, Zexiao Wang, Tianyi Huang, Jingyi Zou
| Summary:
Thermal signatures represent ubiquitous infrared appearances of objects,
carrying their unique spectral fingerprints. Despite extensive efforts to
decipher and manipulate thermal-infrared signals, the ability to fully control
them across spatial, temporal and spectral domains remains a significant
challenge due to the slow speed, diffuse and broadband emitting nature of
thermal emission in most materials. Here, we demonstrate a reconfigurable
ultrafast thermal metamaterial pixel array that integrates active metasurfaces
with dual-gate graphene transistors (Gr-FETs). The Gr-FETs with dual-gate
control in each pixel achieve the heater-switch dual functionalities. As
broadband transparent microheaters, Gr-FETs support the arbitrary design of
integrated metasurfaces to achieve multi-color, narrowband infrared emission
and operate at ultrafast modulation speeds. Concurrently as electrical
switches, they enable a unified control scheme for pixel arrays of various
sizes over large areas without compromising emission intensity. By decoupling
the thermal generation and emission design processes, our approach provides an
unprecedented degree of flexibility in programming thermal output across space,
time, and wavelength. Our fabricated thermal pixel array experimentally
demonstrated 26 alphabetical letters by applying progressive scanning, thus
paving the way for practical realization of universal thermal signature
controls for advanced thermal-infrared applications.
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