Flexible and tunable infrared emissivity material platform
AssigneeThe Regents of the University of California
InventorsJunqiao Wu, Kechao Tang
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Abstract
A material platform with controllable emissivity and fabrication methods are provided that permit the manipulation of thermal radiation detection and IR signal modulation and can be adapted to a variety of uses including infrared camouflage, thermal IR decoys, thermo-reflectance imaging and IR signal modulation. The platform is a multilayer WxV1-xO2 film with different W doping levels (x values) and layer thicknesses, forming a graded W-doped construct. In WVO2 films with a total thickness <100 nm, the graded doping of W spreads the originally sharp metal-insulator phase transition (MIT) to a broad temperature range, greatly expanding the temperature window for emissivity modulation.
Claims7
A controllable emissivity film, comprising a composite of multiple WVO2 thin film layers with graded W doping, each of said layers having a thickness and a dopant percentage and a total thickness of 100 nm or less, wherein said multiple film layers have progressively increasing thicknesses from a top surface to a bottom surface of said composite WVO2 thin film.
Dependencies are inferred from the claim text.