Encrypted Thermal Printing with Regionalization Transformation

Artificially structured thermal metamaterials provide an unprecedented possibility of molding heat flow that is drastically distinct from the conventional heat diffusion in naturally conductive materials. The Laplacian nature of heat conduction makes the transformation thermotics, as a design princi...

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Bibliographic Details
Published in:Advanced materials (Weinheim) Vol. 31; no. 25; pp. e1807849 - n/a
Main Authors: Hu, Run, Huang, Shiyao, Wang, Meng, Luo, Xiaobing, Shiomi, Junichiro, Qiu, Cheng‐Wei
Format: Journal Article
Language:English
Published: Germany Wiley Subscription Services, Inc 01.06.2019
Subjects:
Concentrators
Conduction heating
Conductive heat transfer
Distribution functions
Encryption
Heat distribution
Heat transmission
illusion thermotics
Illusions
Infrared imagery
Infrared signatures
Materials science
Metamaterials
Natural lighting
regionalization transformation
thermal metamaterials
thermal printing
Thermal transformations
thermal metamaterials
regionalization transformation
thermal printing
illusion thermotics
ISSN:0935-9648, 1521-4095, 1521-4095
Online Access:Get full text
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Summary:Artificially structured thermal metamaterials provide an unprecedented possibility of molding heat flow that is drastically distinct from the conventional heat diffusion in naturally conductive materials. The Laplacian nature of heat conduction makes the transformation thermotics, as a design principle for thermal metadevices, compatible with transformation optics. Various functional thermal devices, such as thermal cloaks, concentrators, and rotators, have been successfully demonstrated. How far can it possible go beyond just realizing a heat‐distribution function in a thermal metadevice? Herein, the concept of encrypted thermal printing is proposed and experimentally validated, which could conceal encrypted information under natural light and present static or dynamic messages in an infrared image. Regionalization transformation is developed for structuring thermal metamaterial‐strokes as infrared signatures, enabling letters of the alphabet to be written, paintings to be drawn, movies to be made, and information to be displayed. This strategy successfully demonstrates an extreme level of manipulation of heat flow for encryption, illusions, and messaging. Heat conduction has long been considered in an omnidirectional diffusive way. Such a stereotype is successfully broken in this work and extreme heat flow manipulation is achieved, based on which encrypted thermal printing and regionalization transformation for structuring thermal metamaterial‐strokes as infrared signatures are proposed, enabling the writing of letters, the drawing of paintings, and the display of information.
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ISSN:0935-9648
1521-4095
1521-4095
DOI:10.1002/adma.201807849