Full-Parameter Omnidirectional Thermal Metadevices of Anisotropic Geometry

Area of Science:

• Metamaterials Science
• Thermal Engineering
• Applied Physics

Background:

• Transformation optics and scattering cancellation have enabled metamaterials for various fields, including thermotics.
• Existing transformation-based metamaterials often require approximations or exhibit directional properties, especially with anisotropic geometries.

Purpose of the Study:

• To develop a synthetic paradigm for thermal metamaterials that achieves full parameters and omnidirectionality simultaneously.
• To address the limitations of existing transformation thermotic/dc/acoustic metamaterials derived from optical counterparts.
• To experimentally demonstrate novel noncentrosymmetric thermal metadevices.

Main Methods:

• A novel synthetic methodology was employed to design and fabricate thermal metamaterials.
• The approach ensures exact parameter fulfillment and omnidirectional functionality.
• Experimental validation of noncentrosymmetric thermal metadevices was performed.

Main Results:

• A paradigm for thermal metamaterials with strictly full parameters and omnidirectionality was successfully reported.
• Demonstration of a series of noncentrosymmetric thermal metadevices.
• The methodology overcomes challenges not achievable with transformation-optic metamaterials.

Conclusions:

• The developed approach provides a rigorous, exact, and robust method for manipulating heat flow.
• This work challenges the perception of thermotic metamaterials as simple derivatives of optical ones.
• The findings open new possibilities for controlling Laplacian and wave-dynamic fields.