Janus functional thermal metadevice with predictable thermal rotation

Abstract

The Janus thermal metadevice, which displays path-dependent functionalities, has received growing attention. However, the previous design of a metadevice with Janus features required a complex anisotropic parameter arrangement and challenging fabrication realizations, which inevitably resulted in overmuch thermal contact resistance. Using natural inclusion iteration, we present a bilayer Janus thermal metadevice with isotropic geometry and homogenous parameters that exhibit thermal concentration on the x-axis and thermal cloak on the y-axis. The proof-of-concept experimental results unambiguously demonstrate the path-dependent functionality, which was achieved by the compact bilayer structure of thermal diffusion media. Additionally, a metadevice with configurable anisotropic parameters can exhibit predictable thermal rotation functions in additional directions.