Experimental Realization of a Broadband Dynamically Adaptive Microfluidics-Enabled Camouflage Cloak via Multi-Physics Coupled Analysis

Electromagnetic camouflage has attracted significant academic interest and extensive discussion. Compared to transformation optics cloaks, metasurface cloaks have become the prevailing approach due to their superior ability to manipulate electromagnetic waves and their ease of fabrication. However, existing dynamic camouflage active cloaks are constrained by narrow bandwidths resulting from the nonlinear effects of lumped elements, presenting significant challenges for effective concealment under broadband detection systems. To overcome this challenge, a novel quasi-3D microfluidic dynamic camouflage cloak based on multi-physical field analysis and integration of solid and liquid metals is proposed, which can not only camouflage different real objects in the broadband range but also achieve complete filling and fast switching of large-scale two-phase microfluidics. The electromagnetic and fluidic properties of the designed cloak are validated by experiments, which agree very well with numerical simulations. This work presents a feasible broadband dynamic camouflage strategy, which is closer to practical applications, and provides unprecedented potential for near-field and far-field regulation of broadband electromagnetic waves.