# Broadband Achromatic Programmable Electromagnetic Camouflage via Fluidic‐Accessible Metasurface

## TL;DR

A new metasurface design enables dynamic, broadband electromagnetic camouflage by using liquid metal to create programmable illusions of objects like aircraft and tanks.

## Contribution

The Fluidic-Accessible Metasurface (FAM) introduces a novel approach to broadband and reconfigurable electromagnetic camouflage using fluidic reconfiguration.

## Key findings

- The FAM metasurface achieves stable scattering hotspots across a 9–14 GHz bandwidth.
- It dynamically reconstructs illusionary contours of various targets without degradation during reconfiguration.
- Experimental results confirm reliable and repeatable performance in electromagnetic camouflage.

## Abstract

Broadband and reconfigurable illusion camouflage remains a major challenge in electromagnetic wave manipulation, as it imposes concurrent demands for precise dispersion control together with reliable real‐time switching across wide frequency ranges. Existing metasurface cloaks typically suffer from narrow bandwidths and limited adaptability, rendering them unsuitable for dynamic radar detection scenarios. Herein, we propose and experimentally demonstrate a Fluidic‐Accessible Metasurface (FAM) that overcomes these limitations by enabling programmable electromagnetic illusions through focal‐spot encoding. The supercells are designed with strong dispersion control and achromatic focusing capabilities, thereby generating stable scattering hotspots from the radar perspective. Through the assembly and fluidic reconfiguration of these supercells, the FAM dynamically reconstructs the illusionary contours of diverse targets, such as aircraft, drones, and tanks, within an ultrawide operational bandwidth of 9–14 GHz. Experimental near‐field measurements, in agreement with full‐wave simulations, verify reliable and repeatable illusion camouflage states without leakage or degradation during fluidic reconfiguration. This strategy, therefore, unifies broadband operation, dynamic programmability, high adaptability, and structural robustness, directly addressing the key limitations of existing metasurface cloaks. This work establishes a versatile platform for programmable electromagnetic illusions, enabling the practical deployment of next‐generation intelligent metasurface camouflage systems.

A fluidic access metasurface enables dynamic, broadband electromagnetic illusions. By physically reconstructing conductive patterns with liquid metal, the metasurface achieves real‐time, pixel‐level control over phase dispersion. This allows for the programmable generation of arbitrary strong scattering point arrays, effectively deceiving high‐resolution radar systems with convincing phantom targets.