Squid-inspired camo may help US troops vanish from sight and sensors

Researchers at the University of California, Irvine, in collaboration with the Marine Biological Laboratory, have uncovered the detailed cellular architecture behind the longfin inshore squid’s ability to rapidly shift its skin from transparent to vividly colored. Using holotomography, a 3-D imaging technique, they visualized the iridophores—specialized cells containing coiled protein columns called reflectin—that act as natural Bragg reflectors to finely control light reflection and scattering. This discovery provides the most detailed explanation yet of how squid achieve dynamic color modulation by twisting and packing these nano-scale reflectin columns. Building on these biological insights, the team engineered a bio-inspired, stretchable composite material that mimics and even extends the squid’s optical capabilities. This flexible film integrates nanocolumnar Bragg reflectors with ultrathin metal layers to enable tunable camouflage across visible and infrared wavelengths. The material dynamically adjusts its appearance in response to mechanical deformation or environmental changes, making it promising for adaptive military camouflage, multispectral