Engineers develop flexible skin that traps radar waves, cloaks objects →

"The long-term goal is to shrink the size of these devices," Dong said. "Then hopefully we can do this with higher-frequency electromagnetic waves such as visible or infrared light. While that would require advanced nanomanufacturing technologies and appropriate structural modifications, we think this study proves the concept of frequency tuning and broadening, and multidirectional wave suppression with skin-type metamaterials."

So it doesn't yet work on visible light but it seems like given the Time to retrofit all those Predator and Reaper UAVs...