> ... We thus attribute our light-based signal injection results to mechanical movements of the microphone’s diaphragm, which are in turn translated to output v

> ... We thus attribute our light-based signal injection results to mechanical movements of the microphone’s diaphragm, which are in turn translated to output voltage by the microphone’s internal circuitry. Aside from the security aspect, this is a pretty cool example of applied physics. The paper doesn't appear to report anything else on this effect, but AFAICT, it's new. The Wired story described two hypotheses, one of which involved the laster heating the air immediately above the microphone, simulating a sound wave as the light amplitude is modulated.