INTERFEROMETRIC COMMUNICATION
In accordance with embodiments of the present invention, an interferometric communication system (20) used for a security card is disclosed. The system includes a fabry-perot microelectromechanical system (MEMS) array (10) and a controller (201) configured to drive the MEMS array to form at least one security-related image. The fabry-perot MEMS array forms a checkerboard image having bright cells (100, 102, 104, 106, 108) interspersed with dark cells (101, 103, 105, 107), which modulate the intensity of light that is transmitted or reflected.