Patent ID: 8164423

Claim:
A method of detecting items with a surveillance and/or identification device, comprising the steps of: a) causing or inducing a current sufficient for the device to backscatter detectable electromagnetic radiation, the device comprising: an inductor and/or a first capacitor plate, a diode in electrical communication with the inductor and/or first capacitor plate, the diode comprising (i) a first semiconductor film having a first conductivity type and a first dopant concentration, and (ii) a second semiconductor film having a second conductivity type and a second dopant concentration, where at least one of the first conductivity type and first dopant concentration differs from the second conductivity type and second dopant concentration, respectively, a first conductor electrically connected to the diode, providing electrical communication between the diode and at least one of the inductor and/or logic circuitry, and an insulating layer between the inductor and/or the first capacitor plate and the first conductor; b) detecting the detectable electromagnetic radiation; and c) optionally, selectively deactivating the device.