Patent ID: 8836446
Filing Date: 2014-09-16
Classification: H03C

Abstract:
1. A wave amplitude modulator for modulating a transmitted electromagnetic wave, the modulator comprising: a substrate; a first tunable two-dimensional electron-gas layer disposed on the substrate; an insulator material disposed on the tunable two-dimensional electron-gas layer; a graphene layer configured as a second tunable two-dimensional electron-gas material disposed on the insulator material; and a power source electrically coupled to both the first and second two-dimensional electron-gas layers, wherein the power supply provides a voltage between the first and second two-dimensional electron-gas layers, wherein the applied voltage tunes the electron concentration of the two-dimensional electron-gas layers by inducing the formation of holes in one of the two-dimensional electron-gas layers, while inducing the formation of corresponding electrons in the other of the two-dimensional electron-gas layers and thereby adjusting the optical conductivity thereof, and wherein the change in the optical conductivity causes a modulation of the transmitted wave passing through the modulator.