Patent ID: 7889015
Filing Date: 2011-02-15
Classification: B82Y,H01S

Abstract:
1. An oscillation device for oscillating an electromagnetic wave having a frequency selected from a frequency region from 30 GHz to 30 THz, comprising: a first negative permittivity medium of which a real part of permittivity with respect to the electromagnetic wave is negative; a second negative permittivity medium of which a real part of permittivity with respect to the electromagnetic wave is negative; a gain medium sandwiched between the first negative permittivity medium and the second negative permittivity medium, and having a gain with respect to the electromagnetic wave; a cavity structure for resonating the electromagnetic wave; a drive electrode for injecting carriers into the gain medium to drive the gain medium; and a control electrode to change thickness of a depletion region formed between at least one of the first and second negative permittivity media and the gain medium for controlling oscillation wavelength, wherein the control electrode is configured to apply an electric potential independently of the drive electrode.