Terahertz radiation mixer

United States Patent

May 20, 2008
View the Complete Patent at the US Patent & Trademark Office
Direct Detector for Terahertz Radiation
A terahertz radiation mixer comprises a heterodyned field-effect transistor (FET) having a high electron mobility heterostructure that provides a gatable two-dimensional electron gas in the channel region of the FET. The mixer can operate in either a broadband pinch-off mode or a narrowband resonant plasmon mode by changing a grating gate bias of the FET. The mixer can beat an RF signal frequency against a local oscillator frequency to generate an intermediate frequency difference signal in the microwave region. The mixer can have a low local oscillator power requirement and a large intermediate frequency bandwidth. The terahertz radiation mixer is particularly useful for terahertz applications requiring high resolution.
Wanke; Michael C. (Albuquerque, NM), Allen; S. James (Santa Barbara, CA), Lee; Mark (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
April 25, 2005
455/189.1 ; 257/19; 257/192; 257/270; 257/E29.091; 257/E29.249; 455/209; 455/293; 455/331; 455/333;
H04B 1/18 (20060101);
455/189.1,209,293,331,333 358/180 257/19,192,270
STATEMENT OF GOVERNMENT INTEREST This invention was made with Government support under contract no. DE-AC04-94AL85000 awarded by the U.S. Department of Energy to Sandia Corporation. The Government has certain rights in the invention.