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Tunable, superconducting, surface-emitting teraherz source

United States Patent

October 27, 2009
View the Complete Patent at the US Patent & Trademark Office
A compact, solid-state THz source based on the driven Josephson vortex lattice in a highly anisotropic superconductor such as Bi.sub.2Sr.sub.2CaCu.sub.2O.sub.8 that allows cw emission at tunable frequency. A second order metallic Bragg grating is used to achieve impedance matching and to induce surface emission of THz-radiation from a Bi.sub.2Sr.sub.2CaCu.sub.2O.sub.8 sample. Steering of the emitted THz beam is accomplished by tuning the Josephson vortex spacing around the grating period using a superimposed magnetic control field.
Welp; Ulrich (Lisle, IL), Koshelev; Alexei E. (Bolingbrook, IL), Gray; Kenneth E. (Evanston, IL), Kwok; Wai-Kwong (Evanston, IL), Vlasko-Vlasov; Vitalii (Downers Grove, IL)
UChicago Argonne, LLC (Chicago, IL)
11/ 728,615
March 27, 2007
The United States Government has certain rights in this invention pursuant to Contract No. DE-AC02-06CHI1357 between the United States Department of Energy and UChicago Argonne, LLC as operator of Argonne National Laboratories.