Patent Number: 7,715,892

Title: Tunable, superconducting, surface-emitting teraherz source

Abstract: 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.

Inventors: Welp; Ulrich (Lisle, IL), Koshelev; Alexei E. (Bolingbrook, IL), Gray; Kenneth E. (Naperville, IL), Kwok; Wai-Kwong (Evanston, IL), Vlasko-Vlasov; Vitalii (Downers Grove, IL)

Assignee: Uchicago Argonne, LLC

International Classification: H01L 39/08 (20060101); G01R 33/02 (20060101); H01L 39/22 (20060101)

Expiration Date: 5/11/12018