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US 7,610,071 B2Granted
Tunable, superconducting, surface-emitting teraherz source
AssigneeUchicago Argonne, LLC
InventorsUlrich Welp, Alexei E. Koshelev, Kenneth E. Gray, Wai-Kwong Kwok, Vitalii Vlasko-Vlasov
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Abstract
A compact, solid-state THz source based on the driven Josephson vortex lattice in a highly anisotropic superconductor such as Bi2Sr2CaCu2O8 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 Bi2Sr2CaCu2O8 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.
Claims8
A tunable terahertz device, comprising:
- a first superconducting stack having a top surface;
- a first metallic layer which is disposed on the top surface of the superconducting stack and the first metallic layer comprises a patterned grating;
- and
- a second metallic conducting layer coupled electrically to a bottom of the superconducting stack.
1 more element
Dependencies are inferred from the claim text.