Accession Number : ADA337284

Title :   High-Frequency Properties of Two-Dimensional Josephson-Junction Arrays

Descriptive Note : Final rept. 1 Nov 94-31 Dec 97

Corporate Author : MARYLAND UNIV COLLEGE PARK

Personal Author(s) : Lobb, Christopher J.

PDF Url : ADA337284

Report Date : FEB 1998

Pagination or Media Count : 8

Abstract : Niobium Josephson junction arrays show great promise as compact, low dissipation, efficient sources of electromagnetic radiation at frequencies from below 100 GHz to as high as 1 THz. Current small resistively shunted arrays (containing 100 phase locked junctions) are tunable over a broad range and produce power which is within a factor of 3 the theoretical maximum. Unshunted arrays have also been made which are not tunable, but produce very narrow linewidth radiation with remarkably high efficiency (conservatively estimated at 15% from DC to 157 GHz). In addition, a new scanning probe, based on SQUIDs (Superconducting QUantum Interference Devices) has been designed and constructed, and is not in operation, yielding spatial images of the magnetic field distribution in arrays.

Descriptors :   *QUANTUM ELECTRONICS, *JOSEPHSON JUNCTIONS, MAGNETIC FIELDS, TUNNELING(ELECTRONICS), DAMPING, NIOBIUM, HIGH TEMPERATURE SUPERCONDUCTORS, SUPERCONDUCTIVITY, PHASE LOCKED SYSTEMS, ELECTRIC SHUNTS.

Subject Categories : Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE