Superconducting microbridges in delft

Research in our group is concentrated on superconducting microbridges. Basic properties of bridges as well as the possible application as detectors of (sub) millimeter radiation are investigated. Specific projects discussed in this paper are: a) Ginzburg-Landau calculations on two- and three-dimensional constrictions, Ic(T), Is(φ), ψ(x). b) experimental investigations of basic properties of microbridges such as critical currents for various geometries and materials, regimes at finite voltages, thermal properties. c) mutual influence of microbridges close together on the same metal film. d) fabrication of variable thickness niobium bridges suitable for submillimeter detection. e) antenna design for optimum coupling of radiation field into weak link.