Condensed Matter Physics Seminar

Dr V.N. Antonov, Physics Department, Royal Holloway University of London

Friday 12 December 2014, 1500-1600
C1 Physics Building

Technology of terahertz quantum dot detectors and their applications

One of the successful direct terahertz detectors relies on excitation and registration of plasma waves in semiconductor 2DEG and quantum dots. A single-photon detection sensitivity can be achieved at low temperatures. The specific feature of the detector is a spectral sensitivity owing to the plasma resonances in the quantum dot or patterned 2DEG. In order to demonstrate this, we detect cyclotron radiation emitted by the Hall bar in a magnetic field, and coherent radiation of biased HTS Josephson Junctions. Despite remarkable spectroscopic and sensitivity characteristics demonstrated at low temperatures, there are still substantial difficulties on the way to translating the detector performance to room temperature operation. I will briefly discuss the current state of research related to terahertz imaging to summarise the talk.