Sökning: "HEB"
Visar resultat 1 - 5 av 28 avhandlingar innehållade ordet HEB.
1. NbN and NbTiN Hot Electron Bolometer THz Mixers
Sammanfattning : The thesis reports the development of Hot Electron Bolometer (HEB) mixers for radio astronomy heterodyne receivers in THz frequency range. Part of this work is the fabrication of HEB devices, which are based on NbN or NbTiN superconducting thin films (≤5 nm). They are integrated with wideband spiral or double-slot planar antennas. LÄS MER
2. Study of MgB2 and YBa2Cu3O7-x Microbolometers for THz Sensing Applications
Sammanfattning : In this thesis, two novel THz detectors based on magnesium diboride (MgB2)and yttrium barium copper oxide (YBa2Cu3O7-x) are presented. In particular,MgB2 superconductor is used for the investigation of hot-electron bolometer(HEB) mixers, while YBa2Cu3O7-x is explored in microbolometers for room-temperaturecoherent and incoherent detection. LÄS MER
3. Ultra-thin Niobium Nitride Films for Hot Electron Bolometer and THz Applications
Sammanfattning : The part of the electromagnetic spectrum between microwaves and infrared, also known as the terahertz band, is of particular interest for radio astronomy. The radiation intensity of the cold universe peaks at this frequency band, thus defining the demand on sensitive low-noise instruments in this particular frequency range. LÄS MER
4. Low and High Tc Bolometer Detectors for THz Frequencies
Sammanfattning : .... LÄS MER
5. Submillimeter Heterodyne Array for High-speed Radio Astronomy
Sammanfattning : .... LÄS MER