Title :
Input Bandwidth of Hot Electron Bolometer With Spiral Antenna
Author :
Shurakov, Alexander ; Seliverstov, Sergey ; Kaurova, Natalia ; Finkel, Matvey ; Voronov, Boris ; Goltsman, Gregory
Author_Institution :
Moscow State Pedagogical Univ., Moscow, Russia
fDate :
7/1/2012 12:00:00 AM
Abstract :
We report the results of our study of the input bandwidth of hot electron bolometers (HEB) embedded into the planar log-spiral antenna. The sensitive element is made of the ultrathin superconducting NbN film patterned as a bridge at the feed of the antenna. The contacts between the antenna and a sensitive element are made from in situ deposited gold (i.e., deposited over NbN film without breaking vacuum), which gives high quality contacts and makes the response of the HEB at higher frequencies less affected by the RF loss. An accurate experimental spectroscopic procedure is demonstrated that leads to the confirmation of the wide ( 8 THz) bandwidth in this antenna coupled device.
Keywords :
bolometers; gold; planar antennas; spiral antennas; superconducting thin films; ultra wideband antennas; Au-NbN; HEB; NbN; RF loss; antenna coupled device; hot electron bolometer; planar log spiral antenna; spectroscopic procedure; ultrathin superconducting NbN film; Antenna measurements; Antennas; Bandwidth; Bolometers; Frequency measurement; Spirals; Temperature measurement; Hot electron bolometer (HEB); terahertz (THz) region; ultra wideband antennas;
Journal_Title :
Terahertz Science and Technology, IEEE Transactions on
DOI :
10.1109/TTHZ.2012.2194852