Input Bandwidth of Hot Electron Bolometer With Spiral Antenna
Terahertz Science and Technology, IEEE Transactions(2012)
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.
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Key words
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,hot electron bolometer (heb),terahertz (thz) region,temperature measurement,ultra wideband,spirals,terahertz,antenna measurement,antennas,bandwidth
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