TY - JOUR AU - Gao, J. R. AU - Hajenius, M. AU - Yang, Z. Q. AU - Baselmans, J. J. A. AU - Khosropanah, P. AU - Barends, R. AU - Klapwijk, T. M. PY - 2007 DA - 2007// TI - Terahertz superconducting hot electron bolometer heterodyne receivers JO - IEEE Trans. Appl. Supercond. SP - 252 EP - 258 VL - 17 IS - 2 KW - HEB KW - mixer KW - direct detection effect AB - We highlight the progress on NbN hot electron bolometer (HEB) mixers achieved through fruitful collaboration between SRON Netherlands Institute for Space Research and Delft University of Technology, the Netherlands. This includes the best receiver noise temperatures of 700 K at 1.63 THz using a twin-slot antenna mixer and 1050 K at 2.84 THz using a spiral antenna coupled HEB mixer. The mixers are based on thin NbN films on Si and fabricated with a new contact-process and-structure. By reducing their areas HEB mixers have shown an LO power requirement as low as 30 nW. Those small HEB mixers have demonstrated equivalent sensitivity as those with large areas provided the direct detection effect due to broadband radiation is removed. To manifest that a HEB based heterodyne receiver can in practice be used at arbitrary frequencies above 2 THz, we demonstrate a 2.8 THz receiver using a THz quantum cascade laser (QCL) as local oscillator. SN - 1051-8223 UR - http://ieeexplore.ieee.org/lpdocs/epic03/wrapper.htm?arnumber=4277405 UR - https://doi.org/10.1109/TASC.2007.898066 DO - 10.1109/TASC.2007.898066 N1 - exported from refbase (https://db.rplab.ru/refbase/show.php?record=557), last updated on Sun, 22 May 2016 16:02:04 -0500 ID - Gao_etal2007 ER -