DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Technology and Performance of THz Hot-Electron Bolometer Mixers

Ilin, Konstantin and Stockhausen, Axel and Scheuring, A and Siegel, Michael and Semenov, Alexej and Richter, Heiko and Hübers, H.-W. (2009) Technology and Performance of THz Hot-Electron Bolometer Mixers. IEEE Transactions on Applied Superconductivity, 19 (3-1), pp. 269-273. IEEE - Institute of Electrical and Electronics Engineers.

Full text not available from this repository.

Official URL: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5153030&isnumber=5166641


Hot-Electron Bolometer (HEB) mixers are a complex multi-layer thin film structure containing an ultra-thin superconducting film of NbN as a detecting element and a thick normal metal layer as an antenna structure. We have optimized the fabrication process starting with ultra-thin NbN films, Au films for antenna structures and their patterning using e-beam lithography and lift-off. The coupling between normal conducting antenna and NbN detector has been improved by introducing an intermediate NbN film to reduce proximity suppression of superconductivity in the detecting element. A critical temperature of about 9.5 K is reached for NbN films with a thickness between 5 nm and 6 nm. A twofold increase of the film thickness increases the critical temperature to 12 K.We have shown that a 20 nm thick buffer layer of NbN under a much thicker Au layer is sufficient to ensure a critical temperature of the bi-layer of 9 K. This value is close to the critical temperature of 5.5 nm thick HEB devices. The noise temperature of HEB mixer made using improved technology is about 800 K and was measured in a liquid cryogen free system with a quantum cascade laser as 2.5 THz local oscillator.

Item URL in elib:https://elib.dlr.de/60350/
Document Type:Article
Title:Technology and Performance of THz Hot-Electron Bolometer Mixers
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Ilin, KonstantinUniversity of KarlsruheUNSPECIFIEDUNSPECIFIED
Stockhausen, AxelUniversität KarlsruheUNSPECIFIEDUNSPECIFIED
Scheuring, AUniversität KarlsruheUNSPECIFIEDUNSPECIFIED
Siegel, MichaelUniversität KarlsruheUNSPECIFIEDUNSPECIFIED
Date:June 2009
Journal or Publication Title:IEEE Transactions on Applied Superconductivity
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:pp. 269-273
Publisher:IEEE - Institute of Electrical and Electronics Engineers
Keywords:Niobium nitride, proximity effect, superconducting hot-electron bolometer detector, THz mixer
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Traffic Management (old)
DLR - Research area:Transport
DLR - Program:V VM - Verkehrsmanagement
DLR - Research theme (Project):V - FAMOUS (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Deposited By: Semenov, Prof.Dr. Alexey
Deposited On:02 Nov 2009 14:00
Last Modified:06 Sep 2019 15:18

Repository Staff Only: item control page

Help & Contact
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.