Quantum noise in a terahertz hot electron bolometer mixer

Journal article (2010)
Department
Kavli Institute of Nanoscience (AS) (TU Delft)
Copyright: © 2010 The Author(s); American Institute of Physics
DOI: https://doi.org/doi:10.1063/1.3364936
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Published Date

19-03-2010

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Source:

Applied Physics Letters, 96 (11), 2010

Faculty

Applied Sciences

Department

Kavli Institute of Nanoscience

Abstract

We have measured the noise temperature of a single, sensitive superconducting NbN hot electron bolometer (HEB) mixer in a frequency range from 1.6 to 5.3 THz, using a setup with all the key components in vacuum. By analyzing the measured receiver noise temperature using a quantum noise (QN) model for HEB mixers, we confirm the effect of QN. The QN is found to be responsible for about half of the receiver noise at the highest frequency in our measurements. The ?-factor (the quantum efficiency of the HEB) obtained experimentally agrees reasonably well with the calculated value.

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