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Quantum noise in a terahertz hot electron bolometer mixer

W. Zhang ; P. Khosropanah ; J. R. Gao ; Erik L. Kollberg (Institutionen för mikroteknologi och nanovetenskap, Fysikalisk elektronik) ; K. S. Yngvesson ; T. Bansal ; R. Barends ; T. M. Klapwijk
Applied Physics Letters (0003-6951). Vol. 96 (2010), 11, p. 111113 .
[Artikel, refereegranskad vetenskaplig]

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 beta-factor (the quantum efficiency of the HEB) obtained experimentally agrees reasonably well with the calculated value.

Nyckelord: bolometers, millimetre wave mixers, quantum noise



Denna post skapades 2010-04-23. Senast ändrad 2015-07-09.
CPL Pubid: 120266

 

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Institutioner (Chalmers)

Institutionen för mikroteknologi och nanovetenskap, Fysikalisk elektronik (2007-2010)

Ämnesområden

Elektroteknik och elektronik

Chalmers infrastruktur