Ultra-sensitive hot-electron nanobolometers for THz astrophysics

Boris S. Karasik, Sergey V. Pereverzev, Jian Wei, David Olaya, Michael Gershenson, Andrei V. Sergeev, Robin Cantor

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The background-limited spectral imaging of the early Universe requires terahertz (THz) detectors with the sensitivity 2-3 orders of magnitude better than that of the state-of-the-art bolometers. To realize this sensitivity without sacrificing the operating speed, the sensing element of a bolometric detector should have an exceptionally high thermal isolation from the environment combined with an ultrasmall heat capacity. We have demonstrated that this goal can be achieved by realizing a superconducting hot-electron nanobolometer whose design blocks photon and phonon energy exchange through its contact leads. The remaining coupling due to electron-phonon interaction provides thermal control at a level of one thousandth of the quantum of thermal conductance GQ ≈ 1 [pW/K] x T. These hot-electron nanobolometers with a heat capacity of ∼ 0.1 aJ/K will be sufficiently sensitive for registration of single THz photons. These devices are very promising for submillimeter astronomy and other applications based on quantum calorimetry and photon counting.

Original languageEnglish (US)
Title of host publication33rd International Conference on Infrared and Millimeter Waves and the 16th International Conference on Terahertz Electronics, 2008, IRMMW-THz 2008
DOIs
StatePublished - Dec 31 2008
Event33rd International Conference on Infrared and Millimeter Waves and the 16th International Conference on Terahertz Electronics, 2008, IRMMW-THz 2008 - Pasadena, CA, United States
Duration: Sep 15 2008Sep 19 2008

Other

Other33rd International Conference on Infrared and Millimeter Waves and the 16th International Conference on Terahertz Electronics, 2008, IRMMW-THz 2008
CountryUnited States
CityPasadena, CA
Period9/15/089/19/08

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Fingerprint Dive into the research topics of 'Ultra-sensitive hot-electron nanobolometers for THz astrophysics'. Together they form a unique fingerprint.

Cite this