A highly sensitive terahertz photon detector based on a semiconductor quantum dot

Peter Kleinschmidt, Stephen P. Giblin, Alexander Tzalenchuk, Leonid Kulik, Vladimir Antonov

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We have developed a detector for photons in the terahertz region consisting of a lateral semiconductor quantum-dot (QD), defined in the two-dimensional electron gas (2-DEG) of a mesa-patterned heterostructure using three metallic gates, and a metallic single-electron transistor (SET) fabricated on top of the mesa. The SET is capacitively coupled to the QD. THz photons can be absorbed by the QD resulting in excitations associated with a change in charge-state of the QD, which can be detected directly as a change in the conductance of the SET. We characterize the detector by using radiation from a black-body emitter at the 1 K stage of our apparatus. Operation of the detector at a temperature of 300 mK is demonstrated and the noise equivalent power (NEP) is estimated to be of the order of 10-19 W/√Hz based on a dark count rate of 0.1/s and a quantum efficiency of the order of 0.1 %.

Original languageEnglish
Title of host publicationIRMMW-THz2007 - Conference Digest of the Joint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics
PublisherIEEE Computer Society
Pages736-737
Number of pages2
ISBN (Print)1424414385, 9781424414383
DOIs
Publication statusPublished - 2007
Externally publishedYes
EventJoint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics, IRMMW-THz2007 - Cardiff, United Kingdom
Duration: 3 Sep 20077 Sep 2007

Publication series

NameIRMMW-THz2007 - Conference Digest of the Joint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics

Conference

ConferenceJoint 32nd International Conference on Infrared and Millimetre Waves, and 15th International Conference on Terahertz Electronics, IRMMW-THz2007
Country/TerritoryUnited Kingdom
CityCardiff
Period3/09/077/09/07

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