Sensing individual terahertz photons

Hideomi Hashiba, Vladimir Antonov, Leonid Kulik, Alexander Tzalenchuk, Susumu Komiyama

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


One of the promising ways to perform single-photon counting of terahertz radiation consists in sensitive probing of plasma excitation in the electron gas upon photon absorption. We demonstrate the ultimate sensor operating on this principle. It is assembled from a GaAs/AlGaAs quantum dot, electron reservoir and superconducting single-electron transistor. The quantum dot is isolated from the surrounding electron reservoir in such a way that when the excited plasma wave decays, an electron could tunnel off the dot to the reservoir. The resulting charge polarization of the dot is detected with the single-electron transistor. Such a system forms an easy-to-use sensor enabling single-photon counting in a very obscure wavelength region.

Original languageEnglish
Article number165203
Issue number16
Publication statusPublished - 2010
Externally publishedYes


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