Detection of terahertz radiation by hot electron effects in coupled quantum well photodiodes

Autor:	Robin J. Nicholas, C. T. Foxon, Siu Ling Wong, J.G. Michels, R. J. Stone, A. M. Fox
Rok vydání:	2016
Předmět:	Photocurrent Physics Physics and Astronomy (miscellaneous) business.industry Terahertz radiation Context (language use) Terahertz spectroscopy and technology Photodiode law.invention Optics law Optoelectronics business Absorption (electromagnetic radiation) Quantum well Visible spectrum
Zdroj:	Scopus-Elsevier ResearcherID
Popis:	Detection of continuous‐wave terahertz (THz) radiation has been demonstrated in GaAs/AlGaAs coupled quantum well p‐i‐n photodiodes by intrasubband absorption. The sharp interwell tunneling resonances observed in the photocurrent are highly sensitive to temperature, and the carrier temperature increase caused by the absorption of THz radiation is found to affect the photocurrent in a qualitatively similar manner. We find that the effect results in detectivities of THz radiation around 1 mA/W for a photocurrent signal of 100 nA. We discuss the functionality of our device in the context of an ‘‘optical/THz mixer,’’ where the mixing occurs between the modulation frequencies of the applied THz and visible light fields.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fa5168611b1dbcbdf973a2eb61899447 https://ora.ox.ac.uk/objects/uuid:f61965b4-8c24-447f-abd7-17fae868bcde Zobrazit plný text záznamu