Wavelength and polarization selective multi-band tunnelling quantum dot detectors

• Autorzy: Perera A. G. U. , Ariyawansa G. , Apalkov V. M. , Matsik S. G. , Su X. H. , Chakrabarti S. , Bhattacharya P.
• Języki publikacji: EN

Abstrakty

EN

The reduction of the dark current without reducing the photocurrent is a considerable challenge is developing far-infrared (FIR)/terahertz detectors. Since quantum dot (QD) based detectors inherently show low dark current, a QD-based structure is an appropriate choice for terahertz detectors. The work reported here discusses multi-band tunnelling quantum dot infrared photo detector (T-QDIP) structures designed for high temperature operation covering the range from mid- to far-infrared. These structures grown by molecular beam epitaxy consist of a QD (InGaAs or InAlAs) placed in a well (GaAs/AlGaAs) with a double-barrier system (AlGaAs/InGaAs/AlGaAs) adjacent to it. The photocurrent, which can be selectively collected by resonant tunnelling, is generated by a transition of carriers from the ground state in the QD to a state in the well coupled with a state in the double-barrier system. The double-barrier system blocks the majority of carriers contributing to the dark current. Several important properties of T-QDIP detectors such as the multi-colour (multi-band) nature of the photoresponse, the selectivity of the operating wavelength by the applied bias, and the polarization sensitivity of the response peaks, are also discussed.

Słowa kluczowe

EN

multi-band; IR detectors; quantum dot; resonant tunnelling; polarization

• Wydawca: Stowarzyszenie Elektryków Polskich ; Polska Akademia Nauk ; Wojskowa Akademia Techniczna im. Jarosława Dąbrowskiego
• Czasopismo: Opto-Electronics Review
• Rocznik: 2007
• Tom: Vol. 15, No. 4
• Strony: 223--228
• Opis fizyczny: Bibliogr. 16 poz., tab., wykr.

Twórcy

autor

Perera A. G. U.

autor

Ariyawansa G.

autor

Apalkov V. M.

autor

Matsik S. G.

autor

Su X. H.

autor

Chakrabarti S.

autor

Bhattacharya P.

• Department of Physics and Astronomy, Georgia State University, Atlanta, GA 30303, USA,

Bibliografia

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