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Type: Artigo de evento
Title: Infrared Photocurrent With One- And Two-photon Absorptions In A Double-barrier Quantum Well System
Author: Degani M.H.
Maialle M.Z.
Farinas P.F.
Studart N.
Abstract: We present a theoretical investigation of a double-barrier quantum-well infrared photodetector (QWIP) having two-color selectivity. The quantum well is placed between a pair of potential barriers in order to increase selectivity through modulation of the continuum states. This also leads to a potential decrease in the dark current. Calculations are carried in the effective-mass approximation using a single-electron hamiltonian. The approach used to obtain the photocurrent yields the observation of single as well as many-photon transitions in a unified manner, by naturally accounting for real and virtual processes through intermediate states that take part in the generation of photocurrent. The two-color selectivity of the calculated photocurrent spectra comes from both one- and two-photon transitions. The performance of the system studied is compared to the results for the isolated quantum well and the advantages of the double barrier are pointed out. © 2011 American Institute of Physics.
Rights: aberto
Identifier DOI: 10.1063/1.3662867
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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