Title :
Tunable terahertz amplification in optically-excited biased semiconductor superlattices
Author :
Wang, Dawei ; Zhang, Aizhen ; Yang, Lijun ; Dignam, Marc M.
Author_Institution :
Dept. of Phys., Queen´´s Univ., Kingston, ON
Abstract :
We simulate the coherent carrier dynamics of an optically-excited, updoped AlGaAs superlattice in the presence of a Terahertz pulse using an excitonic formalism that includes 1s excitonic states as well as higher in-plane excited states and allows for dephasing and population decay. We show that this system exhibits large tunable terahertz gain due to excitonic effects, even in the presence of large number of unbound excitons.
Keywords :
III-V semiconductors; aluminium compounds; excitons; gallium arsenide; quantum well lasers; semiconductor superlattices; AlGaAs; coherent carrier dynamics; excitonic formalism; in-plane excited states; optically-excited biased semiconductor superlattices; tunable terahertz amplification; unbound excitons; Excitons; Frequency; Nonlinear optics; Optical pulses; Optical superlattices; Quantum cascade lasers; Semiconductor superlattices; Stimulated emission; Tunable circuits and devices; Ultrafast optics; (190.5970) Semiconductor nonlinear optics including MQW; (300.6495) Spectroscopy, teraherz; (320.7130) Ultrafast processes in condensed matter, including semiconductors;
Conference_Titel :
Lasers and Electro-Optics, 2008 and 2008 Conference on Quantum Electronics and Laser Science. CLEO/QELS 2008. Conference on
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-55752-859-9
