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The dynamics of electron capture and relaxation in an n-doped quantum-dot (QD) infrared detector structure are studied directly in the time domain using ultrafast intraband-pump-interband-probe differential transmission spectroscopy. Femtosecond midinfrared pulses are used to excite electrons from the doped QDs into the conduction band continuum, and the complete electron distribution functions are...
Time-resolved mid-infrared-pump, optical-probe differential transmission spectroscopy directly reveals electron dynamics in n-doped quantum dots infrared detector structure. Capturing and intradot relaxation time were measured. Nanosecond-scale dynamics in the n=1 state was also observed.
When the n=1 (ground) state of quantum dots is resonantly pumped, a "non-degenerate" biexciton composed of an n=1 and n=2 (excited) states-pair may be observed with pump-probe spectroscopy. We observed this resonance and measured 15-meV binding energy in In0.4Ga 0.6As self-organized quantum dots, consistent with theoretical calculations
Summary form only given. Femtosecond differential transmission (DT) spectroscopy of In/sub 0.4/Ga/sub 0.6/ quantum dots (QD) pumped resonantly with a narrow band pulse shows an extremely rapid spreading of the energy spectrum, indicating carrier coupling among dots of different sizes. This rapid spectral spread has been observed and attributed to carrier-carrier scattering in quantum well systems...
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