Title :
Ultrafast near-field spectroscopy of single quantum dots
Author :
Guenther, Thomas ; Mueller, Klaus ; Lienau, Christoph ; Elsaesser, Thomas ; Eshlaghi ; Wieck, A.
Author_Institution :
Max-Born-Inst. fur Nichtlineare Opt. und Kurzzeitspektroskopie, Berlin, Germany
Abstract :
Summary form only given. We report the first ultrafast study of the nonlinear optical response of single quantum dots (QD). We demonstrate that transient differential reflectivity spectra show pronounced oscillatory structures around the ground state QD absorption resonance. These oscillations persist up to negative delay times of more than 10 ps and reflect the perturbed free induction decay of the coherent polarization of a single exciton. We investigate excitons localized at interface fluctuations of a single 5.1 nm [100] GaAs QW. Differential reflectivity spectra are recorded as a function of pump-probe delay.
Keywords :
III-V semiconductors; excitons; gallium arsenide; optical coherent transients; photoluminescence; reflectivity; semiconductor quantum dots; time resolved spectra; GaAs; PL spectra; differential reflectivity spectra; interface fluctuations; localized excitons; negative delay times; nonlinear optical response; perturbed free induction decay; polarization scattering; pump-probe delay; single exciton emission peaks; single quantum dots; spectrally sharp resonances; thin quantum wells; transient differential reflectivity spectra; ultrafast near-field spectroscopy; Excitons; Gallium compounds; Optical reflection; Photoluminescence; Quantum dots;
Conference_Titel :
Quantum Electronics and Laser Science Conference, 2002. QELS '02. Technical Digest. Summaries of Papers Presented at the
Conference_Location :
Long Beach, CA, USA
Print_ISBN :
1-55752-708-3
DOI :
10.1109/QELS.2002.1031250
