Phys. Rev. Lett. 95, 017403 (2005) [4 pages]Microscopic Measurement of Photon Echo Formation in Groups of Individual Excitonic TransitionsReceived 3 February 2005; published 30 June 2005 The third-order polarization emitted from groups of individual localized excitonic transitions after pulsed optical excitation is measured. We observe the evolution of the nonlinear response from the case of a free polarization decay for a single transition, to that of a photon echo for many transitions. The echo is shown to arise from the mutual rephasing of the emission from individual transitions. © 2005 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.017403
DOI:
10.1103/PhysRevLett.95.017403
PACS:
78.47.+p, 42.65.Re, 78.66.Fd, 78.67.Hc
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