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Rapid and robust control of single quantum dots

Light(Science & Applications) 2016年第1期5卷 143-149页

作者： Nicolò Accanto pablo M de Roque Marcial Galvan-Sosa Sotirios Christodoulou Iwan Moreels Niek F van Hulst ICFO-Institut de Ciencies Fotoniques The Barcelona Institute of Science and Technology08860 Castelldefels(Barcelona)Spain Instituto deÓptica-CSIC 28006 MadridSpain Istituto Italiano di Tecnologia 16163 GenovaItaly Department of Physics University of Genova16146 GenovaItaly ICREA-InstitucióCatalana de Recerca i Estudis avançats 08010 BarcelonaSpain

The combination of single particle detection and ultrafast laser pulses is an instrumental method to track dynamics at the femtosecond time scale in single molecules,quantum dots and plasmonic *** control of the extremely short-lived coherences of these individual systems has so far remained elusive,yet its successful implementation would enable arbitrary external manipulation of otherwise inaccessible nanoscale *** ensemble measurements,such control is often achieved by resorting to a closed-loop optimization strategy,where the spectral phase of a broadband laser field is iteratively *** scheme needs long measurement times and strong signals to converge to the optimal *** requirement is in conflict with the nature of single emitters whose signals are weak and *** we demonstrate an effective closed-loop optimization strategy capable of addressing single quantum dots at room temperature,using as feedback observable the two-photon photoluminescence induced by a phase-controlled broadband femtosecond *** to the optimization loop is the use of a deterministic and robust-against-noise search algorithm converging to the theoretically predicted solution in a reduced amount of steps,even when operating at the few-photon *** optimization of the single dot luminescence is obtained within~100 trials,with a typical integration time of 100 ms per *** times are faster than the typical photobleaching times in single molecules at room *** results show the suitability of the novel approach to perform closed-loop optimizations on single molecules,thus extending the available experimental toolbox to the active control of nanoscale coherences.

关键词： closed-loop control coherent control single quantum dot two-photon luminescence ultrafast

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