Rapid and robust control of single quantum dots

Light, Science & Applications
Nicolò AccantoNiek F van Hulst

Abstract

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 nanoparticles. Optimal 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 dynamics. In 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 optimized. This scheme needs long measurement times and strong signals to converge to the optimal solution. This requirement is in conflict with the nature of single emitters whose signals are weak and unstable. Here 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 laser. Crucial to the optimization loop is the use of a deterministic and robust-against-noise search algorithm converging to the theoretically predicted solution in a...Continue Reading

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Citations

Nov 30, 2018·Reports on Progress in Physics·Gary BeaneGregory V Hartland
Nov 24, 2019·The Journal of Chemical Physics·Marta RosaRoberto Cammi
Oct 23, 2018·Journal of the American Chemical Society·Kevin WilmaRichard Hildner

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Methods Mentioned

BETA
super-resolution microscopy

Software Mentioned

MIIPS

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