Ultrashort Pulses for Far-Field Nanoscopy

Patrick Maurer, J. Ignacio Cirac, and Oriol Romero-Isart
Phys. Rev. Lett. 117, 103602 – Published 29 August 2016

Abstract

We show that ultrashort pulses can be focused, in a particular instant, to a spot size given by the wavelength associated with its spectral width. For attosecond pulses this spot size is within the nanometer scale. Then we show that a two-level system can be left excited after interacting with an ultrashort pulse whose spectral width is larger than the transition frequency, and that the excitation probability depends not on the field amplitude but on the field intensity. The latter makes the excitation profile have the same spot size as the ultrashort pulse. This unusual phenomenon is caused by quantum electrodynamics in the ultrafast light-matter interaction regime since the usually neglected counterrotating terms describing the interaction with the free electromagnetic modes are crucial for making the excitation probability nonzero and depend on the field intensity. These results suggest that a train of coherent attosecond pulses could be used to excite fluorescent markers with nanoscale resolution. The detection of the light emitted after fluorescence—or any other method used to detect the excitation—could then lead to a new scheme for far-field light nanoscopy.

  • Figure
  • Received 11 March 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.103602

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Patrick Maurer1,2, J. Ignacio Cirac3, and Oriol Romero-Isart1,2,*

  • 1Institute for Quantum Optics and Quantum Information of the Austrian Academy of Sciences, A-6020 Innsbruck, Austria
  • 2Institute for Theoretical Physics, University of Innsbruck, A-6020 Innsbruck, Austria
  • 3Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany

  • *oriol.romero-isart@uibk.ac.at

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Issue

Vol. 117, Iss. 10 — 2 September 2016

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