Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 10: Atomic systems in external fields
A 10.4: Talk
Monday, March 17, 2014, 15:00–15:15, BEBEL E44/46
Imaging sub-wavelength optical near-fields of isolated nanosystems — •Lennart Seiffert1, Frederik Süßmann2, Sergey Zherebtsov2, Matthias Kling2, and Thomas Fennel1 — 1Universität Rostock, 18051 Rostock, Germany — 2Max-Planck-Institut für Quantenoptik, 85748 Garching, Germany
A comprehensive understanding of optical near-field dynamics is key to realizing ultrafast light-wave control of electron motion on the nanoscale.
Imaging the near-fields of isolated nanosystems offers fundamental insights into the sub-wavelength spatiotemporal field evolution but requires new, non-invasive metrology.
Here we investigate for silica nanospheres to which extend phase-controlled electron backscattering [1] can be used as a probe for localized fields and their particle size-dependent propagation.
The electron dynamics is modelled using a quasi-classical trajectory-based mean-field Monte-Carlo approach [2], which is extended to account for propagation effects of the near-fields.
We show that characteristic spatial information on the resulting local enhancement of the near-field can be extracted from the angular-resolved
photoemission recorded as function of the carrier-envelope-phase of the driving few-cycle laser field [3].
In particular, we study the emergence of sub-wavelength nanofocusing via the size-dependent deformation of the near-field distribution.
[1] S. Zherebtsov et al., Nature Phys. 7:656 (2011)
[2] S. Zherebtsov et al., New J. Phys. 14:075010 (2012)
[3] F. Süßmann et al., submitted (2013)