Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.51: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Transfer of Angular Momentum by Circularly Polarized Near Fields — •Peter Klaer, Florian Schertz, Keno Krewer, Gerhard Schönhense, and Hans-Joachim Elmers — Institut für Physik, Johannes Gutenberg-Universität Mainz, 55122 Mainz

A locally rotating electrical near field generated by special nanoantennas might have properties similar to a circularly polarized plane light wave.[1] In particular, the photons of the near field possess spin momenta of ± ℏ and all effects related to the photon spin should exist for near fields as well. The plasmonic near field concentrates large amounts of electromagnetic energy and, for rotating fields, also large amounts of photon spin momentum in a very small spatial volume far below the diffraction limit.

We show first results confirming the transfer of angular momentum by circularly polarized near fields using spin-polarized photoemission electron microscopy (SP-PEEM) to detect the spin polarization of electrons excited by 100fs light pulses with 800nm wavelength from localized plasmons on a Ag/GaAs(100) surface. We thank the DFG EL172/16-1 for financial support.

[1] R. Mohammadi et al., Appl. Phys. B, publ. online (2011).