Ultrafast nanooptics

Transfer of angular momentum by circularly polarized near fields (Elmers, Kreiter)

The aim of the experiment is to measure the efficiency of angular momentum transfer from the electromagnetic near field to the spin system of a probe particle or film. The experimental set-up comprises a combination of photoemission electron microscopy (PEEM) and an electron spin-analyzer (Mott-type) allowing the measurement of individual coupled nanostructures. Using circularly polarized light from a femtosecond laser (Titanium-sapphire), localized plasmons with circular polarization are excited. The key advantage of near field optics lies in the large electro-magnetic field strength that can be achieved without destruction of the sample, giving access to otherwise impossible experimental conditions. In addition, time-resolved measurements using pump-probe techniques provide information on the time-dependence of the angular momentum transfer process.


Dominance of the first excitation step for magnetic circular dichroism in near-threshold two-photon photoemission
K. Hild, G. Schönhense, H.J. Elmers, T. Nakagawa, T. Yokoyama, K. Tarafder, P.M. Oppeneer
Phys. Rev. B 85 (2012) 014426
Near field of strongly coupled plasmons: Uncovering dark modes
F. Schertz, M. Schmelzeisen, R. Mohammadi, M. Kreiter, H.J. Elmers, and G. Schönhense
Nano Letters (2012)
Plasmon Hybridization in Stacked Double Crescents Arrays Fabricated by Colloidal Lithography
N. Vogel, J. Fischer, R. Mohammadi, M. Retsch, H.J. Butt, K. Landfester, C.K. Weiss, and M. Kreiter
Nano Letters 11 (2011) 446
Manipulating near field polarization beyond the diffraction limit
R. Mohammadi, A. Unger, H.J. Elmers, G. Schönhense, M.Z. Shushtari, M. Kreiter
Appl. Phys. B 104 (2011) 65
Fluorescence enhancement from individual plasmonic gap resonances
M. Schmelzeisen, Y. Zhao, M. Klapper, K. Müllen and M. Kreiter
ACS Nano 4 (2010) 3309
Magnetic Circular Dichroism in Two-Photon Photoemission
K. Hild, J. Maul, G. Schönhense, M. Amft, and P.M. Oppeneer
Phys. Rev. Lett. 102 (2009) 057207
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