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O: Fachverband Oberflächenphysik

O 24: Poster Session II: Plasmonics and nanooptics II

O 24.1: Poster

Monday, March 1, 2021, 13:30–15:30, P

Direct observation of Surface Plasmon Polaritons on permalloy nanostructures with femtosecond photoemission electron microscopy — •Maximilian Paleschke and Wolf Widdra — Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany

Due to remarkable progress in nanofabrication on the one hand and magneto optical methods on the other, the vivid field of magnetoplasmonics has become more and more accessible by a variety of excitation and investigation techniques.

Although it is well established that surface plasmon polaritons (SPP) can be imaged by photoemission electron microscopy (PEEM) in silver nanostructures[1], similar observations have not been reported for ordinary ferromagnetic materials like iron or nickel. Here, we report on dichroism images in threshold photoemission facilitating a tuneable femtosecond laser setup. The dichroism images show clear edge-induced standing waves with sub-micrometer wavelength. Analyzing the observed beating pattern as well as the coupling of the photon’s spin-angular momentum to the direction of the fringe fields hint to propagation characteristics exclusive to evanescent waves, such as SPPs.[2, 3] This implies the possibility that many materials with a high plasma frequency allow for excitation and experimental observation of SPPs via this method.

[1] M. Dabrowski et al., Chem. Rev. 120, 6247 (2020)

[2] A. Y. Bekshaev et al., Nature Com. 5, 8 (2014)

[3] Y. Dai et al., ACS Photonics 6, 2005 (2019)