Berlin 2018 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 77: Poster: Plasmonics and Nanooptics

O 77.1: Poster

Mittwoch, 14. März 2018, 18:15–20:30, Poster A

Spectroscopic investigation of periodic plasmonic superstructures — •Ekaterina Ponomareva and Matthias Karg — Heinrich-Heine-University Düsseldorf, Physical Chemistry I, Düsseldorf, Germany

Nanoparticles with a plasmonic metal core and a soft cross-linked hydrogel shell spontaneously self-assemble at an air/liquid interface forming periodic monolayers [1]. These layers can be transferred on glass substrates yielding substrate-supported superstructures with hexagonally arranged plasmonic nanoparticles at inter-particle distances of a few hundred nm. Due to the spatial proximity and the periodicity of the array, localized surface plasmons of metal cores can couple to diffractive modes and thus support surface lattice plasmon resonances [2]. By embedding the monolayer into a gain-medium these resonances can be enhanced.

Here we will demonstrate the angular-dependent optical behavior of periodic plasmonic monolayers. UV-vis measurements show different optical properties for dilute particles in aqueous dispersion, the assembled monolayers and the monolayers upon embedding in a gain matrix. A home-made lasing-spectrometer was used to investigate the collective optical response of the plasmonic lattices in dependence on the detection and incident angle. With the set-up it is possible to observe the near-field and radiative plasmonic coupling effects in colloidal monolayers.

[1] K. Volk et al., Adv. Mater. 24 (2015), 7332

[2] K. Volk et al., Adv. Optical Mater. 5 (2017), 1600971