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Regensburg 2016 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster: Functional Polymer Hybrids

CPP 15.6: Poster

Monday, March 7, 2016, 18:15–21:00, Poster B2

Mechanically tunable plasmon ruler by exploiting macroscopic colloidal line grating — •Anja Maria Steiner1, Christoph Hanske2, Tobias A.F. König1, and Andreas Fery11Institute of Physical Chemistry and Polymer Physics, Leibniz Institute of Polymer Research (IPF), Hohe Str. 6, 01069 Dresden — 2Dept. of Physical Chemistry 2, University of Bayreuth, Universitätsstr. 30, 95440 Bayreuth

Large-scale, template-assisted assemblies of plasmonic gold nanospheres1 transferred to low-modulus, high-elongation elastomeric substrates (PDMS) represent a novel class of tunable optical systems. We present a tunable optical system with the ability to reversibly shift the plasmonic key resonance by mechanical deformation. This strain-dependent plasmonic response is observed with conventional UV/vis/NIR spectroscopy and is correlated to in-situ scanning probe microscoy measurements.

In strong agreement with finite-difference time-domain (FDTD) simulations the tunable optical response can be distinguished into two effects: First, the plasmonic resonance shift depending on the interparticle distance within the lines (plasmon ruler). Second, the line-to-line coupling, which becomes dominant at a certain distance (grating effects).

Overall, controlling the optical response upon mechanical deformation gives the opportunity for mechano-optically active systems and soft optical sensors.

[1] Christoph Hanske et al., Nano Lett., 2014, 14, 6863-6871

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