Dresden 2020 – wissenschaftliches Programm
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CPP 97.6: Vortrag
Donnerstag, 19. März 2020, 16:30–16:45, ZEU 255
Surface Lattice Resonances in the Visible Optical Range by Soft Lithography Templates and Directed Self-Assembly. — •Vaibhav Gupta1, Andreas Fery1,2, and Tobias a.f. König1,2 — 1Leibniz-Institut für Polymerforschung Dresden e. V., Hohe Straße 6, D-01069 Dresden, Germany — 2Physical Chemistry, Technical University of Dresden, 01062 Dresden, Germany
We demonstrate a novel approach towards mechanically tunable, cost-efficient and low-loss plasmonic nanostructures, whose pronounced optical anisotropy upon mechanical deformation can be detected by naked eye.1 Soft interference lithography and template-assisted colloidal self-assembly are used to fabricate a stretchable macroscopic periodic square lattice of gold nanoparticles. Surface scanning methods reveal a full coverage of the array. The high structural quality results in a narrow bandwidth surface lattice resonance with a line width of 25. Stretching of the system results in reversible transition from the square lattice to a rectangular symmetry and corresponds to pronounced changes in the optical properties of the ensemble. We show the hybrid nature of the optical response using angle dependent UV-vis spectroscopy and numerical simulations. Based on these findings and our colloidal metasurface concept.2 We discuss potential applications as strain sensor and mechanically tunable filters.