Dresden 2014 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.13: Poster
Dienstag, 1. April 2014, 18:30–22:00, P2
GRIN lenses with plasmonic structures as compact elements for biosensing — •Andreas Horrer1, Michael Metzger2, Sabrina Rau2, Dominik A. Gollmer1, Julia Fulmes1, Dai Zhang2, Alfred J. Meixner2, Günther Gauglitz2, Marc Brecht2, Dieter P. Kern1, and Monika Fleischer1 — 1Institute for Applied Physics, University of Tuebingen, Auf der Morgenstelle 10, 72076 Tuebingen, Germany — 2Institute of Physical and Theoretical Chemistry, University of Tuebingen, Auf der Morgenstelle 10, 72076 Tuebingen, Germany
Light scattering by metallic nanostructures shows resonances at certain wavelengths which are due to the plasmonic properties of the structures. These resonances show a characteristic wavelength shift when the medium and thereby the refractive index in the range of the near field of the structures is changed. This can be used for the detection of molecules with high sensitivity. Nanostructures can be fabricated in defined shapes and sizes by standard electron beam lithography. It is however difficult to use this method on small or non-planar surfaces. GRIN lenses are small glass cylinders with a diameter of only a few millimeters and a built-in radial gradient of the refractive index, which enables focusing of incident parallel light onto one of their plane surfaces. For structuring of GRIN lens surfaces we use a process in which gold nanostructures fabricated on silicon can be transferred directly onto the lenses. These structures are automatically in the focus when excited through the lens and therefore allow for compact sensing setups. The fabricated structures on GRIN lenses as well as their optical properties will be presented.