Dresden 2009 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 27: Poster Session I (Methods: Scanning probe techniques; Methods: Atomic and electronic structure; Methods: Molecular simulations and statistical mechanics; Oxides and Insulators: Clean surfaces; Oxides and Insulators: Adsorption; Oxides and Insulators: Epitaxy and growth; Semiconductor substrates: Clean surfaces; Semiconductor substrates: Epitaxy and growth; Semiconductor substrates: Adsorption; Nano- optics of metallic and semiconducting nanostructures; Electronic structure; Methods: Electronic structure theory; Methods: other (experimental); Methods: other (theory); Solutions on surfaces; Epitaxial Graphene; Surface oder interface magnetism; Phase transitions; Time-resolved spectroscopies)

O 27.77: Poster

Dienstag, 24. März 2009, 18:30–21:00, P2

Metamaterial Biosensors — •Martin Mesch, Zhaolu Diao, Na Liu, and Harald Giessen — 4th Physics Institute, University of Stuttgart, Germany

In our work we use the tailored optical properties of metallic metamaterial structures to measure the concentration of biologically relevant molecules in solution.

In metamaterials, the structures consist of a basic element, the well-known split ring resonator (SRR), periodically repeated in two dimensions. Combining two of those SRRs in a symmetry-breaking fashion results in a coupled system which displays a sharp resonance in transmission and reflection of incident light. The structure is very sensitive to its vicinity, and therefore a sensor can be built by observing the shift of the resonance position. To distinguish between different molecules, a sensitive biological element (e.g., antibodies, enzymes, cell receptors) is attached to the structure, which responds positively to the molecules that are supposed to be detected.

Several experimental examples will be demonstrated, and the limits to sensitivity will be discussed.