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BP: Fachverband Biologische Physik

BP 12: Poster II

BP 12.6: Poster

Dienstag, 2. April 2019, 14:00–16:00, Poster B2

Tunable nanoplasmonic substrates for biosensory applications — •Peter Kolb and Kay-E. Gottschalk — Institute for Experimental Physics, Ulm University, Germany

Arrays of metallic nanoparticles show specific electromagnetic resonances which are strongly dependent on their geometry. Coupling between closely spaced plasmonic particles leads to a strong resonance dependence on the inter-particle distance. By combining gold nanoparticles with a soft PDMS substrate, resonances can be mechanically tuned [1] or used to detect substrate strain [2]. As gold and PDMS are both biocompatible they are frequently used in biological applications.

Utilizing electron beam lithography, electron beam evaporation, and lift-off procedures, we produce gold nanodisc arrays on soft PDMS substrates. We investigate the optical properties of these substrates by simulation and experimentation, with further testing of suitability for biosensing applications.

References:

[1] Liu, Wenjie, et al., Mechanically tunable sub-10 nm metal gap by stretching PDMS substrate. Nanotechnology 28.7 (2017): 075301.

[2] Gao, Li, et al., Optics and nonlinear buckling mechanics in large-area, highly stretchable arrays of plasmonic nanostructures. ACS nano 9.6 (2015): 5968-5975.