Dresden 2009 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 38: Nano-optics of metallic and semiconducting nanostructures (experiments I)
O 38.4: Vortrag
Mittwoch, 25. März 2009, 15:45–16:00, SCH A216
A Simple Fabrication of Nanoantennae over Large Areas — •Reto Giannini1, Arda Kristopuryan1, Yasin Ekinci1, Pratap K. Sahoo2, and Jörg F. Löffler1 — 1Laboratory of Metal Physics and Technology, Department of Materials, ETH Zurich, 8093 Zurich, Switzerland — 2Laboratory of Micro- and Nanotechnology, Paul Scherrer Institute, 5232 Villigen, Switzerland
Metallic nanoparticles are very promising candidates for the creation of nanoantennae. Such nanoantennae can be used to excite flourophores more efficiently or to increase the emission of molecules and quantum dots leading to applications in biosensing, nanophotonics and Raman-/fluorescence spectroscopy. The basis of using metallic nanoparticles as nanoantennae is their capability to create a huge electromagnetic enhancement. This enhancement is a consequence of the resonant excitation of charge density oscillations, known as surface plasmons. A further significant increase of the enhancement can be achieved by coupling of two closely-spaced nanoparticles (dimers). Reproducible and cost-effective methods, applicable to large areas, are readily available for single nanoparticles, whereas well-defined dimers are difficult to obtain with comparable simple methods. We have fabricated gold and silver nanoantennae using colloidal lithography and thermal evaporation providing nanoparticle dimers with small gaps over large areas. We measured the plasmon resonances of individual gold and silver dimers with different structural parameters and performed surface-enhanced Raman spectroscopy to determine the relative near-field enhancement factors of the fabricated nanoantennae.