Lithographic metal nanostructures for tip-enhanced spectroscopic methods

Damien Eschimese (1, 2) , Thomas Lerond (1) , S. Arscott (1, 3) , Gaëtan Lévêque (1, 2) , Thierry Melin (1, 2)

1 IEMN - Institut d’Électronique, de Microélectronique et de Nanotechnologie - UMR 8520
2 PHYSIQUE - IEMN - Physique - IEMN
3 NAM6 - IEMN - Nano and Microsystems - IEMN

The plasmonic properties of metallic nanodiscs and nanocones have been characterized with a view to applying them to high performance tip enhanced spectroscopic methods. The characterization used a setup based on the coupling of an achromatic inverted microscope equipped with a total internal reflection objective and an atomic force microscopy (AFM). Tunable plasmonic resonances are identified and are in excellent agreement with numerical simulations. The simulated and measured plasmonic response of the nanostructures suggest possible applications in a new generation of probes for tip-enhanced optical spectroscopy in which plasmonic nanostructures are designed at the apex of a non-metallic AFM tip. The tips enable a spectral tunability as a function of the specific material, the size, shape and topography, together with high electric field enhancement factors. The result in term of tip performances are better than those commonly used in tip-enhanced optical spectroscopy experiments such as tip-enhanced Raman spectroscopy (TERS).

Domaines: Sciences de l'ingénieur [physics]; Micro et nanotechnologies/Microélectronique

Damien Eschimese, Thomas Lerond, S. Arscott, Gaëtan Lévêque, Thierry Melin. Lithographic metal nanostructures for tip-enhanced spectroscopic methods. 8th Huitième conférence plénière biennale du GDR ONDES -CentraleSupélec, Oct 2019, Gif-sur-Yvette, France. ⟨hal-03094847⟩