Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)

O 35.114: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster B

Scanning near-field optical microscopy with single color centers — •Thomas Oeckinghaus, Julia Tisler, Rainer Stöhr, Roman Kolesov, Rolf Reuter, Friedemann Reinhard, and Jörg Wrachtrup — Universität Stuttgart, 3. physikalisches Institut

We are using single color centers as a light source for apertureless scanning near-field optical microscopy. Specifically, we use a nanodiamond of a size below 10nm, containing only a single nitrogen-vacancy color center, which we attach to the tip of an AFM. Close to a sample, the fluorescence of the color center is modulated by fluorescence resonance energy transfer (FRET), a short ranged dipole-dipole interaction. This interaction quenches the fluorescence of the donor (color center), whenever it is approached to an acceptor (sample). Because of the short range of FRET, high resolution scanning images can be obtained in this way. We successfully acquired SNOM images of a graphene monolayer with a resolution of 20 nm.

Furthermore, we present a technical development, stroboscopic detection of an oscillating tapping-mode AFM tip. This allows to scan at a specific height above the sample or to reduce stress on the sample by avoiding contact mode scanning.