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 27.10: Poster
Dienstag, 24. März 2009, 18:30–21:00, P2
s-SNOM from IR to the THz with tuned scatterers — •Hans-Georg von Ribbeck1,2, Marc Tobias Wenzel1, and Lukas Matthias Eng1 — 1Institute of applied photo physics, TU Dresden, Germany — 2Forschungszentrum Dresden-Rossendorf, Dresden, Germany
Here we present a scattering near-field optical microscope (s-SNOM) set-up established at the free-electron laser source (FEL) at the Forschungszentrum Dresden-Rossendorf. This microscope is capable to perform optical observations at nanometer scale resolution over the full wavelength range of the FEL, i.e. 3 to 250 micron (1.2 to 100 THz). Furthermore, the optical resolution governed by the near-field interaction between tip and sample and the signal-to-noise ratio is enhanced by specially designed, optically resonant probes. This ultimately results in a much better spatial confinement achieving a resolution preferably of lambda/1000 for the THz region. Also, coupling both a resonant tip and sample will lead to giant polaritonic resonances. Finally the described setup will grant access to new areas of nanoscale applications, such as observing the optical behavior of strained and mixed silicon structures, high-Tc superconductors, single quantum dots, and superlattices at THz frequencies.
Basis to our approach is the recent work [1] where an optical confinement of the near field in z-direction was achieved through tuned scatterers in the form of metallic nanoparticles (MNPs) attached to the AFM tip, serving as non-resonant antennas. Tunability in the THz range will be achieved through geometrically tuned metal wires [2].