Dresden 2011 – scientific programme

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O: Fachverband Oberflächenphysik

O 28: Plasmonics and Nanooptics III

O 28.1: Talk

Tuesday, March 15, 2011, 11:15–11:30, WIL A317

Tip-enhanced Spectroscopic Mapping — •Dai Zhang, Xiao Wang, and Alfred J. Meixner — Inst. Phys. Theo. Chem.

When a sharp Au tip approaching very closely to the sample surface, the tip-sample system behaves as an optical antenna. It confines and enhances the excitation field to a small sub-diffraction volume in the gap between the tip-apex and the surface and retrieving emitted or scattered photons to the far field for detection.

In my talk, the influence of several parameters, such as the gap distance, the material properties of the tip and the substrate as well as the size of the tip, on the performance of the gap-mode near-field optical microscopy will be systematically discussed. Gap-mode near-field spectroscopic mapping technique has been recently developed in our lab. I will demonstrate the Raman and photoluminescence spectroscopic imaging of the chemical distribution in the polymer:fullerene organic solar cell blend film [1]. From the simultaneously recorded morphology and spectroscopic information, the interplay among the blend film morphology, the local donor and acceptor molecular distributions, and the photoluminescence quenching efficiency will be discussed. With the above demonstrations, we propose that the gap-mode near-field optical microscopy is a promising, high-resolution and multi-function characterization technique for material science [1,2].

References [1] X. Wang et al, Advanced Functional Materials 20, 492 (2010). [2] D. Zhang et al, Physical Revew Letters, 104, 056601 (2010).