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SYBP: Biophotonik

SYBP 4: Postersitzung

SYBP 4.17: Poster

Donnerstag, 7. März 2002, 17:45–20:00, Schloss

On single molecule detection with a SNOM by scanning probe enhanced elastic resonant scattering (SPEERS) — •U.C. Fischer¹, J. Heimel¹, E. Bortchagovsky², and H. Fuchs¹ — ¹Physikalisches Institut, Universitaet Muenster — ²Institute of Semiconductor physics, Kiev, Ukraine

Images of small domains in a monolayer of J-aggregated dye molecules were obtained with a SNOM (Scanning Near Field Optical Microscope) with the tetrahedral tip as a light emitting probe and an auxiliary STM mode for distance control [1,2]. 20 nm domains could be imaged with a high contrast especially well in a depolarized imaging mode [3]. The contrast is tentatively explained by a scanning probe enhanced elastic resonant scattering process (SPEERS)[4]. This mechanism is closely related to a recently discovered phenomenon, that the transmission of a planar gold film can be increased [5] and its absorption can be decreased by the adsorption of a light absorbing layer of dye molecules.

This work was supported by the Volkswagen foundation

[1] J. Koglin, U.C. Fischer, H. Fuchs. Phys. Rev. B 55 (12), 7977-7984 (1997); [2] J. Heimel, U.C. Fischer, H. Fuchs. J. Microscopy 202, 53-59 (2001); [3] J. Heimel et al. to be published; [4] U. C, Fischer, J. Heimel. Jpn. J. Appl. Phys. 40, 4391-4394 (2001); [5] U. C. Fischer, E. Bortchagovsky, J. Heimel. Submitted for publication