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Hamburg 2001 – scientific programme

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O: Oberflächenphysik

O 25: Postersitzung (Grenzfl
äche fest-flüssig, Methodisches, Nanostrukturen, Organische Dünnschichten, Rastersondentechniken, reine Oberfl
ächen, Teilchen und Cluster, Zeitaufgelöste Spektroskopie, Sonstiges)

O 25.12: Poster

Wednesday, March 28, 2001, 15:00–18:00, Foyer zu B

Imaging of 2-dimensional Nanostructures by SNOM — •H.-J. Maas1, A. Naber1, U.C. Fischer1, H. Fuchs1, J.-C. Weeber2, and A. Dereux21Physikalisches Institut, WWU Münster, Germany — 2Laboratoire de Physique, Optique Submicronique, Université de Bourgogne, Dijon, France

Investigations of structures with a nanoscopic size is a task for Scanning Near Field Optical Micoscopy (SNOM) with an optical resolution limited by the size of the illuminating light source and its distance to the sample. Imaging nanostructures by SNOM means probing the photonic structure which has to be regarded as the local density of electromagnetic states of the sample for a given wavelength [1].

This context is discussed for a gold projection pattern as a sample which is probed with the tetrahedral tip (T-Tip) in a combined SNOM/SFM mode [2,3]. The influence of the probing tip and the sample can be distinguished by comparing the experimental SNOM images with numerical calculations of such gold structures [4]. A light emitting dipole being parallel to one of the edges of the T-Tip is used as a model for the nanoscopic light source. This work was supported by the German ministry of Education and Research (Grant No. 13N7641)

[1] A. Dereux, C. Girard, and J.-C. Weeber, J. Chem. Phys. 112, 775 (2000)

[2] J. Koglin, U.C. Fischer, and H. Fuchs, Phys. Rev. B 55, 7977 (1997)

[3] A. Naber, H.-J. Maas, K. Razavi, and H. Fuchs, Rev. Sci. Instr. 70, 3955 (1999)

[4] H.-J. Maas et al., submitted for publication

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