Hamburg 2001 – wissenschaftliches Programm

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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 25.38: Poster

Mittwoch, 28. März 2001, 15:00–18:00, Foyer zu B

Electrical Near-Field Enhancements with Triangular-shaped Gold Nanoparticles — •Manuel Goncalves¹, Matthias Wellhöfer², Olaf Hollricher², and Othmar Marti¹ — ¹Abteilung Experimentelle Physik, Universität Ulm, 89069 Ulm, Germany — ²WITec Wissenschaftliche Instrumente und Technologie GmbH, Hörvelsinger Weg 6, 89081 Ulm, Germany

Near-field optical enhancements around gold nanoparticles have been studied, using a SNOM microscope. These enhancements have been predicted theoretically [1][2] and are strongly related to the plasmon resonance frequencies and depend on shape of particles.

These enhancements happen usually near the corners and can reach several times the intensity of incident wave. However they have been very dificult to measure.

Triangular-shaped gold nanoparticles, with different sizes have been produced based on the method developed by U. Ch. Fischer [3], using latex nanospheres as masks for gold evaporation. After the removal of those spheres, triangular-shaped nanoparticles have been obtained. Their dimensional characterization has been been made by AFM and SEM microscopy, in order to compare with near-field optical images.

[1] J. P. Kottmann, O. J. F. Martin, D. R. Smith, and S. Schultz, New Journal of Physics, 2 (2000) 27.1–29.9 .

[2] O. J. F. Martin, and Ch. Girard, Appl. Phys. Lett., 70(6), pp. 705–707, Feb 1997.