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Applied Physics Letters / Volume 93 / Issue 11 / LASERS, OPTICS, AND OPTOELECTRONICS

Appl. Phys. Lett. 93, 111114 (2008); http://dx.doi.org/10.1063/1.2987485 (3 pages)

Three-dimensional optical antennas: Nanocones in an apertureless scanning near-field microscope

M. Fleischer1, C. Stanciu2, F. Stade1, J. Stadler2, K. Braun2, A. Heeren1, M. Häffner1, D. P. Kern1, and A. J. Meixner2

1Institute of Applied Physics, Eberhard Karls University Tübingen, Auf der Morgenstelle 10, 72076 Tübingen, Germany
2Institute of Physical and Theoretical Chemistry, Eberhard Karls University Tübingen, Auf der Morgenstelle 8, 72076 Tübingen, Germany

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(Received 23 May 2008; accepted 29 August 2008; published online 18 September 2008)

A sharp-tipped gold nanocone and the vertically aligned metallic tip of a near-field optical microscope together form a three-dimensional optical antenna with a highly controllable gap. Confocal measurements with different laser modes show the efficient axial excitation of the cones with a longitudinally polarized field. In the antenna configuration, extremely strong field enhancement up to a factor of 100 is obtained by tuning the gap between the two sharp tips down to few nanometers.

© 2008 American Institute of Physics

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KEYWORDS and PACS

Keywords

antennas, gold, nanostructured materials, optical microscopy

PACS

  • 84.40.Ba

    Antennas: theory, components and accessories

  • 07.79.Fc

    Near-field scanning optical microscopes

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2987485

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
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    J. A. Porto, P. Johansson, S. P. Apell, and T. Lopez-Rios, Phys. Rev. B 67, 085409 (2003).


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