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Proceedings Paper

Toward the development of a three-dimensional mid-field microscope
Author(s): Yuval Garini; Vladimir G. Kutchoukov; Andre Bossche; Paul F. A. Alkemade; Margreet W. Docter; Piet W. Verbeek; Lucas J. van Vliet; Ian T. Young
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Paper Abstract

Recently, an extraordinary transmission of light through small holes (<200 nm) in a thin metallic film has been described. This phenomenon has been shown to be the result of the photon-plasmon interaction in thin films where a periodic structure (such as a set of holes) is embedded in the film. One of the extraordinary results is that the beam that passes through a hole has a very small diffraction in extreme contrast to the wide angle predicted by diffraction theory. Based on this effect, we propose here a new type of microscopy that we term mid-field microscopy. It combines an illumination of the sample through a metallic hole-array with far-field collection optics, a scanning mechanism and a CCD. When compared to other high resolution methods, what we suggest here is relatively simple because it is based on a thin metallic film with an array of nano-sized holes. Such a method can be widely used in high-resolution microscopy and provide a novel simple-to-use tool in many life-sciences laboratories. When compared to near-field scanning optical microscopy (NSOM), the suggested mid-field method provides a significant improvement. This is chiefly for three reasons: 1. The penetration depth of the microscope increases from a few nanometers to a few micrometers, hence the name mid-field microscope. 2. It allows one to measure an image faster because the image is measured through many holes in parallel rather then through a single fiber tip used in conventional near-field microscopy, and 3. It enables one to perform three-dimensional reconstruction of images due to a semi-confocal effect. We describe the physical basics of the photon-plasmon interaction that allows the coupling of light to the surface plasmons and determines the main spectral characteristics of the device. This mechanism can be ascribed due to the super-periodicity of the electron oscillations on the metallic surface engendered by the grating-like structure of the hole-array.

Paper Details

Date Published: 16 June 2004
PDF: 8 pages
Proc. SPIE 5327, Plasmonics in Biology and Medicine, (16 June 2004); doi: 10.1117/12.537623
Show Author Affiliations
Yuval Garini, Delft University of Technology (Netherlands)
Vladimir G. Kutchoukov, Delft University of Technology (Netherlands)
Andre Bossche, Delft University of Technology (Netherlands)
Paul F. A. Alkemade, Delft University of Technology (Netherlands)
Margreet W. Docter, Delft University of Technology (Netherlands)
Piet W. Verbeek, Delft University of Technology (Netherlands)
Lucas J. van Vliet, Delft University of Technology (Netherlands)
Ian T. Young, Delft University of Technology (Netherlands)

Published in SPIE Proceedings Vol. 5327:
Plasmonics in Biology and Medicine
Tuan Vo-Dinh; Zygmunt Gryczynski; Joseph R. Lakowicz, Editor(s)

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