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Proceedings Paper

Far-infrared near-field microscope
Author(s): Reimund Merz
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Paper Abstract

The resolving power of classical optical microscopy is restricted to about one half of the wavelength because of diffraction. In the far infrared this limits the resolution to a rather macroscopic scale of about 100 μm. On the other hand it is well known that a truely microscopic confinement of radiation much below the diffraction limit can be obtained by using a transmitting aperture smaller than the wavelength. In this case the illuminating field consists primarily of evanescent waves bound to the aperture. The object to be investigated is placed within this field at a small distance less than the diameter of the aperture. Examples of λ/20 resolution have been given both at visible and at microwave frequencies.1,2 Massey reported on a near field microscope with a resolution of λ/4 for the far infrared.3

Paper Details

Date Published: 1 October 1991
PDF: 2 pages
Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15765E (1 October 1991); doi: 10.1117/12.2297907
Show Author Affiliations
Reimund Merz, Max-Planck-Institut für Festkörperforschung (Germany)

Published in SPIE Proceedings Vol. 1576:
16th International Conference on Infrared and Millimeter Waves
Minh Quang Tran, Editor(s)

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