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Imaging of liquid crystals using a new scanning near-field optical microscope with microfabricated tips and shear force detection

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5 Author(s)
Roder, Th. ; Physical Chemistry, University of Paderborn, Warburger Str. 100, 33098 Paderborn, Germany ; Paelke, L. ; Held, N. ; Vinzelberg, S.
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We report results obtained with a scanning near-field optical microscope which was developed, recently. The scanning head of the device is mounted on an inverted polarizing microscope. The sample is illuminated through a microfabricated tip which is mounted on a single-mode optical wave-guiding fiber. The light transmitted through the sample is collected in the far field by a microscope lens. The distance between the tip and the sample is controlled by shear force detection, using a nonconventional setup. We applied this new equipment successfully in order to investigate birefringent and dichroic liquid crystal films, using polarization modulation or fluorescence detection, respectively. An optical resolution down to ≈200 nm was obtained on the sample of a cholesteric liquid crystal for a wavelength of 488 nm. © 2000 American Institute of Physics.

Published in:

Review of Scientific Instruments  (Volume:71 ,  Issue: 7 )

Date of Publication:

Jul 2000

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