Hier finden Sie wissenschaftliche Publikationen aus den Fraunhofer-Instituten.

Ellipsometry and Michelson interferometry for fixed- and variable-frequency electro-optical measurements on poled polymers



Journal of the European Optical Society. Part A, Pure and applied optics 5 (1996), Nr.5, S.561-567
ISSN: 0963-9659
Fraunhofer HHI ()
birefringence; dielectric polarisation; ellipsometry; light interferometry; molecular orientation; optical microscopy; optical polymers; photorefractive effect; pockels effect; thermal stability; michelson interferometry; variable-frequency electro-optical measurements; fixed-frequency electro-optical measurements; poled polymers; linear electro-optical effects; spatial distribution; temporal stability; dipole orientation; interferometric techniques; ellipsometric techniques; electro-optical measurements; relaxation spectroscopy; frequency scanning; linear susceptibility; optical birefringence; orientational enhancement; photorefractive polymers; scanning electro-optical microscopy; electro-optical phase-shift interferometry; spatial dipole-orientation patterns

Since the linear electro-optical or Pockels effect is one of the strongest and most useful effects in poled polymers, it can be employed for investigating the magnitude, the spatial distribution and the thermal and temporal stability of the dipole orientation. Some of the relevant ellipsometric and interferometric techniques are briefly described. Emphasis is given to frequency-dependent electro-optical measurements which permit a relaxation spectroscopy based on the probing of the dipole orientation by means of frequency scanning of the linear susceptibility (optical birefringence). Such a spectroscopy is of particular relevance for the recently introduced "orientational enhancement" in photorefractive polymers. In addition, scanning electro-optical microscopy and electro-optical phase-shift interferometry are described as useful methods for measuring spatial dipole-orientation patterns.