Abstract
The electric field-induced orientation of nematic 4- n-pentyl-4′-cyanobiphenyl (5CB) molecules in the boundary layer at a germanium electrode surface was investigated by means of modulation infrared attenuated total reflection (ATR) spectroscopy. The dielectric response of the 5CB molecules to an externally applied d.c. electric field was evaluated from polarization modulation measurements of the CN stretching vibration. The field strength and angle of incidence dependence of the polarization-modulated signal clearly show that the responsivity becomes depressed as the molecule approaches the electrode surface. Electric field modulation measurements were also made in square-wave electric fields to explore the dynamic response of the molecules to alterations in the field strength.
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