Modern Polymer Spect..

42 2 Segnien frrl Mobility of Liquid Cyystrils crrzd Liqziirl-Cr~~stallii~e Polyrnel-s
GERMAHIUM WINDOU (ELECTRODE)
I \
A
a
I \
I N I
bIWFRARED BEAH
DIRECTION
'
,-
b
POLARIZED INFRARED BEAM
A
C
h
I NFRRRED' BERM
AND ELECTRIC FIELD DIRECTION
ED
Figure 2-7. Electric field-induced orientation
of a liquid crystal (a) Construction
of the meaauiement cell (b) Hornogeiieous
al~gninent of the LC between the
dnisotromc electrode surfaces before
application of the electric field.
(c) Hoineotropic alignment of the LC
during application of the electric field.
retardation is finished, the mirror is moved to the next retardation point (Figure
2-2b).
After a settling time of 40 ms, the experiment is repeated as described above. For
the presented experiments all data were collected symmetrically around the centerburst
of the interferogram. A total number of 2368 mirror positions were scanned,
leading to a spectral resolution of 8 c1n-l. After completing the data collection at
each retardation point, the data were resorted to interferograiiis on the time scale
(Figure 2-2b) and transformed to the corresponding spectra. According to this