Page 671 - Introduction to Information Optics

1L4. Information Display Using Electro-Optic Spatial Light Modulators 655

matrix,

/cos aAz — sin aAz
\sinaAz cos aAz

to be considered a unit matrix. Therefore, the overall Jones matrix is approxi-
mately given by

Az
exp -
T a A/ rot (aNAz) exp(-jIV</>Az) . (11.48)
exp

In the limit as N ->• oo, Az -*• 0, and JVAz = d,

(11.49)

This Jones matrix represents a wave retarder of retardation (3d, followed by a
polarization rotation of angle ad. Thus, the polarization state of an incident

AC voltage source

Transparent conductive
Alignment counter electrodes
direction Liquid crystal molecule

Incident light

Polarization axis
Alignment layers
Polarizer
Glass plates
Fig. 11.31(a). Operation of the twisted nematic liquid crystal cell in the absence of an electric field.