Electrically controlled birefringence mode

As a consequence of the voltage-controlled destructive interference, the applied electrical signal is transduced onto the optical beam as an amplitude modulation. The birefringent modulator depicted in Eig. 3.11b functions as an electri-cal-to-optical signal transducer. Here, both TM and TE optical modes traverse... 

To exploit the electric field-induced birefringence in display applications, the polarization of the incident light through the optical retardation produced by the induced birefringence is simply controlled in a manner similar to the mode of retardation control used for in-plane switching (IPS). If a simple comb-shaped IPS electrode is used for the device, the optical axis of the induced birefringence is parallel to the electric field, and the optical axes lie mainly in a plane perpendicular to the comb [21, 22]. A typical voltage-transmittance curve is shown in Fig. 8.18. 

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