A high diffraction efficiency electro-optic phase grating is fabricated by depositing transparent interdigital electrodes on a lanthanum-modified lead zirconate titanate ceramic wafer. The diffraction efficiency is controlled by an applied d.c. voltage. The zero-order light is completely shut off when the first-order diffraction reaches its maximum, with a voltage of 140 V. The device can be used as a voltage-controlled switch in optical interconnects.
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Song et al. (1994) studied this question.
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