Active U-turn electrooptic switch formed in patterned holographic polymer-dispersed liquid crystals |
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Authors: | Jun Qi Haiqing Xianyu Jianhua Liang GP Crawford |
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Affiliation: | Dept. of Phys., Brown Univ., Providence, RI, USA; |
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Abstract: | We have developed an active U-turn device by spatially patterning two identical holographic polymer dispersed liquid-crystal gratings. In the field-OFF state, the holographic planes of both gratings are slanted such that the angle of the diffraction beam is beyond the total internal reflection angle of the air-glass interface. The diffraction beam is "trapped" in the device until diffracted by the second slanted grating. In the field-ON state, the holographic grating is "erased" and the incident beam propagates directly through the sample. The index modulation is determined to be 0.059 /spl plusmn/ 0.006 at 1.55 /spl mu/m. Low switching voltage and sub-millisecond response times are reported. |
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