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Cross-sectional view of the reflective LCPG (a) under no external field and, (b) when a voltage much larger than the threshold voltage is applied. (c) Geometry and diffraction notation for incident monochromatic light.
(a) Diffraction efficiencies and Reflectance for the ±1 and 0 orders. (b) Electrical switching times. (c) First-order contrast-ratio measured at different voltages. Incident angle was fixed at 5° and probe was a He–Ne laser at 633 nm.
Diffraction efficiencies of the (a) and (b) −1 reflected orders for different input polarization, as set by the rotation of a QWP (circles) and HWP (squares) respectively. Angle of incidence was fixed at 5°. (c) Comparison of measured (markers) and simulated (lines) diffraction efficiencies of reflective LCPGs at various incident angles for linearly polarized light input. A He–Ne laser was used for all the measurements.
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