| 摘要 |
The present invention is directed to the provision of a liquid crystal optical element that is inexpensive, has an ideal refractive index profile, and functions as a high-performance gradient-index lens. The liquid crystal optical element ( 100 ) includes a first planar substrate ( 101 ), a second planar substrate ( 105 ), a liquid crystal ( 106 ) provided between the first and second planar substrates, an electrode pattern ( 200 ) formed on one of the first and second planar substrates and having a plurality of regions ( 201 to 215 ) each for varying an effective refractive index for a light beam by a respectively different degree, and a counter electrode ( 108 ), formed on the other one of the first and second planar substrates, for applying voltage with respect to the electrode pattern, wherein the refractive index for a light beam varies with the square of the distance from the center of the liquid crystal optical element along a radial direction across the liquid crystal optical element when the voltage is applied between the electrode pattern and the counter electrode.
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