| 摘要 |
A structure includes a substrate (32,31) and a light modulating film(46) formed on top of the substrate (32,31). The light modulating film(46) is made of polycrystalline PLZT containing Pb, Zr, Ti, and La as constituent elements. The film has a La concentration in the range of 5 at% to 30 at%. The relative dielectric constant at a frequency of 1 MHz is higher than or equal to 1200.
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