| 摘要 |
To provide a novel technique for producing a difference in refractive index between two regions. An optical element according to the present invention includes a first porous region ( 2002 ), a second porous region ( 2004 ), and a non-porous region ( 2003 ) formed between the first porous region ( 2002 ) and the second porous region ( 2004 ), the non-porous region having a refractive index higher than a refractive index of the first porous region.
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