Importance

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Abstract

Provided is an optical element that can generate and extinguish a diffraction grating and can change the grating pitch of the appearing diffraction grating. The optical element includes a pair of opposing substrates, a plurality of electrodes arranged on one of the substrates, an electrochromic layer disposed so as to be in contact with the plurality of electrodes, and a counter electrode disposed so as to oppose the plurality of electrodes with the electrochromic layer therebetween. The optical element further includes insulating layers each disposed between the substrate and one of two adjacent electrodes in the plurality of electrodes and each having a thickness larger than that of the other electrode of the two adjacent electrodes.

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First Claim