Ngk Insulators, Inc.

Jungo Kondou

Keiichiro Asai

Shoichiro Yamaguchi

Kousuke Niwa

An optical element includes an optical waveguide layer. The optical waveguide includes a periodic structure of grooves. The optical waveguide layer has a layer-thickness equal to or greater than 1.5 &#x3bc;m and is made of material selected from a group consisting of Ta2O5, Al2O3, LiNbO3, LiTaO3, AlN, GaN, SiC, and Yttrium aluminum garnet (YAG). (D/0.5&#x39b;)&#x2265;2.5 is satisfied where D indicates the depth of groove; and &#x39b; indicates the pitch of the arranged grooves in the periodic structure. The unit of &#x39b; is identical to the unit of D.

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Nagoya, Japan

Jungo Kondou