光と物質の相互作用を操作するフォトニック結晶機能と有機材料の優れた非線形光学機能とを融合させた有機フォトニック結晶の創製及びそのデバイス応用について述べる．スローライトなどの特異な光分散関係を利用することによって、光スイッチや波長変換、2光子励起蛍光素子などの非線形光学デバイスの大幅な性能向上を達成している．また有機電気光学（EO）ポリマーとシリコンフォトニック結晶を融合した集積型EO変調器の研究開発についても報告する。

We report the fabrication and device applications of the nonlinear photonic crystals (PhCs) which combines PhC functions for controlling the light dispersion characteristics and highly nonlinear optical organic materials. We reveal a direct relationship between the observed nonlinear optical responses and the corresponding photonic band dispersion nature such as a slow light in the nonlinear PhCs,, and we show experimental evidence that the performance of nonlinear optical applications such as the optical switch,, wavelength conversion and two-photon absorption devices are dramatically improved in this structure. Moreover,, we report on the design and experimental demonstration of an integrated Mach-Zehnder electro-optic (EO) modulator based on the silicon PhC waveguides combined with an EO polymer exhibiting large electro-optic properties.