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We measured spectral refiectance and absorptance ofphotonic crystals prepared by selfLassembling of silica micro − spheres ． The measured spectral absorptance was enhanced at the edge ofthe photonic f ヒ equcncy gap ．We calculated the spectral hemispherical absorptance Qf a three−dirnensional photonic crystal with defects by using the rigorQus coupled wave analysis ( RCWA ) ． Ihe calculated periodic stucture was made by using a SEM image of photonic crystals ， The calculated spectral hemispherical absorptance is enhanced in the near −infrared ． The enhancement of absorptance cannot be explained by the analytical model fbr a photQnic crystaL The abso 叮 ｝ tance ofaphotonic crystal can be enhanced by the defects o 負 he per 正 odic structure ．

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