The invention photonic crystal substrate and the optical element assembly is implemented using them to form an optical waveguide relates to, and more particularly, to a vertical-type photonic crystal optical device assembly comprising a substrate and a surface-emitting light source element and the light-receiving surface-type optical sensor elements to facilitate the integration. ; picture of the present invention photonic crystal substrate, a substrate arranged in a photonic crystal having a plurality of cylindrical through-hole periodic crystal lattice structure in the thickness direction, the main crystal forming a main optical waveguide for passing the light in the direction perpendicular to the photonic crystal substrate lattice defects; And the light passing through the main optical waveguide from the light of a particular wavelength band coupled to characterized in that it comprises a sub crystal lattice defects that form the sub-light guide to pass in a direction perpendicular to the photonic crystal substrate.
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