| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a planar waveguide having a small-sized hybrid lens having a large NA and a little loss. <P>SOLUTION: This planar waveguide includes: a clad layer; a core layer superposed on the surface side of the clad layer and having a refractive index higher than that of the clad layer; and a hybrid lens section formed on the surface or the interior of the core layer, having a refractive index higher than that of the clad layer, and having a different refractive index from that of the core layer. The hybrid lens section of this planar waveguide includes: a geometric grating part, which is a diffractive lens, or a dioptric lens part, which is symmetric about an optical axis and has a substantially serrate shape whose intervals become narrower as it separates farther from the optical axis; and a VP grating part, which is a diffractive lens, provided distant from the optical axis with respect to the geometric grating part or the dioptric lens part, and whose intervals become narrower as it separates farther from the optical axis. <P>COPYRIGHT: (C)2012,JPO&INPIT |
