| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical coupler which can be easily manufactured at low cost. <P>SOLUTION: An optical coupler 1 includes a quartz substrate 10, and metal films 11, 12 made of Ag, which are respectively formed on both surfaces of the quartz substrate 10. The metal film 11 is formed on one surface 10a of the quartz substrate 10, and the metal film 12 is formed on a whole area of the other surface 10b of the quartz substrate 10. Multiple holes 13 penetrating the metal layer 11 are formed in the metal layer 11. A cross section of the holes 13 on a surface parallel to the main surface of the quartz substrate 10 is a circular shape. A diameter of the holes 13 is 150 nm. The holes 13 are arranged in a square lattice shape, and a gap between the adjacent holes 13 is 500 nm. In the optical coupler 1, a part of incident light 14 in the quartz substrate 10 can be emitted as branch light 15 in a direction of 111° with respect to a propagation direction of the incident light 14. <P>COPYRIGHT: (C)2012,JPO&INPIT |
