| 摘要 |
The optical element of the present invention has a waveguide part and a deflecting part. The waveguide part is formed in a plate shape having first and second flat surfaces facing each other. A first light incident at a predetermined angle between the first and second flat surfaces is propagated while being reflected. The deflecting part is formed in a plate shape having a third flat surface opposite the first flat surface. The first flat surface and the third flat surface are spaced apart at an interval less than the propagation distance for which an evanescent wave of the first light propagates with a predetermined transmittance in the deflecting part. A plurality of reflecting surfaces are arranged in the length direction along a back side of the third flat surface in the deflecting part. The reflecting surfaces reflect the first light, which is incident on the first flat surface at a predetermined angle and propagated as an evanescent wave, in a direction essentially perpendicular to the first flat surface. The refractive index of a medium between the first flat surface and the third flat surface is lower than the refractive index of the waveguide part. |
