| 摘要 |
PURPOSE:To obtain a larger angel of light polarization by forming a transparent conductive film on the surface of a transparent substrate, providing a period structure in an optical waveguide layer or on the boundary between the optical waveguide layer and a liquid crystal layer, and forming the transparent substrate from a concave lens. CONSTITUTION:A laser beam 32 from a semiconductor layer 31 is entered into a waveguide layer 4 through a light collecting lens 33 by a concentrical circular grating coupler 4F to form a waveguide light 8, and the waveguide light 8 is made into a radiating light 9 by a concentrical circular grating coupler 4G. The radiating light 9 is collected in a point F1 on a central axis passing a point O through a liquid crystal layer 5 and a concave lens 27. The position of the light collecting point on the central axis 10 is changed to F2 by a voltage signal applied between a conductive thin film 2 and a transparent conductive thin film 6. The deflecting angle (the angle formed by 29a and 29b) is amplified by the refracting action of the concave lens, and forms an angle larger than the diffracting angle change quantity (the angle formed by 9a and 9b) by the grating 4G. |
