| 摘要 |
PURPOSE:To achieve focusing and optical modulation simultaneously by forming a linear Fresnel zone plate by using thin-film optical waveguides of electrooptic crystal. CONSTITUTION:A linear Fresnel zone plate is composed of optical waveguides 11, 12- of electrooptic crystal having the (c) axis in a direction 29, and at the no- waveguide part of the Fresnel zone plate, electrodes 21, 22- having lengths l1, l2- proportional to the waveguide width are arranged. So that adjacent electrodes have the opposite phases, voltages are applied to the electrodes, thereby modulating the intensity of focusing light. |
