| 摘要 |
Operations such as modulation, switching, mode conversion and the like are performed on light propagating in a thin film waveguide by a liquid crystal member overlaying a portion of the waveguide. The material of the crystal is such that its index of refraction in the direction of wave propagation, and normal thereto, is varied by application of an electric field, thereby producing a variation in the waveguiding properties of the waveguide. Using the same principles, mode filtering is achieved by overlaying a portion of the waveguide with an anisotropic material. |
