| 摘要 |
There is provided a process for producing an optical element comprising a photonic crystal in which spots having different indices are arranged periodically, comprising the step of exposing an optical medium whose refractive index changes by irradiation of light or by a predetermined treatment conducted after the irradiation of light according to the intensity of the applied light to a field where light intensity changes in space at a period of the wavelength order of light and holding the optical medium for a given time, and the step of repeating at least once the step of creating another field where light intensity changes in space at a period of the wavelength order of light by shifting the optical medium. Further, by using a plurality of optical media whose refractive indices change by an external field, the refractive indices of certain two media out of these optical media are caused to be the same or about the same under a certain external field condition. By reflecting the distribution patterns that light senses under these two conditions on a desired crystal structure, shape of a lattice point and period, there can be provided an optical element and an optical demultiplexer that are capable of dynamically switching between two significantly different photonic structures by switching the external field conditions. <IMAGE> |
