| 摘要 |
<P>PROBLEM TO BE SOLVED: To implement a reflection mirror which has low loss and strong wavelength selectivity for diverging and converging light waves and has high reflectivity, with a simple structure in the field of microphotonic elements. <P>SOLUTION: A high-refractive index thin film layer having refractive-index periodic structures is formed on a substrate having the same curvature as a light wave to be controlled to achieve low loss, strong wavelength selectivity, and high reflectivity. A guided mode resonance phenomenon that light diffracted into a guided mode by periodic structures and propagated in the high-refractive index layer is resonantly reflected to the incidence side is utilized. When a curvature radius of the substrate is equal to or less than about 5 times the intervals of periodic structures, reflectivity at a resonance wavelength can be kept at 90% or more. Minimum requirements for operation of this structure are only a substrate made of a low-refractive index medium and a diffraction grating layer made of a high-refractive index medium, so that an element can be implemented with a much simpler configuration than a dielectric multilayer reflection mirror or the like. <P>COPYRIGHT: (C)2013,JPO&INPIT |
