| 摘要 |
The invention is notably directed to an electromagnetic wave resonator (10) comprising a body (29), wherein the body: - has a structure extending essentially in a plane (r, ?), - comprises a material in a region between limit radii r i and ro, where 0 = r i o and r o corresponds to a radius of a convex hull (Co) of the structure; and - allows for electromagnetic wave propagation, and wherein an effective refractive index n e (r), as obtained from angularly averaging a refractive index of the material in the plane (r, ?), decreases within said region. |
