| 摘要 |
<p>The invention concerns a polarizing device comprising:
- a non-metallic substrate (1) of refractive index n s ,
- a dielectric multilayer mirror (2),
- a corrugated grating layer (6) of local period A, and
- a cover medium (3) of refractive index n c ,
wherein said local period is selected such that upon substantially normal incidence from the cover medium there is no diffraction order other than the 0 th reflected order in the cover medium and such that the field of the +1 st and -1 st orders diffracted into the layers of the multilayer and into the substrate have a non-evanescent propagating character, the multilayer being arranged such that the +/-1 st order TE polarized components diffracted by the grating experience close to 100% reflection and the +/-1 st order TM polarized components diffracted by the grating experience small reflection and leak into the substrate. In particular, said local period A of the grating is arranged such that the +1 st and -1 st orders diffracted in said multilayer impinge at the interfaces between layers under essentially Brewster incidence.</p> |
