| 摘要 |
<p>A metallic layer (52, 62) is used with a prism to provide a surface plasmon wave under total reflection conditions of an incident light of predetermined wavelength outside the visible spectrum. The metal layer is selected with a refractive index as small as possible and an extinction coefficient as large as possible within the wavelength of interest and is covered with a solid dielectric layer (54, 64) characterized by predetermined optical parameters. This layer plays the role of a light waveguide that generates waveguide modes coupled to surface plasmons, resulting in a new set of resonances excited by both p- and s-polarized excitation light and characterized by much narrower spectra than produced by conventional SPR. In a particular embodiment of the invention, the dielectric layer may be designed to serve both as a waveguide and at the same time as an electrode.</p> |
