METHOD FOR EXCITING A SUB-WAVELENGTH INCLUSION STRUCTURE

摘要

The invention concerns a method for exciting a sub-wavelength inclusion structure, comprising: providing a first medium having a first refractive index ni and a second medium having a second refractive index nt, wherein ni>nt, wherein the sub-wavelength inclusion structure is arranged at a boundary between the first and second media, wherein the sub-wavelength inclusion structure exhibits polarizability properties; and directing light through the first medium towards the sub-wavelength inclusion structure. The angle of the incident light to the normal of the boundary, θi, is such that, for a given set of: frequency of the light; surface density of inclusions; average polarizability of the inclusion structure at the frequency; first refractive index; and second refractive index, θi fulfils at least one of the relations for s-polarized light and for p-polarized light described herein.

主权项

1. Method for exciting a sub-wavelength inclusion structure (3), comprising the step of:
providing a first medium having a first refractive index ni and a second medium having a second refractive index nt, wherein ni>nt wherein the sub-wavelength inclusion structure is arranged at a boundary between the first and second media, wherein the sub-wavelength inclusion structure exhibits polarizability properties, and directing light through the first medium towards the sub-wavelength inclusion structure, wherein the angle of the incident light to the normal of the boundary, θi, is such that it, for a given set of: frequency of the light ω; surface density of inclusions ρ; average polarizability a of the inclusion structure at the frequency ω; first refractive index ni; and second refractive index nt,fulfills at least one of:
the following relation for s-polarized light:ωcρα(ω)=ntcosθt+inicosθi, and; the following relation for p-polarized light:ωcρα(ω)=-ntcosθt+inicosθi,where c is the speed of light in vacuum, where i is the imaginary unit, and where θt is the light propagation angle in the second medium determined by the law of refraction:
nt sin θt=ni sin θi.