Patent ID: 7113338

Claim:
A thin-film structure comprising: a base on which is disposed a plurality of parallel line-shaped corrugated structures; a plurality of parallel plate-shaped metals provided on said base, said plate-shaped metals being disposed at a fixed angle with a surface of said base, and an end of each plate-shaped metal being in contact with said base along the direction of said line-shaped corrugated structure, wherein an average gap (d) between said plate-shaped metals, a film thickness (H), and an average width (W), in terms of a working wavelength λ, and an angle (θ) relative to said base lie within the following ranges: 0.07λ<d<0.20λ 0.15λ<H<0.90λ 0.05λ<W<0.18λ 0 deg <=θ<=25 deg; said base is formed from a substrate on which the plurality of parallel line-shaped corrugated structures are disposed and a transparent dielectric film of at least one layer is disposed on said substrate; and a surface shape of said line-shaped corrugated structures disposed on said substrate is different from a surface shape of said transparent dielectric film.