Patent ID: 7746550

Claim:
A single resonance filter having a single transmission resonance wavelength using shape resonance with a high transmittance, the resonance filter comprising: a substrate having a first surface and a second surface; and a periodic or random array of through-holes formed so as to pass through the first surface and the second surface, the through-hole having a size of subwavelength and a symmetrical shape with respect to a polarization direction of incident light toward the first surface, wherein a single transmission resonance wavelength is determined by the shape of the through-hole, and wherein the symmetrical shape includes a square shape, a rectangular shape, a circular shape, a slit shape, or a combination thereof, the resonance filter further comprising two metallic layers placed on the first surface of the substrate, one metallic layer being fixed and the other metallic layer being adjusted along a direction perpendicular to the polarization direction such that incident light can continuously recognize the variations in length of the rectangular shape in the direction perpendicular to the polarization directions, thereby the single transmission resonance wavelength is continuously varying.