Optical structures with reduced diffraction and methods of making and using

摘要: An optical device that includes a metal film defining an aperture through the film, plurality of first concentric ridges formed around on side film. Each pair adjacent are spaced apart by period, p1, and each ones second p2. In at least some instances, n1p1 is within 10% n2p2, where n1 index refraction material n2 The optionally apertures. two or more, even all, apertures have those may be used as polarizer wavelength filter.