Figure 1
(a) An example of a conventional kinoform lens design, also called a `long kinoform'. (b) An example of a `short kinoform' lens that is more practical for compound lenses made via the planar nanofabrication approach. (c) and (d) Schematic demonstration of modifying the numerical aperture (and of the resolution) in a compound lens set-up. Design and nanofabrication ensure that each kinoform lens in a compound kinoform optics is slightly different from the preceding one. |