title: Reduction of focal-spot size using dichromats in absorbance modulation.
abstract: We experimentally verify the focusing characteristics of dichromats, a new class of circular-symmetric diffractive-optical lenses that generate, in the same focal plane, focal spots for one wavelength and ring-shaped spots with central nodes for another wavelength. Using a dichromat, we illuminate a thin photochromic layer and demonstrated point-spread-function compression of the transmitted focal spot.
authors.affiliation: Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. sidney_t@mit.edu
authors.forename: Hsin-Yu
authors.initials: HY
authors.lastname: Tsai
authors.forename: Henry I
authors.initials: HI
authors.lastname: Smith
authors.forename: Rajesh
authors.initials: R
authors.lastname: Menon