Reduction of focal-spot size using dichromats in absorbance modulation.
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.
Tsai
Hsin-Yu
HY
Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. sidney_t@mit.edu
Smith
Henry I
HI
Menon
Rajesh
R