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Reduction of focal-spot size using dichromats in absorbance modulation
Hsin-Yu Tsai1, Henry I Smith, Rajesh Menon
1Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, USA. sidney_t@mit.edu
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.
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