Case 13051

Multiple Wavelength Binary Diffractive Elements


Diffractive optics, dichromat and trichromat fabrication, nonlinear optimization


Optical tweezers for manipulating particles with low refractive index and trapping cold atoms, locating faint planets orbiting stars, optical-projection photolithography


Difficult fabrication of diffractive optics due to multiple levels of phase-height or to large aspect ratios


This invention describes a method for designing multiple wavelength binary diffractive lenses based on nonlinear optimization using genetic algorithms. These algorithms are appropriate to solve problems that are not well-suited for standard optimization algorithms such as when the energy function is discontinuous, non-differential or highly nonlinear. The invention includes a design for a dichromat, a lens that focuses one wavelength to a bright spot and a second wavelength to an overlapping ring-shaped point. It is a critical element in imaging schemes from breaking the far-field diffraction limit. The proposed technique can also be extended to design a trichromat.

  • Ease of fabrication of diffractive optics
  • Ability to extend application to more than two wavelengths

  • Rajesh Menon (Research Laboratory of Electronics, MIT)
  • Paul Rogge (Research Laboratory of Electronics, MIT)
  • Hsin-Yu Tsai (Research Laboratory of Electronics, MIT)

Intellectual Property:

U.S. Patent Number 8,049,963; filed November 1, 2011



Last revised: April 30, 2013

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