Accurate simulation from digital, submicron, optical elements is obtained by finite difference time domain (FDTD) results that\nare phase analyzed as sources for Huygens wavelets on fine scales much shorter than the wavelength used. Results, from the MIT\nelectromagnetic evaluation program, are renormalized by a method here called ââ?¬Å?refractive impulse.ââ?¬Â This is valid for polarized\nresponses from digital diffractive and focusing optics. The method is employed with plane wave incidence at any angle or with\ndiverging or converging beams. It is more systematic, more versatile, and more accurate than commercial substitutes.
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