Fraunhofer Diffraction

Fraunhofer Diffraction

Quadratic Phase Factor𝑁𝑁𝐹𝐹 = 200 𝑁𝑁𝐹𝐹 = 20

𝑁𝑁𝐹𝐹 = 0.2𝑁𝑁𝐹𝐹 = 2

In general, moving into the Fresnel region means we need to calculate the fields numerically. In this case, you need to be wary of the sampling of this quadratic phase exponential to ensure accurate calculations.

Fresnel Diffraction

Fresnel Diffraction

Fresnel Diffraction

Fresnel Zone Plate

Phase Reversal Zone Plate

Kinoform Diffractive lens

These are not the same

Fresnel Lens (Refractive)Diffractive Lens (Kinoform)

201912160903.pdfOPTI512 138_151.pdf201911260952.pdfFraunhoferFresnel Diffraction.pdfFraunhofer DiffractionFraunhofer DiffractionQuadratic Phase FactorFresnel DiffractionFresnel DiffractionFresnel DiffractionFresnel Zone PlatePhase Reversal Zone PlateKinoform Diffractive lensThese are not the same