3. Binarized Fresnel lens (or zoned grating)
We have already seen (§ 2 ) that the pinhole remains a limited optical component in terms of aperture and focusing power. To improve these two points, a surface can be coded using a succession of circular rings alternately opaque and transparent, or alternately etched and unetched (the etched and unetched areas having a phase difference of π). The various zones are distributed or etched so that transmitted light interferes constructively...
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Binarized Fresnel lens (or zoned grating)
Photon screens and the antisymmetric phase grating
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