Complex-amplitude modulation diffractive optical element performed by aperturevariations on a reflective aluminum layer deposited over avariable thickness SiO_2 substrate

摘要

Direct modulation of complex amplitude is obtained by aperture variations on a reflective aluminum layer deposited over a variable thickness SiO_2 substrate. The magnitude modulation is controlled by the aperture area, and the phase modulation is controlled by the thickness of the SiO_2 substrate.