Fig. 3: Complex opto-magnetic holograms with detour-phase encoding.
a Simulation of classical detour-phase encoding using the Lohmann method. The heights and offsets of rectangular apertures are linear functions of the amplitude and phase values from a given CGH cell, respectively. Suppression of the conjugated images is notable. b From left to right: the approximation of the rectangular Lohmann openings with multiple point-by-point exposures switching magnetic spots of fixed diameters; fragment of written magnetic pattern; experimentally acquired diffraction image showing asymmetrical visibility of higher-order image duplicates (marked by a dashed yellow rectangle) originating from regularly spaced Lohmann cells. c From left to right: visualization of the writing of three adjacent Lohmann cells with circular switched magnetic spots of diameters set by in-the-loop modulation of the pump beam intensity (see Fig. 1); fragment of written magnetic pattern; experimental reconstruction showing the symmetrical suppression of higher-order image duplicates. The diffractive efficiency is estimated at 1%. The size of magnetic pattern images is 320 × 320 µm2.
