Phys.org August 1, 2024
Researchers at UC California developed a pyramid-structured diffractive optical network design (P-D2NN), optimized specifically for unidirectional image magnification and demagnification. The diffractive layers were pyramidally scaled in alignment with the direction of the image magnification or demagnification, to inhibit image formation in the opposite direction, thus achieved the desired unidirectional imaging operation using a much smaller number of diffractive degrees of freedom within the optical processor volume. The design maintained its unidirectional image magnification/demagnification functionality across a large band of illumination wavelengths. It allowed a unidirectional magnifier and a unidirectional demagnifier operation simultaneously in opposite directions, at two distinct illumination wavelengths. By cascading multiple unidirectional P-D2NN modules, they could achieve higher magnification factors. The efficacy of the architecture was validated experimentally… read more. Open Access TECHNICAL ARTICLEÂ
Schematic of pyramid diffractive optical networks for unidirectional image magnification… Credit: Light: Science & Applications volume 13, Article number: 178, 31 July 2024