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Schematics of a 4π high-NA objective lens-focusing configuration integrated with MPFs encoded by phase-only SLMs under the illumination of two counter-propagating CPBG beams. An MO medium locates at the confocal plane (Oc) of the proposed system. Bottom illustration: a 3 × 3 × 3 3D super-resolution pure-longitudinal MS array. O1, O2: objective lenses. LCPBG: left-hand circularly polarized Bessel Gaussian.
