Credit: Light: Advanced Manufacturing
a Schematic of the spatial light modulator (SLM)-based two-photon polymerization (2PP) system. HWP, half-wave plate; BE, beam expander; M1 and M2, mirrors; SLM, spatial light modulator; ND, neutral density filter; L, lens; MO, microscope objective. b Illustration of the phase mask loaded on the SLM, comprising the phase of LDoF beams and a blazed grating. c Partial enlargement of the focal region, showing the relative position of the LDoF beams and the photoresist. The blue dashed box indicates the region where two-photon absorption occurs. d Scanning electron microscopy (SEM) image of the crisscross structure. Scale bar = 10 μm.