Axial field shaping under high-numerical-aperture focusing
Abbreviated Journal Title
2-PHOTON SCANNING MICROSCOPY; GENERALIZED PROJECTIONS; VECTOR; DIFFRACTION; SUPERRESOLUTION; FILTERS; HOLOGRAMS; ELEMENTS; DESIGN; BEAMS; Optics
Kant reported [J. Mod. Optics 47, 905 (2000)] a formulation for solving the inverse problem of vector diffraction, which accurately models high-NA focusing. Here, Kant's formulation is adapted to the method of generalized projections to obtain an algorithm for designing diffractive optical elements (DOEs) that reshape the axial point-spread function (PSF). The algorithm is applied to design a binary phase-only DOE that superresolves the axial PSF with controlled increase in axial sidelobes. An 11-zone DOE is identified that axially narrows the PSF central lobe by 29% while maintaining the sidelobe intensity at or below 52% of the peak intensity. This DOE could improve the resolution achievable in several applications without significantly complicating the optical system. (c) 2007 Optical Society of America.
"Axial field shaping under high-numerical-aperture focusing" (2007). Faculty Bibliography 2000s. 7255.