The superposition of two coaxial Gaussian beams with offset foci and orthogonal linear polarizations can be used to produce a right- or left- circular polarization component with a focal spot of volume smaller than that of the Gaussian beam. This polarization-assisted axial and transverse superresolution effect is attributed to the differential Gouy phase shift within the focal region or to the non-Gaussian annular distribution of the circularly-polarized components in the far field.
© 2003 Optical Society of America
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