Abstract
The intensity distributions near the focal point for radially polarized laser beams including higher-order transverse modes are calculated based on vector diffraction theory. For higher-order radially polarized mode beams as well as a fundamental mode beam, the strong longitudinal component forms a sharper spot at the focal point under a high-NA focusing condition. In particular, double-ring-shaped radially polarized mode beams can effectively reduce the focal spot size because of destructive interference between the inner and the outer rings with π phase shift. Compared with an beam focusing in a limit of , the full width at half-maximum values of the focal spot for an beam are decreased by 13.6% for the longitudinal component and 25.8% for the total intensity.
© 2007 Optical Society of America
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