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Appl Opt. 2004 Aug 1;43(22):4322-7.

Annular pupils, radial polarization, and superresolution.

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Division of Bioengineering, National University of Singapore, Engineering Drive, Singapore.


An annular pupil, which can be used to produce a Bessel beam, when combined with radially polarized illumination promises improvements in microscope resolution, increased packing density for optical storage, and finer optical lithography. When combined with a circular detection pupil in confocal microscopy a point-spread function 112 nm wide results (lambda = 488 nm). Radially polarized annular illumination of a solid-immersion lens can yield a focal spot smaller than 100 nm for lambda = 488 nm. Use of radially polarized illumination with pupil masks is discussed.


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