Annular pupils, radial polarization, and superresolution.

@article{Sheppard2004AnnularPR,
  title={Annular pupils, radial polarization, and superresolution.},
  author={Colin J R Sheppard and Amarjyoti Choudhury},
  journal={Applied optics},
  year={2004},
  volume={43 22},
  pages={4322-7}
}
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… CONTINUE READING
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