Tight focusing with a binary microaxicon.

نویسندگان

  • V V Kotlyar
  • S S Stafeev
  • L O'Faolain
  • V A Soifer
چکیده

Using a near-field scanning microscope (NT-MDT) with a 100 nm aperture cantilever held 1 μm apart from a microaxicon of diameter 14 μm and period 800 nm, we measure a focal spot resulting from the illumination by a linearly polarized laser light of wavelength λ=532 nm, with its FWHM being equal to 0.58λ, and the depth of focus being 5.6λ. The rms deviation of the focal spot intensity from the calculated value is 6%. The focus intensity is five times larger than the maximal illumination beam intensity.

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عنوان ژورنال:
  • Optics letters

دوره 36 16  شماره 

صفحات  -

تاریخ انتشار 2011