Abstract
Based on the vector diffraction theory, the effect of phase modulation on the intensity distribution of double ring shaped radially polarized beam(R-TEM11*) in the focal region of high NA lens is investigated theoretically. It is observed that a properly designed complex phase filter can generate a sub wavelength focal spot having FWHM of 0.3λ with an extended focal depth of 10λ. Apart from generating focal spot segment with large focal depth, it is also observed that a properly designed complex phase filter also generate optical cage, multiple focal spot segment useful for the manipulation of optical trapping.
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Prabakaran, K., Rajesh, K.B., Pillai, T.V.S. et al. Tight focusing of phase modulated double ring shaped radially polarized beam with high NA lens. J Opt 42, 382–387 (2013). https://doi.org/10.1007/s12596-013-0139-8
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DOI: https://doi.org/10.1007/s12596-013-0139-8