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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