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Poynting vector profile of a tightly focused radially polarized beam in the presence of primary aberrations.

The Poynting vector profile of a tightly focused radially polarized beam has some unique and interesting properties. For instance the light on the optical axis in the focal volume corresponds to a null Poynting vector, indicating the light there to be nonpropagating. However, the beam here is considered to be an unaberrated one. Thus it will be important to know whether the commonly occurring monochromatic aberrations can have any effect on the ideal Poynting vector profile of a radially polarized beam. In this paper we make use of the Fourier transform form of the vectorial diffraction theory to investigate the effect of primary aberrations on the Poynting vector profile of a radially polarized beam under tight focusing conditions. We present here the results from our study on the behavior of both the time averaged and time dependent Poynting vector profiles in the focal volume.