Normalization of field intensity
This protocol is extracted from research article:
Optical pulling at macroscopic distances
Sci Adv, Mar 29, 2019; DOI: 10.1126/sciadv.aau7814

A number of incident beams were adopted in this study. For Eqs. 4 to 6, the intensity at the beam center was normalized to 1 mW μm−2. This normalization could not be applied to the m = 0 azimuthally polarized Bessel beam given in Eq. 3 because it had a dark center along the beam axis. Thus, we normalized the intensity maximum of the beam to 1 mW μm−2. We note that 1 mW μm−2 was a modest intensity, and we were more concerned about the direction of the force than its exact magnitude.

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