By. Zeldovich et al., OBSERVED TRANSVERSE SHIFT OF A FOCAL SPOT UPON A CHANGE IN THE SIGN OF CIRCULAR-POLARIZATION, JETP letters, 59(11), 1994, pp. 766-769
This transverse shift DELTAx approximately +/-sigma was observed exper
imentally when half of a lens (y>0) was illuminated by a circularly po
larized plane wave (e(x) + isigmae(y))exp(ikz). The observation was ca
rried out in z-polarized scattered light.