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VOLUME 59 | ISSUE 4 | PAGE 216
Transverse shift of a focal spot due to switching of the sign of circular polarization
An axially symmetric optical lens made of isotropic material produces a transverse shift Ax oc σλ/2π of the focal spot "center of gravity" under the switch of circular polarisation sign σ ±1 of a plane incident wave (* +ǣ) exp(tfcz). It may be done, if mostly upper (y > 0) half of^ the input plane is illuminated. This simple effect is discussed in a general context of the photon's spin-orbit interaction.