Abstract
The Goos and Hanchen experiments of 1947 have shown that in total reflection the photons tunnel through the second medium (which we take to be the vacuum), whence a longitudinal shift Δx; Imbert's experiments of 1970 have shown that if the incident beam is circularly polarized there is also a transverse shift Δz, the sign of which depends on the helicity sign. We briefly explain this new phenomenon, first in terms of a generalized geometrical optics where the velocity and momentum of a spinning photon are non-collinear, then in terms of wave optics, using an appropriate class of solutions of Maxwell's equations.
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