Abstract
A Schrödinger-like equation for an approximate description of polarization for a photon propagating in a helix has been obtained. The analytical solution is employed to study the nonadiabatic Berry's phase. A new expression for Berry's phase is given, indicating a close link between the Berry's phase and spin-alignment. Two kinds of experiments are suggested to measure the nonadiabatic Berry's phase.
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References
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In a private communication, Dr. R. Y. Chiao suggested another experiment. Inject a beam of laser with strong power into a circular waveguide tube that is suspended on a sensitive string such that even a very tiny torque can make it rotating. Since the nonadiabatic Berry's phase is related to spin-alignment, a rotation of the waveguide tube will accompany the nonadiabatic Berry's phase of the laser due to the angular momentum conservation.