Theory of the optical absorption of light carrying orbital angular momentum by semiconductors

Details Theory of the optical absorption of light carrying orbital angular momentum by semiconductors Theory of the optical absorption of light carrying orbital angular momentum by semiconductors

2008-07-28

arxiv.org/abs/0807.4513v1

EPL (Europhysics Letters) 85, 47001 (2009)

Physics

Condensed Matter

Other Condensed Matter

Submitted to Phys. Rev. Lett. (23 Jan 2008)

Scientific paper

10.1209/0295-5075/85/47001

We develop a free-carrier theory of the optical absorption of light carrying orbital angular momentum (twisted light) by bulk semiconductors. We obtain the optical transition matrix elements for Bessel-mode twisted light and use them to calculate the wave function of photo-excited electrons to first-order in the vector potential of the laser. The associated net electric currents of first and second-order on the field are obtained. It is shown that the magnetic field produced at the center of the beam for the $\ell=1$ mode is of the order of a millitesla, and could therefore be detected experimentally using, for example, the technique of time-resolved Faraday rotation.

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