Volume 85, Number 4, February 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||16 February 2009|
Theory of the optical absorption of light carrying orbital angular momentum by semiconductors
Departamento de Física “J. J. Giambiagi”, Universidad de Buenos Aires - Ciudad Universitaria, Pabellón I, C1428EGA, Ciudad de Buenos Aires, Argentina
Corresponding author: firstname.lastname@example.org
Accepted: 25 January 2009
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 = 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.
PACS: 78.20.Bh – Theory, models, and numerical simulation / 78.20.Ls – Magnetooptical effects / 78.40.Fy – Semiconductors
© EPLA, 2009
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