Issue |
EPL
Volume 85, Number 4, February 2009
|
|
---|---|---|
Article Number | 47001 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/85/47001 | |
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: gquinteiro@df.uba.ar
Received:
20
November
2008
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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