University of Illinois Urbana-Champaign

Brillouin scattering induced transparency and generation of slow and fast light

Kim, Jun Hwan

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Jun Hwan_Kim.pdf

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https://hdl.handle.net/2142/50494

Description

Title
Brillouin scattering induced transparency and generation of slow and fast light
Author(s)
Kim, Jun Hwan
Issue Date
2014-09-16
Director of Research (if dissertation) or Advisor (if thesis)
Bahl, Gaurav
Department of Study
Mechanical Sci & Engineering
Discipline
Mechanical Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2014-09-16T17:18:01Z
Keyword(s)
  • Brillouin scattering
  • induced transparency
  • nonlinear optics
Abstract
Electromagnetically induced transparency (EIT) is generation of a narrow window in which electromagnetic field absorption is inhibited. Experimentally, a probe tuned to a certain absorption wavelength is allowed to transmit through a gaseous vapor only in the presence of a second control laser. In other words, a probe is forbidden to cause an excitation from one energy level to another through coherent coupling with a third, intermediate energy level that creates an interference pathway. In this study, Brillouin scattering analogue of EIT is demonstrated using the two optical modes that are coupled through a phase matched acoustic mode. The coherent coupling of two energy levels is emulated by the acousto-optic interaction of Brillouin scattering. The probe phase response is analyzed to estimate BSIT's effect on the velocity of light pulse. As BSIT modifies the dispersion of light, it is understood as either slowing or advancing light propagation depending on the sign of the slope of the probe phase response. Lastly, the non-reciprocity of Brillouin scattering is theoretically considered. The non-reciprocity, or a break in time reversal symmetry, is a unique property of Brillouin scattering process due to the traveling surface acoustic wave which is used for phase matching the optical modes. Therefore, BSIT can be used for applications such as optical isolation while no other transparency systems can.
Graduation Semester
2014-08
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http://hdl.handle.net/2142/50494
Copyright and License Information
Copyright 2014 Jun Hwan Kim

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