Brillouin scattering induced transparency and generation of slow and fast light

Kim, Jun Hwan

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

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

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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