Stimulated Brillouin scattering in nanophotonic waveguides and resonators

Mirnaziry, Sayyed Reza

Stimulated Brillouin scattering in nanophotonic waveguides and resonators

Mirnaziry, Sayyed Reza

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Publication Type:: Thesis
Issue Date:: 2018

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Field	Value	Language
dc.contributor.author	Mirnaziry, Sayyed Reza
dc.date.accessioned	2018-04-09T01:35:26Z
dc.date.available	2018-04-09T01:35:26Z
dc.date.issued	2018
dc.identifier.uri	http://hdl.handle.net/10453/123278
dc.description	University of Technology Sydney. Faculty of Science.	en_AU
dc.description.abstract	In this work, we theoretically and numerically study Stimulated Brillouin Scattering (SBS) in integrated waveguides and resonators. We review SBS process by using coupled equations and determine a broad range of SBS parameters including SBS gain, opto-acoustic overlap, optical forces and power conversion between pump and Stokes waves. For numeric analysis, in addition to performing simulations we write appropriate codes and employ different iterative techniques as well as root finding methods to analyze SBS in interested configurations. We study silicon-chalcogenide slot waveguides as a robust candidate to enhance SBS. We explain how constructive contribution of radiation pressure and electrostriction can increase the SBS gain in this structure. We also optimize the waveguide geometry and determine the optimum pump power as well as waveguide length as a function of SBS figure of merit, using our analytic expressions. We also show that putting a silica layer on top of the waveguide lead to a significant increase in the opto-acoustic overlaps and therefore, rise the SBS gain while reducing the impact of nonlinear losses in this structure. We explore SBS in integrated racetrack ring resonators in both regimes of amplifying and lasing. We use analytic and numeric approaches to demonstrate pump and Stokes evolution in designed rings and through the output. In addition we analyze the impact of nonlinear dispersion as well as thermal effects on SBS in rings. Finally, we determine the pump power to achieve Stokes amplification, the threshold pump power for lasing and the output Stokes power in the presence of linear and nonlinear optical losses.	en_AU
dc.format	Thesis (PhD)
dc.language.iso	en_AU	en_AU
dc.relation	https://opus.lib.uts.edu.au/bitstream/10453/123278/7/02whole.pdf
dc.rights	The author owns the copyright in this thesis including all reproduction and reuse rights for the work. The work may not be altered without the permission of the copyright owner. Attribution is essential when quoting or paraphrasing from this thesis.
dc.rights	au.edu.uts.lib/ppc
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Stimulated Brillouin scattering in nanophotonic waveguides and resonators	en_AU
dc.type	Thesis	en_AU
utslib.copyright.status	open_access

Abstract:

In this work, we theoretically and numerically study Stimulated Brillouin Scattering (SBS) in integrated waveguides and resonators. We review SBS process by using coupled equations and determine a broad range of SBS parameters including SBS gain, opto-acoustic overlap, optical forces and power conversion between pump and Stokes waves. For numeric analysis, in addition to performing simulations we write appropriate codes and employ different iterative techniques as well as root finding methods to analyze SBS in interested configurations. We study silicon-chalcogenide slot waveguides as a robust candidate to enhance SBS. We explain how constructive contribution of radiation pressure and electrostriction can increase the SBS gain in this structure. We also optimize the waveguide geometry and determine the optimum pump power as well as waveguide length as a function of SBS figure of merit, using our analytic expressions. We also show that putting a silica layer on top of the waveguide lead to a significant increase in the opto-acoustic overlaps and therefore, rise the SBS gain while reducing the impact of nonlinear losses in this structure. We explore SBS in integrated racetrack ring resonators in both regimes of amplifying and lasing. We use analytic and numeric approaches to demonstrate pump and Stokes evolution in designed rings and through the output. In addition we analyze the impact of nonlinear dispersion as well as thermal effects on SBS in rings. Finally, we determine the pump power to achieve Stokes amplification, the threshold pump power for lasing and the output Stokes power in the presence of linear and nonlinear optical losses.

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http://hdl.handle.net/10453/123278