Acoustic build-up in on-chip stimulated Brillouin scattering

Wolff, C; Steel, MJ; Eggleton, BJ; Poulton, CG

Acoustic build-up in on-chip stimulated Brillouin scattering

Wolff, C

Steel, MJ Eggleton, BJ Poulton, CG

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Publication Type:: Journal Article
Citation:: Scientific Reports, 2015, 5
Issue Date:: 2015-09-04

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Field	Value	Language
dc.contributor.author	Wolff, C https://orcid.org/0000-0002-5759-6779	en_US
dc.contributor.author	Steel, MJ	en_US
dc.contributor.author	Eggleton, BJ	en_US
dc.contributor.author	Poulton, CG https://orcid.org/0000-0002-2707-3424	en_US
dc.date.available	2015-07-27	en_US
dc.date.issued	2015-09-04	en_US
dc.identifier.citation	Scientific Reports, 2015, 5	en_US
dc.identifier.uri	http://hdl.handle.net/10453/37623
dc.description.abstract	We investigate the role of the spatial evolution of the acoustic field in stimulated Brillouin scattering processes in short high-gain structures. When the gain is strong enough that the gain length becomes comparable to the acoustic wave decay length of order 100 microns, standard approximations treating the acoustic field as a local response no longer apply. Treating the acoustic evolution more accurately, we find that the backward SBS gain of sub-millimetre long waveguides is significantly reduced from the value obtained by the conventional treatment because the acoustic mode requires several decay lengths to build up to its nominal value. In addition, the corresponding resonance line is broadened with the development of side bands. In contrast, we argue that intra-mode forward SBS is not expected to show these effects. Our results have implications for several recent proposals and experiments on high-gain stimulated Brillouin scattering in short semiconductor waveguides.	en_US
dc.relation	http://purl.org/au-research/grants/arc/CE110001018
dc.relation	http://purl.org/au-research/grants/arc/DP130100832
dc.relation.ispartof	Scientific Reports	en_US
dc.relation.isbasedon	10.1038/srep13656	en_US
dc.title	Acoustic build-up in on-chip stimulated Brillouin scattering	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.for	0205 Optical Physics	en_US
utslib.for	0105 Mathematical Physics	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	open_access
pubs.publication-status	Published	en_US
pubs.volume	5	en_US

Abstract:

We investigate the role of the spatial evolution of the acoustic field in stimulated Brillouin scattering processes in short high-gain structures. When the gain is strong enough that the gain length becomes comparable to the acoustic wave decay length of order 100 microns, standard approximations treating the acoustic field as a local response no longer apply. Treating the acoustic evolution more accurately, we find that the backward SBS gain of sub-millimetre long waveguides is significantly reduced from the value obtained by the conventional treatment because the acoustic mode requires several decay lengths to build up to its nominal value. In addition, the corresponding resonance line is broadened with the development of side bands. In contrast, we argue that intra-mode forward SBS is not expected to show these effects. Our results have implications for several recent proposals and experiments on high-gain stimulated Brillouin scattering in short semiconductor waveguides.

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http://hdl.handle.net/10453/37623