Acoustic build-up in on-chip stimulated Brillouin scattering.

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.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Wolff C,Steel MJ,Eggleton BJ,Poulton CG

doi

10.1038/srep13656

subject

Has Abstract

pub_date

2015-09-04 00:00:00

pages

13656

issn

2045-2322

pii

srep13656

journal_volume

5

pub_type

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