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Suspended mid-infrared waveguides for stimulated Brillouin scattering

Suspended mid-infrared waveguides for stimulated Brillouin scattering
Suspended mid-infrared waveguides for stimulated Brillouin scattering

We theoretically investigate a new class of silicon waveguides for achieving Stimulated Brillouin Scattering (SBS) in the mid-infrared (MIR). The waveguide consists of a rectangular core supporting a low-loss optical mode, suspended in air by a series of transverse ribs. The ribs are patterned to form a finite quasi-one-dimensional phononic crystal, with the complete stopband suppressing the transverse leakage of acoustic waves, confining them to the core of the waveguide. We derive a theoretical formalism that can be used to compute the opto-acoustic interaction in such periodic structures, and find forward intramodal-SBS gains up to 1750 m-1 W-1 , which compares favorably with the proposed MIR SBS designs based on buried germanium waveguides. This large gain is achieved thanks to the nearly complete suppression of acoustic radiative losses.

1094-4087
4976-4989
Schmidt, M.K.
8515ec8d-eb84-4721-93b2-11ce69444d72
Poulton, C.G.
46bdb011-c3ad-4662-a8a7-673d881b8d54
Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
Eggleton, B.J.
24193e78-8e3e-4777-85f1-a2aaf95006ba
Steel, M.J.
2ad21a11-9a25-496f-8c99-ac0968018291
Schmidt, M.K.
8515ec8d-eb84-4721-93b2-11ce69444d72
Poulton, C.G.
46bdb011-c3ad-4662-a8a7-673d881b8d54
Mashanovich, G.Z.
c806e262-af80-4836-b96f-319425060051
Reed, G.T.
ca08dd60-c072-4d7d-b254-75714d570139
Eggleton, B.J.
24193e78-8e3e-4777-85f1-a2aaf95006ba
Steel, M.J.
2ad21a11-9a25-496f-8c99-ac0968018291

Schmidt, M.K., Poulton, C.G., Mashanovich, G.Z., Reed, G.T., Eggleton, B.J. and Steel, M.J. (2019) Suspended mid-infrared waveguides for stimulated Brillouin scattering. Optics Express, 27 (4), 4976-4989. (doi:10.1364/OE.27.004976).

Record type: Article

Abstract

We theoretically investigate a new class of silicon waveguides for achieving Stimulated Brillouin Scattering (SBS) in the mid-infrared (MIR). The waveguide consists of a rectangular core supporting a low-loss optical mode, suspended in air by a series of transverse ribs. The ribs are patterned to form a finite quasi-one-dimensional phononic crystal, with the complete stopband suppressing the transverse leakage of acoustic waves, confining them to the core of the waveguide. We derive a theoretical formalism that can be used to compute the opto-acoustic interaction in such periodic structures, and find forward intramodal-SBS gains up to 1750 m-1 W-1 , which compares favorably with the proposed MIR SBS designs based on buried germanium waveguides. This large gain is achieved thanks to the nearly complete suppression of acoustic radiative losses.

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Accepted/In Press date: 8 January 2019
e-pub ahead of print date: 11 February 2019
Published date: 18 February 2019

Identifiers

Local EPrints ID: 428671
URI: https://eprints.soton.ac.uk/id/eprint/428671
ISSN: 1094-4087
PURE UUID: be80eff3-8bde-4856-8e49-ad8631aa1d02

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Date deposited: 06 Mar 2019 17:30
Last modified: 19 Jul 2019 16:39

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Contributors

Author: M.K. Schmidt
Author: C.G. Poulton
Author: G.T. Reed
Author: B.J. Eggleton
Author: M.J. Steel

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