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Tailorable stimulated Brillouin scattering in a partially suspended aluminium nitride waveguide in the visible range

Tailorable stimulated Brillouin scattering in a partially suspended aluminium nitride waveguide in the visible range
Tailorable stimulated Brillouin scattering in a partially suspended aluminium nitride waveguide in the visible range
Stimulated Brillouin scattering (SBS) has been widely applied in narrow line-width laser, microwave filters, optical gyroscopes and other fields. However, most research is limited within near-infrared to mid-infrared range. This is due to the limited transparent window in most materials, such as silicon and germanium. Aluminium Nitride (AlN) is a novel III-V material with a wide transparent window from 200 nm and an appropriate refractive index to confine the light. In this paper, we first validate the full-vectorial formalism to calculate SBS gain based on the measured results from a silicon platform. Compared to previous researches, our model achieves higher accuracy in terms of frequency, Q factor as well as Brillouin gain coefficient without modifying the waveguide width. It also reveals the importance of matching rotation matrix and crystalline coordinate system. Then, we investigate the SBS in a partially suspended AlN waveguide at 450 nm based on the validated method. It shows a wide tunability in frequency from 16 GHz to 32 GHz for forward SBS and a range from 42 GHz to 49 GHz for backward SBS. We numerically obtain the value of Brillouin gain of 1311 W−1m−1 when Q factor is dominated by anchor loss for forward SBS of TE mode. We also find out that in the case for forward SBS of TM mode, anchor loss could be greatly suppressed when the node point of the selected acoustic mode matches with the position of pillar anchor. Our findings pave a new way to obtain Brillouin-related applications in integrated photonic circuit within the visible range.
Brillouin scattering, Perfectly matched layer, aluminium nitride
1094-4087
27092-27108
Li, Peng
02f3a864-8335-4976-b9ff-d40f7fcb3f63
Yan, Jize
786dc090-843b-435d-adbe-1d35e8fc5828
Ou, Jun-Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Mashanovich, Goran
c806e262-af80-4836-b96f-319425060051
Li, Peng
02f3a864-8335-4976-b9ff-d40f7fcb3f63
Yan, Jize
786dc090-843b-435d-adbe-1d35e8fc5828
Ou, Jun-Yu
3fb703e3-b222-46d2-b4ee-75f296d9d64d
Mashanovich, Goran
c806e262-af80-4836-b96f-319425060051

Li, Peng, Yan, Jize, Ou, Jun-Yu and Mashanovich, Goran (2022) Tailorable stimulated Brillouin scattering in a partially suspended aluminium nitride waveguide in the visible range. Optics Express, 30 (15), 27092-27108. (doi:10.1364/OE.462356).

Record type: Article

Abstract

Stimulated Brillouin scattering (SBS) has been widely applied in narrow line-width laser, microwave filters, optical gyroscopes and other fields. However, most research is limited within near-infrared to mid-infrared range. This is due to the limited transparent window in most materials, such as silicon and germanium. Aluminium Nitride (AlN) is a novel III-V material with a wide transparent window from 200 nm and an appropriate refractive index to confine the light. In this paper, we first validate the full-vectorial formalism to calculate SBS gain based on the measured results from a silicon platform. Compared to previous researches, our model achieves higher accuracy in terms of frequency, Q factor as well as Brillouin gain coefficient without modifying the waveguide width. It also reveals the importance of matching rotation matrix and crystalline coordinate system. Then, we investigate the SBS in a partially suspended AlN waveguide at 450 nm based on the validated method. It shows a wide tunability in frequency from 16 GHz to 32 GHz for forward SBS and a range from 42 GHz to 49 GHz for backward SBS. We numerically obtain the value of Brillouin gain of 1311 W−1m−1 when Q factor is dominated by anchor loss for forward SBS of TE mode. We also find out that in the case for forward SBS of TM mode, anchor loss could be greatly suppressed when the node point of the selected acoustic mode matches with the position of pillar anchor. Our findings pave a new way to obtain Brillouin-related applications in integrated photonic circuit within the visible range.

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Accepted/In Press date: 25 May 2022
e-pub ahead of print date: 31 May 2022
Keywords: Brillouin scattering, Perfectly matched layer, aluminium nitride

Identifiers

Local EPrints ID: 457721
URI: http://eprints.soton.ac.uk/id/eprint/457721
ISSN: 1094-4087
PURE UUID: 1e7daf12-a710-42ae-8e44-598b72655d48
ORCID for Peng Li: ORCID iD orcid.org/0000-0003-1828-9597
ORCID for Jize Yan: ORCID iD orcid.org/0000-0002-2886-2847
ORCID for Jun-Yu Ou: ORCID iD orcid.org/0000-0001-8028-6130

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Date deposited: 16 Jun 2022 00:24
Last modified: 21 Sep 2022 01:53

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Contributors

Author: Peng Li ORCID iD
Author: Jize Yan ORCID iD
Author: Jun-Yu Ou ORCID iD

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