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Positive and negative pull-back instabilities in mode splitting optomechanical devices

Positive and negative pull-back instabilities in mode splitting optomechanical devices
Positive and negative pull-back instabilities in mode splitting optomechanical devices
Optical gradient forces play an essential role in optomechanical systems. The systems based on coupled microresonators are of great importance for applications in signal processing, sensors, and actuators. Here, we theoretically and experimentally studied, for the first time, positive and negative pull-back instabilities originating from attractive and repulsive optical gradient forces, respectively, in an optomechanical device based on coupled microrings. The device consists of two coupled free-standing waveguides in two identical microrings, fabricated in the silicon-on-insulator process. The coupling between the two microrings results in the symmetric and antisymmetric resonances showing in the transmission spectrum of the device. By measuring the wavelength difference between the self-referenced symmetric and antisymmetric resonances, the wavelength tuning due to the optomechanical actuation is decoupled from the tuning due to the thermo-optical effect. It is demonstrated theoretically and experimentally that the positive pull-back instability originates from the attractive optical gradient force and the negative pull-back instability originates from the repulsive optical gradient force when the pump wavelength increases. The positive pull-back instability significantly increases the wavelength difference between the symmetric and antisymmetric resonances. On the contrary, the negative pull-back instability significantly decreases the wavelength difference.
2330-4022
123 - 131
Pi, Hailong
e275259b-31f8-430c-89d5-0d029740d60e
Campanella, Carlo Edoardo
4a4c5998-775d-443e-b729-c42ed660c193
Thomson, David
17c1626c-2422-42c6-98e0-586ae220bcda
Yan, Jize
786dc090-843b-435d-adbe-1d35e8fc5828
Pi, Hailong
e275259b-31f8-430c-89d5-0d029740d60e
Campanella, Carlo Edoardo
4a4c5998-775d-443e-b729-c42ed660c193
Thomson, David
17c1626c-2422-42c6-98e0-586ae220bcda
Yan, Jize
786dc090-843b-435d-adbe-1d35e8fc5828

Pi, Hailong, Campanella, Carlo Edoardo, Thomson, David and Yan, Jize (2021) Positive and negative pull-back instabilities in mode splitting optomechanical devices. ACS Photonics, 9 (1), 123 - 131. (doi:10.1021/acsphotonics.1c01241).

Record type: Article

Abstract

Optical gradient forces play an essential role in optomechanical systems. The systems based on coupled microresonators are of great importance for applications in signal processing, sensors, and actuators. Here, we theoretically and experimentally studied, for the first time, positive and negative pull-back instabilities originating from attractive and repulsive optical gradient forces, respectively, in an optomechanical device based on coupled microrings. The device consists of two coupled free-standing waveguides in two identical microrings, fabricated in the silicon-on-insulator process. The coupling between the two microrings results in the symmetric and antisymmetric resonances showing in the transmission spectrum of the device. By measuring the wavelength difference between the self-referenced symmetric and antisymmetric resonances, the wavelength tuning due to the optomechanical actuation is decoupled from the tuning due to the thermo-optical effect. It is demonstrated theoretically and experimentally that the positive pull-back instability originates from the attractive optical gradient force and the negative pull-back instability originates from the repulsive optical gradient force when the pump wavelength increases. The positive pull-back instability significantly increases the wavelength difference between the symmetric and antisymmetric resonances. On the contrary, the negative pull-back instability significantly decreases the wavelength difference.

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Accepted/In Press date: 13 December 2021
e-pub ahead of print date: 29 December 2021

Identifiers

Local EPrints ID: 454847
URI: http://eprints.soton.ac.uk/id/eprint/454847
ISSN: 2330-4022
PURE UUID: 65fe7d4f-1aa3-4eb6-9547-95538bd14a4a
ORCID for Jize Yan: ORCID iD orcid.org/0000-0002-2886-2847

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Date deposited: 25 Feb 2022 17:33
Last modified: 26 Feb 2022 02:46

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Contributors

Author: Hailong Pi
Author: Carlo Edoardo Campanella
Author: David Thomson
Author: Jize Yan ORCID iD

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