Low loss Si-rich silicon nitride for nonlinear signal processing applications
Low loss Si-rich silicon nitride for nonlinear signal processing applications
Nonlinear silicon photonic devices have attracted considerable attention thanks to their ability to show large third-order nonlinear effects at moderate power levels allowing for all-optical signal processing functionalities in miniaturized components. Although significant efforts have been made and many nonlinear optical functions have already been demonstrated in this platform, the performance of nonlinear silicon photonic devices remains fundamentally limited at the telecom wavelength region due to the two photon absorption (TPA) and related effects. In this work, we propose an alternative CMOS-compatible platform, based on silicon-rich silicon nitride that can overcome this limitation. By carefully selecting the material deposition parameters, we show that both of the device linear and nonlinear properties can be tuned in order to exhibit the desired behaviour at the selected wavelength region. A rigorous and systematic fabrication and characterization campaign of different material compositions is presented, enabling us to demonstrate TPA-free CMOS-compatible waveguides with low linear loss (~1.5 dB/cm) and enhanced Kerr nonlinear response (Re{γ} = 16 Wm-1). Thanks to these properties, our nonlinear waveguides are able to produce a π nonlinear phase shift, paving the way for the development of practical devices for future optical communication applications.
Lacava, Cosimo
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Stanković, Stevan
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Khokhar, Ali
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Domínguez Bucio, Thalia
83b57799-c566-473c-9b53-92e9c50b4287
Gardes, Frederic
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Reed, Graham
ca08dd60-c072-4d7d-b254-75714d570139
Richardson, David
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Petropoulos, Periklis
522b02cc-9f3f-468e-bca5-e9f58cc9cad7
4 August 2017
Lacava, Cosimo
a0a31a27-23ac-4a73-8bb4-2f02368fb8bd
Stanković, Stevan
13e8c464-b876-405a-b442-7c437a6eafd3
Khokhar, Ali
2eedd1cc-8ac5-4f8e-be25-930bd3eae396
Domínguez Bucio, Thalia
83b57799-c566-473c-9b53-92e9c50b4287
Gardes, Frederic
7a49fc6d-dade-4099-b016-c60737cb5bb2
Reed, Graham
ca08dd60-c072-4d7d-b254-75714d570139
Richardson, David
ebfe1ff9-d0c2-4e52-b7ae-c1b13bccdef3
Petropoulos, Periklis
522b02cc-9f3f-468e-bca5-e9f58cc9cad7
Lacava, Cosimo, Stanković, Stevan, Khokhar, Ali, Domínguez Bucio, Thalia, Gardes, Frederic, Reed, Graham, Richardson, David and Petropoulos, Periklis
(2017)
Low loss Si-rich silicon nitride for nonlinear signal processing applications.
Pacific Rim Conference on Lasers and Electro-Optics, Sands Expo and Convention Centre, Singapore.
31 Jul - 04 Aug 2017.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Nonlinear silicon photonic devices have attracted considerable attention thanks to their ability to show large third-order nonlinear effects at moderate power levels allowing for all-optical signal processing functionalities in miniaturized components. Although significant efforts have been made and many nonlinear optical functions have already been demonstrated in this platform, the performance of nonlinear silicon photonic devices remains fundamentally limited at the telecom wavelength region due to the two photon absorption (TPA) and related effects. In this work, we propose an alternative CMOS-compatible platform, based on silicon-rich silicon nitride that can overcome this limitation. By carefully selecting the material deposition parameters, we show that both of the device linear and nonlinear properties can be tuned in order to exhibit the desired behaviour at the selected wavelength region. A rigorous and systematic fabrication and characterization campaign of different material compositions is presented, enabling us to demonstrate TPA-free CMOS-compatible waveguides with low linear loss (~1.5 dB/cm) and enhanced Kerr nonlinear response (Re{γ} = 16 Wm-1). Thanks to these properties, our nonlinear waveguides are able to produce a π nonlinear phase shift, paving the way for the development of practical devices for future optical communication applications.
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Published date: 4 August 2017
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Invited paper
Venue - Dates:
Pacific Rim Conference on Lasers and Electro-Optics, Sands Expo and Convention Centre, Singapore, 2017-07-31 - 2017-08-04
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Local EPrints ID: 434323
URI: http://eprints.soton.ac.uk/id/eprint/434323
PURE UUID: 5d1ed380-637f-41a6-b9fb-bbeb92b35cf3
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Date deposited: 19 Sep 2019 16:30
Last modified: 09 Feb 2023 03:01
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