Nonlinear properties of laser-processed polycrystalline silicon waveguides for integrated photonics
Nonlinear properties of laser-processed polycrystalline silicon waveguides for integrated photonics
We report nonlinear optical characterization of cm-long polycrystalline silicon (polySi) waveguides at telecom wavelengths. Laser post-processing of lithographically-patterned amorphous silicon deposited on silica-on-silicon substrates provides low-loss poly-Si waveguides with surface-tension-shaped boundaries. Achieving optical losses as low as 4 dB cm
-1enabled us to demonstrate effects of self-phase modulation (SPM) and two-photon absorption (TPA). Analysis of the spectral broadening and nonlinear losses with numerical modeling reveals the best fit values of the Kerr coefficient n
2=4.5×10
-18m W
-1and TPA coefficient β
TPA=9.0×10
-12m
2W
-1, which are within the range reported for crystalline silicon. On-chip low-loss poly-Si paves the way for flexible integration of nonlinear components in multi-layered photonic systems.
polysilicon, Laser processing, optical waveguide, Photonics, Nonlinear Optics, self phase modulation, two photon absorption, Silicon photonics
29192-29201
Aktaş, Ozan
2e90db41-f409-431f-9827-2e2577a52457
MacFarquhar, Stuart James
cff30fb5-a4b6-44ab-b1b3-138e7020fba3
Oo, Swe
6495f6da-8f17-4484-98fb-6151b4efbd9a
Tarazona, Antulio
c6ae87c5-c746-4f89-9ff0-9e7b6874e94f
Chong, Harold
795aa67f-29e5-480f-b1bc-9bd5c0d558e1
Peacock, Anna
685d924c-ef6b-401b-a0bd-acf1f8e758fc
28 September 2020
Aktaş, Ozan
2e90db41-f409-431f-9827-2e2577a52457
MacFarquhar, Stuart James
cff30fb5-a4b6-44ab-b1b3-138e7020fba3
Oo, Swe
6495f6da-8f17-4484-98fb-6151b4efbd9a
Tarazona, Antulio
c6ae87c5-c746-4f89-9ff0-9e7b6874e94f
Chong, Harold
795aa67f-29e5-480f-b1bc-9bd5c0d558e1
Peacock, Anna
685d924c-ef6b-401b-a0bd-acf1f8e758fc
Aktaş, Ozan, MacFarquhar, Stuart James, Oo, Swe, Tarazona, Antulio, Chong, Harold and Peacock, Anna
(2020)
Nonlinear properties of laser-processed polycrystalline silicon waveguides for integrated photonics.
Optics Express, 28 (20), .
(doi:10.1364/OE.400536).
Abstract
We report nonlinear optical characterization of cm-long polycrystalline silicon (polySi) waveguides at telecom wavelengths. Laser post-processing of lithographically-patterned amorphous silicon deposited on silica-on-silicon substrates provides low-loss poly-Si waveguides with surface-tension-shaped boundaries. Achieving optical losses as low as 4 dB cm
-1enabled us to demonstrate effects of self-phase modulation (SPM) and two-photon absorption (TPA). Analysis of the spectral broadening and nonlinear losses with numerical modeling reveals the best fit values of the Kerr coefficient n
2=4.5×10
-18m W
-1and TPA coefficient β
TPA=9.0×10
-12m
2W
-1, which are within the range reported for crystalline silicon. On-chip low-loss poly-Si paves the way for flexible integration of nonlinear components in multi-layered photonic systems.
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Submitted date: 16 June 2020
Accepted/In Press date: 27 August 2020
Published date: 28 September 2020
Keywords:
polysilicon, Laser processing, optical waveguide, Photonics, Nonlinear Optics, self phase modulation, two photon absorption, Silicon photonics
Identifiers
Local EPrints ID: 443412
URI: http://eprints.soton.ac.uk/id/eprint/443412
ISSN: 1094-4087
PURE UUID: 73bc2a12-6d8f-410c-99a7-c39c38d9ab20
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Date deposited: 24 Aug 2020 16:35
Last modified: 06 Jun 2024 04:19
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