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Title:
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Gap soliton in a waveguide array with a saturating defocusing nonlinearity
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Author:
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Gaizzuskas, E; Savickas, A.; Staliunas, Kestutis
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Other authors:
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Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. DONLL - Dinàmica no Lineal, Òptica no Lineal i Làsers |
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Abstract:
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We investigate radiation of the solitary waves in the first band gap of the waveguide array with a defocusing nonlinearities of different types (Kerr nonlinearity and saturating nonlinearity). We confirm recent findings that gap solitons (GSs) are unstable for their eigenfrequencies around the middle of the band gap for Kerr nonlinearity. The instability is mediated by four-wave mixing process and appears in the form of radiation of solitons into mode continua of the upper and lower bands. We find that this soliton radiation is reduced (and even suppressed completely) in case of a saturating nonlinearity, resulting in substantial stabilization of the GSs. |
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Abstract:
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Peer Reviewed |
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Subject(s):
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-Àrees temàtiques de la UPC::Enginyeria de la telecomunicació::Telecomunicació òptica::Fotònica
-Àrees temàtiques de la UPC::Física::Física de l’estat sòlid::Cristalls
-Solitons
-Photonics
-Periodic structures
-Photonic crystal
-Supercontinuum
-Superlattices
-Radiation
-Lattices
-Fibers
-Media
-Cristalls fotònics
-Fotònica |
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Rights:
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Document type:
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Article - Published version
Article |
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