Influence of non-Kerr and nonlocal nonlinearities on instability gain spectrum in oppositely oriented coupler with negative refractive material channel.
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| Title: | Influence of non-Kerr and nonlocal nonlinearities on instability gain spectrum in oppositely oriented coupler with negative refractive material channel. |
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| Authors: | Rajamani, Emonisha1 (AUTHOR) emophysics1312@pondiuni.ac.in, Rajagopalan, Sivakumar1 (AUTHOR) rs4670@pondiuni.ac.in, Palani, Mohanraj2,3 (AUTHOR) mohanrajsphysics@gmail.com |
| Source: | Optical & Quantum Electronics. Jun2026, Vol. 58 Issue 6, p1-21. 21p. |
| Subjects: | Modulational instability, Negative refraction, Nonlinear theories, Ultrashort laser pulses, Optical couplers, Solitons |
| Abstract: | Modulation instability (MI) is a fundamental process that drives pattern formation and soliton generation in nonlinear optics. In this work, we investigate MI in oppositely oriented couplers with a negative-index channel, incorporating the combined effects of nonlocal and high-order non-Kerr nonlinearities (specifically, quintic, septic, and nonic). Using linear stability analysis, we derive the corresponding MI gain spectrum and show that, in the normal dispersion regime, a distinct base band instability emerges, producing non-zero gain even at zero modulation frequency, in contrast to the anomalous dispersion regime. Crucially, we demonstrate that the synergy between nonlocality and higher-order nonlinearities not only creates novel instability bands but also provides a powerful mechanism for the precise control of MI. These emergent bands are shown to facilitate the generation of soliton trains and ultrashort pulses. Furthermore, nonlocality is found to significantly enhance the MI gain spectrum under various normal dispersion and nonlinearity conditions. Our findings establish that tailored non-Kerr nonlocality can profoundly enhance nonlinear excitation in higher-order systems, paving the way for advanced applications in fiber lasers and supercontinuum generation. [ABSTRACT FROM AUTHOR] |
| Copyright of Optical & Quantum Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
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| Header | DbId: egs DbLabel: Engineering Source An: 194163120 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Influence of non-Kerr and nonlocal nonlinearities on instability gain spectrum in oppositely oriented coupler with negative refractive material channel. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Rajamani%2C+Emonisha%22">Rajamani, Emonisha</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> emophysics1312@pondiuni.ac.in</i><br /><searchLink fieldCode="AR" term="%22Rajagopalan%2C+Sivakumar%22">Rajagopalan, Sivakumar</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> rs4670@pondiuni.ac.in</i><br /><searchLink fieldCode="AR" term="%22Palani%2C+Mohanraj%22">Palani, Mohanraj</searchLink><relatesTo>2,3</relatesTo> (AUTHOR)<i> mohanrajsphysics@gmail.com</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Optical+%26+Quantum+Electronics%22">Optical & Quantum Electronics</searchLink>. Jun2026, Vol. 58 Issue 6, p1-21. 21p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Modulational+instability%22">Modulational instability</searchLink><br /><searchLink fieldCode="DE" term="%22Negative+refraction%22">Negative refraction</searchLink><br /><searchLink fieldCode="DE" term="%22Nonlinear+theories%22">Nonlinear theories</searchLink><br /><searchLink fieldCode="DE" term="%22Ultrashort+laser+pulses%22">Ultrashort laser pulses</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+couplers%22">Optical couplers</searchLink><br /><searchLink fieldCode="DE" term="%22Solitons%22">Solitons</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Modulation instability (MI) is a fundamental process that drives pattern formation and soliton generation in nonlinear optics. In this work, we investigate MI in oppositely oriented couplers with a negative-index channel, incorporating the combined effects of nonlocal and high-order non-Kerr nonlinearities (specifically, quintic, septic, and nonic). Using linear stability analysis, we derive the corresponding MI gain spectrum and show that, in the normal dispersion regime, a distinct base band instability emerges, producing non-zero gain even at zero modulation frequency, in contrast to the anomalous dispersion regime. Crucially, we demonstrate that the synergy between nonlocality and higher-order nonlinearities not only creates novel instability bands but also provides a powerful mechanism for the precise control of MI. These emergent bands are shown to facilitate the generation of soliton trains and ultrashort pulses. Furthermore, nonlocality is found to significantly enhance the MI gain spectrum under various normal dispersion and nonlinearity conditions. Our findings establish that tailored non-Kerr nonlocality can profoundly enhance nonlinear excitation in higher-order systems, paving the way for advanced applications in fiber lasers and supercontinuum generation. [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Optical & Quantum Electronics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s11082-026-08812-5 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 21 StartPage: 1 Subjects: – SubjectFull: Modulational instability Type: general – SubjectFull: Negative refraction Type: general – SubjectFull: Nonlinear theories Type: general – SubjectFull: Ultrashort laser pulses Type: general – SubjectFull: Optical couplers Type: general – SubjectFull: Solitons Type: general Titles: – TitleFull: Influence of non-Kerr and nonlocal nonlinearities on instability gain spectrum in oppositely oriented coupler with negative refractive material channel. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Rajamani, Emonisha – PersonEntity: Name: NameFull: Rajagopalan, Sivakumar – PersonEntity: Name: NameFull: Palani, Mohanraj IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 03068919 Numbering: – Type: volume Value: 58 – Type: issue Value: 6 Titles: – TitleFull: Optical & Quantum Electronics Type: main |
| ResultId | 1 |
