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Article: Role of hot electron scattering in epsilon-near-zero optical nonlinearity

TitleRole of hot electron scattering in epsilon-near-zero optical nonlinearity
Authors
KeywordsElectron scattering
Epsilon-near-zero
Free electron optical nonlinearity
Intraband transition
Issue Date2020
PublisherDe Gruyter Open. The Journal's web site is located at http://www.degruyter.com/view/j/nanoph
Citation
Nanophotonics, 2020, v. 9 n. 14, p. 4287-4293 How to Cite?
AbstractThe physical origin of epsilon-near-zero (ENZ) optical nonlinearity lies in the hot-electron dynamics, in which electron scattering plays an important role. With the damping factor defined by hot electron scattering time, the Drude model could be extended to modeling ENZ optical nonlinearity completely. We proposed a statistical electron scattering model that takes into account the effect of electron distribution in a nonparabolic band and conducted the investigation on indium tin oxide (ITO) with femtosecond-pump continuum-probe experiment. We found that ionized impurity scattering and acoustic phonon scattering are the two major scattering mechanisms, of which the latter had been neglected before. They dominate at low-energy and high-energy electrons, respectively, and are weakened or boosted for high electron temperature, respectively. The electron energy-dependent scattering time contributed from multiple scattering mechanisms shows the electron density-dependent damping factor. The comprehensive understanding of electron scattering in ITO will help to develop a complete model of ENZ optical nonlinearity. © 2020 Heng Wang et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution 4.0 International License.
Persistent Identifierhttp://hdl.handle.net/10722/289470
ISSN
2020 Impact Factor: 8.449
2020 SCImago Journal Rankings: 2.717
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorWang, H-
dc.contributor.authorDu, K-
dc.contributor.authorLiu, R-
dc.contributor.authorDai, X-
dc.contributor.authorZhang, W-
dc.contributor.authorChua, SJ-
dc.contributor.authorMei, T-
dc.date.accessioned2020-10-22T08:13:08Z-
dc.date.available2020-10-22T08:13:08Z-
dc.date.issued2020-
dc.identifier.citationNanophotonics, 2020, v. 9 n. 14, p. 4287-4293-
dc.identifier.issn2192-8606-
dc.identifier.urihttp://hdl.handle.net/10722/289470-
dc.description.abstractThe physical origin of epsilon-near-zero (ENZ) optical nonlinearity lies in the hot-electron dynamics, in which electron scattering plays an important role. With the damping factor defined by hot electron scattering time, the Drude model could be extended to modeling ENZ optical nonlinearity completely. We proposed a statistical electron scattering model that takes into account the effect of electron distribution in a nonparabolic band and conducted the investigation on indium tin oxide (ITO) with femtosecond-pump continuum-probe experiment. We found that ionized impurity scattering and acoustic phonon scattering are the two major scattering mechanisms, of which the latter had been neglected before. They dominate at low-energy and high-energy electrons, respectively, and are weakened or boosted for high electron temperature, respectively. The electron energy-dependent scattering time contributed from multiple scattering mechanisms shows the electron density-dependent damping factor. The comprehensive understanding of electron scattering in ITO will help to develop a complete model of ENZ optical nonlinearity. © 2020 Heng Wang et al., published by De Gruyter. This work is licensed under the Creative Commons Attribution 4.0 International License.-
dc.languageeng-
dc.publisherDe Gruyter Open. The Journal's web site is located at http://www.degruyter.com/view/j/nanoph-
dc.relation.ispartofNanophotonics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.subjectElectron scattering-
dc.subjectEpsilon-near-zero-
dc.subjectFree electron optical nonlinearity-
dc.subjectIntraband transition-
dc.titleRole of hot electron scattering in epsilon-near-zero optical nonlinearity-
dc.typeArticle-
dc.identifier.emailLiu, R: ruibin@HKUCC-COM.hku.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1515/nanoph-2020-0266-
dc.identifier.scopuseid_2-s2.0-85089705838-
dc.identifier.hkuros315971-
dc.identifier.volume9-
dc.identifier.issue14-
dc.identifier.spage4287-
dc.identifier.epage4293-
dc.identifier.isiWOS:000570670500005-
dc.publisher.placeGermany-
dc.identifier.issnl2192-8614-

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