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Article: Selectively Plasmon-Enhanced Second-Harmonic Generation from Monolayer Tungsten Diselenide on Flexible Substrates

TitleSelectively Plasmon-Enhanced Second-Harmonic Generation from Monolayer Tungsten Diselenide on Flexible Substrates
Authors
Keywordsgap plasmon
two-dimensional materials
second-harmonic generation
transition-metal dichalcogenides
sub-20 nm nanostructures
tungsten diselenide (WSe ) 2
Issue Date2018
Citation
ACS Nano, 2018, v. 12, n. 2, p. 1859-1867 How to Cite?
AbstractMonolayer two-dimensional transition-metal dichalcogenides (2D TMDCs) exhibit promising characteristics in miniaturized nonlinear optical frequency converters, due to their inversion asymmetry and large second-order nonlinear susceptibility. However, these materials usually have very short light interaction lengths with the pump laser because they are atomically thin, such that second-harmonic generation (SHG) is generally inefficient. In this paper, we fabricate a judiciously structured 150 nm-thick planar surface consisting of monolayer tungsten diselenide and sub-20 nm-wide gold trenches on flexible substrates, reporting ∼7000-fold SHG enhancement without peak broadening or background in the spectra as compared to WSe on as-grown sapphire substrates. Our proof-of-concept experiment yields effective second-order nonlinear susceptibility of 2.1 × 10 pm/V. Three orders of magnitude enhancement is maintained with pump wavelength ranging from 800 to 900 nm, breaking the limitation of narrow pump wavelength range for cavity-enhanced SHG. In addition, SHG amplitude can be dynamically controlled via selective excitation of the lateral gap plasmon by rotating the laser polarization. Such a fully open, flat, and ultrathin profile enables a great variety of functional samples with high SHG from one patterned silicon substrate, favoring scalable production of nonlinear converters. The surface accessibility also enables integration with other optical components for information processing in an ultrathin and flexible form. 2 4
Persistent Identifierhttp://hdl.handle.net/10722/298255
ISSN
2020 Impact Factor: 15.881
2020 SCImago Journal Rankings: 5.554

 

DC FieldValueLanguage
dc.contributor.authorWang, Zhuo-
dc.contributor.authorDong, Zhaogang-
dc.contributor.authorZhu, Hai-
dc.contributor.authorJin, Lei-
dc.contributor.authorChiu, Ming Hui-
dc.contributor.authorLi, Lain Jong-
dc.contributor.authorXu, Qing Hua-
dc.contributor.authorEda, Goki-
dc.contributor.authorMaier, Stefan A.-
dc.contributor.authorWee, Andrew T.S.-
dc.contributor.authorQiu, Cheng Wei-
dc.contributor.authorYang, Joel K.W.-
dc.date.accessioned2021-04-08T03:08:01Z-
dc.date.available2021-04-08T03:08:01Z-
dc.date.issued2018-
dc.identifier.citationACS Nano, 2018, v. 12, n. 2, p. 1859-1867-
dc.identifier.issn1936-0851-
dc.identifier.urihttp://hdl.handle.net/10722/298255-
dc.description.abstractMonolayer two-dimensional transition-metal dichalcogenides (2D TMDCs) exhibit promising characteristics in miniaturized nonlinear optical frequency converters, due to their inversion asymmetry and large second-order nonlinear susceptibility. However, these materials usually have very short light interaction lengths with the pump laser because they are atomically thin, such that second-harmonic generation (SHG) is generally inefficient. In this paper, we fabricate a judiciously structured 150 nm-thick planar surface consisting of monolayer tungsten diselenide and sub-20 nm-wide gold trenches on flexible substrates, reporting ∼7000-fold SHG enhancement without peak broadening or background in the spectra as compared to WSe on as-grown sapphire substrates. Our proof-of-concept experiment yields effective second-order nonlinear susceptibility of 2.1 × 10 pm/V. Three orders of magnitude enhancement is maintained with pump wavelength ranging from 800 to 900 nm, breaking the limitation of narrow pump wavelength range for cavity-enhanced SHG. In addition, SHG amplitude can be dynamically controlled via selective excitation of the lateral gap plasmon by rotating the laser polarization. Such a fully open, flat, and ultrathin profile enables a great variety of functional samples with high SHG from one patterned silicon substrate, favoring scalable production of nonlinear converters. The surface accessibility also enables integration with other optical components for information processing in an ultrathin and flexible form. 2 4-
dc.languageeng-
dc.relation.ispartofACS Nano-
dc.subjectgap plasmon-
dc.subjecttwo-dimensional materials-
dc.subjectsecond-harmonic generation-
dc.subjecttransition-metal dichalcogenides-
dc.subjectsub-20 nm nanostructures-
dc.subjecttungsten diselenide (WSe ) 2-
dc.titleSelectively Plasmon-Enhanced Second-Harmonic Generation from Monolayer Tungsten Diselenide on Flexible Substrates-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/acsnano.7b08682-
dc.identifier.pmid29301073-
dc.identifier.scopuseid_2-s2.0-85042679860-
dc.identifier.volume12-
dc.identifier.issue2-
dc.identifier.spage1859-
dc.identifier.epage1867-
dc.identifier.eissn1936-086X-
dc.identifier.issnl1936-0851-

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