A Single Chiral Nanoparticle Induced Valley Polarization Enhancement.

Kim, S; Lim, Y-C; Kim, RM; Fröch, JE; Tran, TN; Nam, KT; Aharonovich, I

A Single Chiral Nanoparticle Induced Valley Polarization Enhancement.

Kim, S

Lim, Y-C Kim, RM Fröch, JE Tran, TN Nam, KT Aharonovich, I

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Publisher:: WILEY-V C H VERLAG GMBH
Publication Type:: Journal Article
Citation:: Small (Weinheim an der Bergstrasse, Germany), 2020, 16, (37), pp. e2003005
Issue Date:: 2020-09

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Field	Value	Language
dc.contributor.author	Kim, S https://orcid.org/0000-0001-9836-3608
dc.contributor.author	Lim, Y-C
dc.contributor.author	Kim, RM
dc.contributor.author	Fröch, JE
dc.contributor.author	Tran, TN
dc.contributor.author	Nam, KT
dc.contributor.author	Aharonovich, I https://orcid.org/0000-0003-4304-3935
dc.date.accessioned	2020-10-20T20:23:37Z
dc.date.available	2020-10-20T20:23:37Z
dc.date.issued	2020-09
dc.identifier.citation	Small (Weinheim an der Bergstrasse, Germany), 2020, 16, (37), pp. e2003005
dc.identifier.issn	1613-6810
dc.identifier.issn	1613-6829
dc.identifier.uri	http://hdl.handle.net/10453/143416
dc.description.abstract	Valley polarization is among the most critical attributes of atomically thin materials. However, increasing contrast from monolayer transition metal dichalcogenides (TMDs) has so far been challenging. In this work, a large degree of circular polarization up to 45% from a monolayer WS2 is achieved at room temperature by using a single chiral plasmonic nanoparticle. The increased contrast is attributed to the selective enhancement of both the excitation and the emission rate having one particular handedness of the circular polarization, together with accelerated radiative recombination of valley excitons due to the Purcell effect. The experimental results are corroborated by the optical simulation using the finite-difference time-domain (FDTD) method. Additionally, the single chiral nanoparticle enables the observation of valley-polarized luminescence with a linear excitation. The results provide a promising pathway to enhance valley contrast from monolayer TMDs and utilize them for nanophotonic devices.
dc.format	Print-Electronic
dc.language	eng
dc.publisher	WILEY-V C H VERLAG GMBH
dc.relation	http://purl.org/au-research/grants/arc/DP180100077
dc.relation.ispartof	Small (Weinheim an der Bergstrasse, Germany)
dc.relation.isbasedon	10.1002/smll.202003005
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject.classification	Nanoscience & Nanotechnology
dc.title	A Single Chiral Nanoparticle Induced Valley Polarization Enhancement.
dc.type	Journal Article
utslib.citation.volume	16
utslib.location.activity	Germany
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
utslib.copyright.status	closed_access	*
dc.date.updated	2020-10-20T20:23:16Z
pubs.issue	37
pubs.publication-status	Published
pubs.volume	16
utslib.citation.issue	37

Abstract:

Valley polarization is among the most critical attributes of atomically thin materials. However, increasing contrast from monolayer transition metal dichalcogenides (TMDs) has so far been challenging. In this work, a large degree of circular polarization up to 45% from a monolayer WS2 is achieved at room temperature by using a single chiral plasmonic nanoparticle. The increased contrast is attributed to the selective enhancement of both the excitation and the emission rate having one particular handedness of the circular polarization, together with accelerated radiative recombination of valley excitons due to the Purcell effect. The experimental results are corroborated by the optical simulation using the finite-difference time-domain (FDTD) method. Additionally, the single chiral nanoparticle enables the observation of valley-polarized luminescence with a linear excitation. The results provide a promising pathway to enhance valley contrast from monolayer TMDs and utilize them for nanophotonic devices.

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http://hdl.handle.net/10453/143416