Nanoscale-confined terahertz polaritons in a van der Waals crystal

de Oliveira, Thales V.A.G.; Nörenberg, Tobias; Álvarez-Pérez, Gonzalo; Wehmeier, Lukas; Taboada-Gutiérrez, Javier; Obst, Maximilian; Hempel, Franz; Lee, Eduardo Jian Hua; Klopf, J. Michael; Errea, Ion; Nikitin, Alexey Y.; Kehr, Susanne C.; Alonso-González, Pablo; Eng, Lukas M.

Nanoscale-confined terahertz polaritons in a van der Waals crystal

Electromagnetic field confinement is crucial for nanophotonic technologies, since it allows for enhancing light–matter interactions, thus enabling light manipulation in deep sub-wavelength scales. In the terahertz (THz) spectral range, radiation confinement is conventionally achieved with specially...

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Autores:	de Oliveira, Thales V.A.G., Nörenberg, Tobias, Álvarez-Pérez, Gonzalo, Wehmeier, Lukas, Taboada-Gutiérrez, Javier, Obst, Maximilian, Hempel, Franz, Lee, Eduardo Jian Hua, Klopf, J. Michael, Errea, Ion, Nikitin, Alexey Y., Kehr, Susanne C., Alonso-González, Pablo, Eng, Lukas M.
Tipo de recurso:	artículo
Fecha de publicación:	2020
País:	España
Institución:	Universidad Autónoma de Madrid
Repositorio:	Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:	inglés
OAI Identifier:	oai:repositorio.uam.es:10486/704255
Acceso en línea:	http://hdl.handle.net/10486/704255 https://dx.doi.org/10.1002/adma.202005777
Access Level:	acceso abierto
Palabra clave:	Confined Phonons Diffraction Limits Experimental Demonstrations Hyperbolic Dispersion Metallic Structures Phonon Polaritons Terahertz Spectral Range THz Frequencies Física

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spelling	Nanoscale-confined terahertz polaritons in a van der Waals crystalde Oliveira, Thales V.A.G.Nörenberg, TobiasÁlvarez-Pérez, GonzaloWehmeier, LukasTaboada-Gutiérrez, JavierObst, MaximilianHempel, FranzLee, Eduardo Jian HuaKlopf, J. MichaelErrea, IonNikitin, Alexey Y.Kehr, Susanne C.Alonso-González, PabloEng, Lukas M.Confined PhononsDiffraction LimitsExperimental DemonstrationsHyperbolic DispersionMetallic StructuresPhonon PolaritonsTerahertz Spectral RangeTHz FrequenciesFísicaElectromagnetic field confinement is crucial for nanophotonic technologies, since it allows for enhancing light–matter interactions, thus enabling light manipulation in deep sub-wavelength scales. In the terahertz (THz) spectral range, radiation confinement is conventionally achieved with specially designed metallic structures—such as antennas or nanoslits—with large footprints due to the rather long wavelengths of THz radiation. In this context, phonon polaritons—light coupled to lattice vibrations—in van der Waals (vdW) crystals have emerged as a promising solution for controlling light beyond the diffraction limit, as they feature extreme field confinements and low optical losses. However, experimental demonstration of nanoscale-confined phonon polaritons at THz frequencies has so far remained elusive. Here, it is provided by employing scattering-type scanning near-field optical microscopy combined with a free-electron laser to reveal a range of low-loss polaritonic excitations at frequencies from 8 to 12 THz in the vdW semiconductor α-MoO3. In this study, THz polaritons are visualized with: i) in-plane hyperbolic dispersion, ii) extreme nanoscale field confinement (below λo ⁄75), and iii) long polariton lifetimes, with a lower limit of >2 psWileyDepartamento de Física de la Materia CondensadaFacultad de Ciencias20202020-12-03research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/704255https://dx.doi.org/10.1002/adma.202005777reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengEuropean Commission http://dx.doi.org/10.13039/501100000780 Horizon 2020 Framework Programme 715496open accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/7042552026-06-23T12:46:27Z
dc.title.none.fl_str_mv	Nanoscale-confined terahertz polaritons in a van der Waals crystal
title	Nanoscale-confined terahertz polaritons in a van der Waals crystal
spellingShingle	Nanoscale-confined terahertz polaritons in a van der Waals crystal de Oliveira, Thales V.A.G. Confined Phonons Diffraction Limits Experimental Demonstrations Hyperbolic Dispersion Metallic Structures Phonon Polaritons Terahertz Spectral Range THz Frequencies Física
title_short	Nanoscale-confined terahertz polaritons in a van der Waals crystal
title_full	Nanoscale-confined terahertz polaritons in a van der Waals crystal
title_fullStr	Nanoscale-confined terahertz polaritons in a van der Waals crystal
title_full_unstemmed	Nanoscale-confined terahertz polaritons in a van der Waals crystal
title_sort	Nanoscale-confined terahertz polaritons in a van der Waals crystal
dc.creator.none.fl_str_mv	de Oliveira, Thales V.A.G. Nörenberg, Tobias Álvarez-Pérez, Gonzalo Wehmeier, Lukas Taboada-Gutiérrez, Javier Obst, Maximilian Hempel, Franz Lee, Eduardo Jian Hua Klopf, J. Michael Errea, Ion Nikitin, Alexey Y. Kehr, Susanne C. Alonso-González, Pablo Eng, Lukas M.
author	de Oliveira, Thales V.A.G.
author_facet	de Oliveira, Thales V.A.G. Nörenberg, Tobias Álvarez-Pérez, Gonzalo Wehmeier, Lukas Taboada-Gutiérrez, Javier Obst, Maximilian Hempel, Franz Lee, Eduardo Jian Hua Klopf, J. Michael Errea, Ion Nikitin, Alexey Y. Kehr, Susanne C. Alonso-González, Pablo Eng, Lukas M.
author_role	author
author2	Nörenberg, Tobias Álvarez-Pérez, Gonzalo Wehmeier, Lukas Taboada-Gutiérrez, Javier Obst, Maximilian Hempel, Franz Lee, Eduardo Jian Hua Klopf, J. Michael Errea, Ion Nikitin, Alexey Y. Kehr, Susanne C. Alonso-González, Pablo Eng, Lukas M.
author2_role	author author author author author author author author author author author author author
dc.contributor.none.fl_str_mv	Departamento de Física de la Materia Condensada Facultad de Ciencias
dc.subject.none.fl_str_mv	Confined Phonons Diffraction Limits Experimental Demonstrations Hyperbolic Dispersion Metallic Structures Phonon Polaritons Terahertz Spectral Range THz Frequencies Física
topic	Confined Phonons Diffraction Limits Experimental Demonstrations Hyperbolic Dispersion Metallic Structures Phonon Polaritons Terahertz Spectral Range THz Frequencies Física
description	Electromagnetic field confinement is crucial for nanophotonic technologies, since it allows for enhancing light–matter interactions, thus enabling light manipulation in deep sub-wavelength scales. In the terahertz (THz) spectral range, radiation confinement is conventionally achieved with specially designed metallic structures—such as antennas or nanoslits—with large footprints due to the rather long wavelengths of THz radiation. In this context, phonon polaritons—light coupled to lattice vibrations—in van der Waals (vdW) crystals have emerged as a promising solution for controlling light beyond the diffraction limit, as they feature extreme field confinements and low optical losses. However, experimental demonstration of nanoscale-confined phonon polaritons at THz frequencies has so far remained elusive. Here, it is provided by employing scattering-type scanning near-field optical microscopy combined with a free-electron laser to reveal a range of low-loss polaritonic excitations at frequencies from 8 to 12 THz in the vdW semiconductor α-MoO3. In this study, THz polaritons are visualized with: i) in-plane hyperbolic dispersion, ii) extreme nanoscale field confinement (below λo ⁄75), and iii) long polariton lifetimes, with a lower limit of >2 ps
publishDate	2020
dc.date.none.fl_str_mv	2020 2020-12-03
dc.type.none.fl_str_mv	research article http://purl.org/coar/resource_type/c_2df8fbb1 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv	info:eu-repo/semantics/article
format	article
dc.identifier.none.fl_str_mv	http://hdl.handle.net/10486/704255 https://dx.doi.org/10.1002/adma.202005777
url	http://hdl.handle.net/10486/704255 https://dx.doi.org/10.1002/adma.202005777
dc.language.none.fl_str_mv	Inglés eng
language_invalid_str_mv	Inglés
language	eng
dc.relation.none.fl_str_mv	European Commission http://dx.doi.org/10.13039/501100000780 Horizon 2020 Framework Programme 715496
dc.rights.none.fl_str_mv	open access http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv	info:eu-repo/semantics/openAccess
rights_invalid_str_mv	open access http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv	openAccess
dc.format.none.fl_str_mv	application/pdf
dc.publisher.none.fl_str_mv	Wiley
publisher.none.fl_str_mv	Wiley
dc.source.none.fl_str_mv	reponame:Biblos-e Archivo. Repositorio Institucional de la UAM instname:Universidad Autónoma de Madrid
instname_str	Universidad Autónoma de Madrid
reponame_str	Biblos-e Archivo. Repositorio Institucional de la UAM
collection	Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score	15,301603

Nanoscale-confined terahertz polaritons in a van der Waals crystal

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