Directed Two-Photon Absorption in CdSe Nanoplatelets Revealed by k‑Space Spectroscopy
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Otros documentos de la autoría: Heckmann, Jan; Scott, Riccardo; Prudnikau, Anatol V.; Antanovich, Artsiom; Owschimikow, Nina; Artemyev, Mikhail V.; Climente, Juan I.; Woggon, Ulrike; Grosse, Nicolai B.; Achtstein, Alexander W.
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https://doi.org/10.1021/acs.nanolett.7b03052 |
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Título
Directed Two-Photon Absorption in CdSe Nanoplatelets Revealed by k‑Space SpectroscopyAutoría
Fecha de publicación
2017Editor
American Chemical SocietyISSN
1530-6984; 1530-6992Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
http://pubs.acs.org/doi/10.1021/acs.nanolett.7b03052Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
We show that two-photon absorption (TPA) is
highly anisotropic in CdSe nanoplatelets, thus promoting them
as a new class of directional two-photon absorbers with large
cross sections. Comparing two-dimensional ... [+]
We show that two-photon absorption (TPA) is
highly anisotropic in CdSe nanoplatelets, thus promoting them
as a new class of directional two-photon absorbers with large
cross sections. Comparing two-dimensional k-space spectroscopic
measurements of the one-photon and two-photon
excitation of an oriented monolayer of platelets, it is revealed
that TPA into the continuum is a directional phenomenon. This
is in contrast to one-photon absorption. The observed
directional TPA is shown to be related to fundamental band
anisotropies of zincblende CdSe and the ultrastrong anisotropic
confinement. We recover the internal transition dipole
distribution and find that this directionality arises from the intrinsic directionality of the underlying Bloch and envelope
functions of the states involved. We note that the photoemission from the CdSe platelets is highly anisotropic following either
one- or two-photon excitation. Given the directionality and high TPA cross-section of these platelets, they may, for example, find
employment as efficient logic AND elements in integrated photonic devices, or directional photon converters. [-]
Publicado en
Nano Lett. 2017, 17Derechos de acceso
http://rightsstatements.org/vocab/CNE/1.0/
info:eu-repo/semantics/restrictedAccess
info:eu-repo/semantics/restrictedAccess
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