Directed Two-Photon Absorption in CdSe Nanoplatelets Revealed by k‑Space Spectroscopy
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https://doi.org/10.1021/acs.nanolett.7b03052 |
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Títol
Directed Two-Photon Absorption in CdSe Nanoplatelets Revealed by k‑Space SpectroscopyAutoria
Data de publicació
2017Editor
American Chemical SocietyISSN
1530-6984; 1530-6992Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.acs.org/doi/10.1021/acs.nanolett.7b03052Versió
info:eu-repo/semantics/publishedVersionParaules clau / Matèries
Resum
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. [-]
Publicat a
Nano Lett. 2017, 17Drets d'accés
http://rightsstatements.org/vocab/CNE/1.0/
info:eu-repo/semantics/restrictedAccess
info:eu-repo/semantics/restrictedAccess
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