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Chirality dependence of the absorption cross-section of carbon nanotubes.

By Fabien Vialla, Cyrielle Roquelet, Benjamin Langlois, Géraud Delport, Sylvia Santos, Emmanuelle Deleporte, Philippe Roussignol, Claude Delalande, Christophe Voisin and Jean-Sébastien Lauret

Abstract

International audienceThe variation of the optical absorption of carbon nanotubes with their geometry has been a long standing question at the heart of both metrological and applicative issues, in particular because optical spectroscopy is one of the primary tools for the assessment of the chiral species abundance of samples. Here, we tackle the chirality dependence of the optical absorption with an original method involving ultra-efficient energy transfer in porphyrin/nanotube compounds that allows uniform photo-excitation of all chiral species. We measure the absolute absorption cross-section of a wide range of semiconducting nanotubes at their S22 transition and show that it varies by up to a factor of 2.2 with the chiral angle, with type I nanotubes showing a larger absorption. In contrast, the luminescence quantum yield remains almost constant

Topics: [ PHYS.COND.CM-GEN ] Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other]
Publisher: American Physical Society
Year: 2013
OAI identifier: oai:HAL:hal-00869868v1
Provided by: Hal-Diderot

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