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Direct determination of absorption anisotropy in colloidal quantum rods

Kamal John Sundar UGent, Raquel Filipa Gomes Pinto Fernandes UGent, Zeger Hens UGent, Masoumeh Karvar UGent, Kristiaan Neyts UGent, Sien Compernolle UGent and Frank Vanhaecke UGent (2012) PHYSICAL REVIEW B. 85(3).
abstract
We propose a direct method to determine absorption anisotropy of colloidal quantum rods. In this method, the rods are aligned in solution by using an alternating electric field and we measure simultaneously the resulting average change in absorption. We show that a frequency window for the electric field exists in which the change in absorbance as a function of field strength can be analyzed in terms of the quantum-rod dipole moment and the absorption coefficient for light that is polarized parallel or perpendicular to the long axis of the rod. The approach is verified by measuring the absorbance change of CdSe rods at 400 nm as a function of field strength, where we demonstrate excellent agreement between experiment and theory. This enables us to propose improved values for the CdSe quantum-rod extinction coefficient. Next, we analyze CdSe/CdS dot-in-rods and find that the absorption of the first exciton transition is fully anisotropic, with a vanishing absorption coefficient for light that is polarized perpendicularly to the long axis of the rods
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
NANOWIRES, GROWTH, DOTS, CDSE NANOCRYSTALS, SIZE, EXTINCTION COEFFICIENT, SEMICONDUCTOR NANOCRYSTALS, CROSS-SECTION, OPTICAL-PROPERTIES
journal title
PHYSICAL REVIEW B
Phys. Rev. B
volume
85
issue
3
article_number
035126
pages
7 pages
Web of Science type
Article
Web of Science id
000299872400004
JCR category
PHYSICS, CONDENSED MATTER
JCR impact factor
3.767 (2012)
JCR rank
15/68 (2012)
JCR quartile
1 (2012)
ISSN
1098-0121
DOI
10.1103/PhysRevB.85.035126
project
Center for nano- and biophotonics (NB-Photonics)
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2070396
handle
http://hdl.handle.net/1854/LU-2070396
date created
2012-03-20 15:31:45
date last changed
2014-05-26 09:48:58
@article{2070396,
  abstract     = {We propose a direct method to determine absorption anisotropy of colloidal quantum rods. In this method, the rods are aligned in solution by using an alternating electric field and we measure simultaneously the resulting average change in absorption. We show that a frequency window for the electric field exists in which the change in absorbance as a function of field strength can be analyzed in terms of the quantum-rod dipole moment and the absorption coefficient for light that is polarized parallel or perpendicular to the long axis of the rod. The approach is verified by measuring the absorbance change of CdSe rods at 400 nm as a function of field strength, where we demonstrate excellent agreement between experiment and theory. This enables us to propose improved values for the CdSe quantum-rod extinction coefficient. Next, we analyze CdSe/CdS dot-in-rods and find that the absorption of the first exciton transition is fully anisotropic, with a vanishing absorption coefficient for light that is polarized perpendicularly to the long axis of the rods},
  articleno    = {035126},
  author       = {John Sundar, Kamal and Gomes Pinto Fernandes, Raquel Filipa and Hens, Zeger and Karvar, Masoumeh and Neyts, Kristiaan and Compernolle, Sien and Vanhaecke, Frank},
  issn         = {1098-0121},
  journal      = {PHYSICAL REVIEW B},
  keyword      = {NANOWIRES,GROWTH,DOTS,CDSE NANOCRYSTALS,SIZE,EXTINCTION COEFFICIENT,SEMICONDUCTOR NANOCRYSTALS,CROSS-SECTION,OPTICAL-PROPERTIES},
  language     = {eng},
  number       = {3},
  pages        = {7},
  title        = {Direct determination of absorption anisotropy in colloidal quantum rods},
  url          = {http://dx.doi.org/10.1103/PhysRevB.85.035126},
  volume       = {85},
  year         = {2012},
}

Chicago
John Sundar, Kamal, Raquel Filipa Gomes Pinto Fernandes, Zeger Hens, Masoumeh Karvar, Kristiaan Neyts, Sien Compernolle, and Frank Vanhaecke. 2012. “Direct Determination of Absorption Anisotropy in Colloidal Quantum Rods.” Physical Review B 85 (3).
APA
John Sundar, K., Gomes Pinto Fernandes, R. F., Hens, Z., Karvar, M., Neyts, K., Compernolle, S., & Vanhaecke, F. (2012). Direct determination of absorption anisotropy in colloidal quantum rods. PHYSICAL REVIEW B, 85(3).
Vancouver
1.
John Sundar K, Gomes Pinto Fernandes RF, Hens Z, Karvar M, Neyts K, Compernolle S, et al. Direct determination of absorption anisotropy in colloidal quantum rods. PHYSICAL REVIEW B. 2012;85(3).
MLA
John Sundar, Kamal, Raquel Filipa Gomes Pinto Fernandes, Zeger Hens, et al. “Direct Determination of Absorption Anisotropy in Colloidal Quantum Rods.” PHYSICAL REVIEW B 85.3 (2012): n. pag. Print.