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Broadband and picosecond intraband absorption in lead based colloidal quantum dots

Bram De Geyter UGent, Pieter Geiregat UGent, Yunan Gao, Sybren ten Cate, Arjan J Houtepen, Juleon M Schins, Dries Van Thourhout UGent, Laurens DA Siebbeles and Zeger Hens UGent (2012) International Conference on Transparent Optical Networks-ICTON.
abstract
Using femtosecond transient absorption spectroscopy we demonstrate that lead chalcogenide nanocrystals show efficient, photoinduced absorption (PA) in a broad wavelength range starting just below the bandgap. The time-dependent decay of the PA signal correlates well with the recovery of the band gap absorption. Therefore, the same carriers are involved, which decay with the typical Auger recombination rate in these nanocrystals. Based on this, we assign this PA signal to intraband absorption, i.e., the excitation of photo-generated carriers from the bottom of the conduction band or the top of the valence band to higher energy levels in the conduction and valence band continuum. This broadband response in the commercially interesting near to mid-infrared range is very relevant for ultra-high speed all optical signal processing.
Please use this url to cite or link to this publication:
author
organization
year
type
conference
publication status
published
subject
keyword
colloidal nanocrystals, intraband absorption, transient absorption spectroscopy, lead chalcogenide, tight-binding, free carrier absorption, optical signal processing, TRANSITIONS
in
International Conference on Transparent Optical Networks-ICTON
issue title
2012 14th International conference on transparent optical networks (ICTON 2012)
pages
4 pages
publisher
IEEE
place of publication
New York, NY, USA
conference name
14th International conference on Transparant Optical Networks (ICTON 2012)
conference location
Coventry, UK
conference start
2012-07-01
conference end
2012-07-05
Web of Science type
Proceedings Paper
Web of Science id
000335346900342
ISSN
2162-7339
ISBN
9781467322287
9781467322270
DOI
10.1109/ICTON.2012.6254469
project
Center for nano- and biophotonics (NB-Photonics)
language
English
UGent publication?
yes
classification
P1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2996024
handle
http://hdl.handle.net/1854/LU-2996024
date created
2012-09-20 09:24:02
date last changed
2014-08-28 13:05:30
@inproceedings{2996024,
  abstract     = {Using femtosecond transient absorption spectroscopy we demonstrate that lead chalcogenide nanocrystals show efficient, photoinduced absorption (PA) in a broad wavelength range starting just below the bandgap. The time-dependent decay of the PA signal correlates well with the recovery of the band gap absorption. Therefore, the same carriers are involved, which decay with the typical Auger recombination rate in these nanocrystals. Based on this, we assign this PA signal to intraband absorption, i.e., the excitation of photo-generated carriers from the bottom of the conduction band or the top of the valence band to higher energy levels in the conduction and valence band continuum. This broadband response in the commercially interesting near to mid-infrared range is very relevant for ultra-high speed all optical signal processing.},
  author       = {De Geyter, Bram and Geiregat, Pieter and Gao, Yunan and ten Cate, Sybren and Houtepen, Arjan J and Schins, Juleon M and Van Thourhout, Dries and Siebbeles, Laurens DA and Hens, Zeger},
  booktitle    = {International Conference on Transparent Optical Networks-ICTON},
  isbn         = {9781467322287},
  issn         = {2162-7339},
  keyword      = {colloidal nanocrystals,intraband absorption,transient absorption spectroscopy,lead chalcogenide,tight-binding,free carrier absorption,optical signal processing,TRANSITIONS},
  language     = {eng},
  location     = {Coventry, UK},
  pages        = {4},
  publisher    = {IEEE},
  title        = {Broadband and picosecond intraband absorption in lead based colloidal quantum dots},
  url          = {http://dx.doi.org/10.1109/ICTON.2012.6254469},
  year         = {2012},
}

Chicago
De Geyter, Bram, Pieter Geiregat, Yunan Gao, Sybren ten Cate, Arjan J Houtepen, Juleon M Schins, Dries Van Thourhout, Laurens DA Siebbeles, and Zeger Hens. 2012. “Broadband and Picosecond Intraband Absorption in Lead Based Colloidal Quantum Dots.” In International Conference on Transparent Optical Networks-ICTON. New York, NY, USA: IEEE.
APA
De Geyter, B., Geiregat, P., Gao, Y., ten Cate, S., Houtepen, A. J., Schins, J. M., Van Thourhout, D., et al. (2012). Broadband and picosecond intraband absorption in lead based colloidal quantum dots. International Conference on Transparent Optical Networks-ICTON. Presented at the 14th International conference on Transparant Optical Networks (ICTON 2012), New York, NY, USA: IEEE.
Vancouver
1.
De Geyter B, Geiregat P, Gao Y, ten Cate S, Houtepen AJ, Schins JM, et al. Broadband and picosecond intraband absorption in lead based colloidal quantum dots. International Conference on Transparent Optical Networks-ICTON. New York, NY, USA: IEEE; 2012.
MLA
De Geyter, Bram, Pieter Geiregat, Yunan Gao, et al. “Broadband and Picosecond Intraband Absorption in Lead Based Colloidal Quantum Dots.” International Conference on Transparent Optical Networks-ICTON. New York, NY, USA: IEEE, 2012. Print.