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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.
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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.
Keywords
colloidal nanocrystals, intraband absorption, transient absorption spectroscopy, lead chalcogenide, tight-binding, free carrier absorption, optical signal processing, TRANSITIONS

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MLA
De Geyter, Bram, et al. “Broadband and Picosecond Intraband Absorption in Lead Based Colloidal Quantum Dots.” International Conference on Transparent Optical Networks-ICTON, IEEE, 2012, doi:10.1109/ICTON.2012.6254469.
APA
De Geyter, B., Geiregat, P., Gao, Y., ten Cate, S., Houtepen, A. J., Schins, J. M., … Hens, Z. (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), Coventry, UK. https://doi.org/10.1109/ICTON.2012.6254469
Chicago author-date
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. https://doi.org/10.1109/ICTON.2012.6254469.
Chicago author-date (all authors)
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. doi:10.1109/ICTON.2012.6254469.
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. In: International Conference on Transparent Optical Networks-ICTON. New York, NY, USA: IEEE; 2012.
IEEE
[1]
B. De Geyter et al., “Broadband and picosecond intraband absorption in lead based colloidal quantum dots,” in International Conference on Transparent Optical Networks-ICTON, Coventry, UK, 2012.
@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}},
  keywords     = {{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://doi.org/10.1109/ICTON.2012.6254469}},
  year         = {{2012}},
}
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