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Spatially resolved pump-probe study of single-layer graphene produced by chemical vapor deposition [Invited]Brian A. Ruzicka, Shuai Wang, Jianwei Liu, Kian-Ping Loh, Judy Z. Wu, and Hui Zhao »View Author Affiliations
Brian A. Ruzicka,1
Shuai Wang,2
Jianwei Liu,1
Kian-Ping Loh,2
Judy Z. Wu,1
and Hui Zhao1,*
1Department of Physics and Astronomy, The University of Kansas, Lawrence, Kansas 66045, USA 2Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 1175436, Singapore *Corresponding author: huizhao@ku.edu |
Optical Materials Express, Vol. 2, Issue 6, pp. 708-716 (2012)
http://dx.doi.org/10.1364/OME.2.000708
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Abstract
Carrier dynamics in single-layer graphene grown by chemical vapor deposition (CVD) is studied using spatially and temporally resolved pump-probe spectroscopy by measuring both differential transmission and differential reflection. By studying the expansion of a Gaussian spatial profile of carriers excited by a 1500-nm pump pulse with a 1761-nm probe pulse, we observe a diffusion of hot carriers of 5500 cm2/s. We also observe that the expansion of the carrier density profile decreases to a slow rate within 1 ps, which is unexpected. Furthermore, by using an 810-nm probe pulse we observe that both the differential transmission and reflection change signs, but also that this sign change can be permanently removed by exposure of the graphene to femtosecond laser pulses of relatively high fluence. This indicates that the differential transmission and reflection at later times may not be directly caused by carriers, but may be from some residue material from the sample fabrication or transfer process.
© 2012 OSA
OCIS Codes
(190.4400) Nonlinear optics : Nonlinear optics, materials
(320.7120) Ultrafast optics : Ultrafast phenomena
ToC Category:
Nanomaterials
History
Original Manuscript: March 12, 2012
Revised Manuscript: April 21, 2012
Manuscript Accepted: April 24, 2012
Published: April 30, 2012
Virtual Issues
Nanocarbon for Photonics and Optoelectronics (2012) Optical Materials Express
Citation
Brian A. Ruzicka, Shuai Wang, Jianwei Liu, Kian-Ping Loh, Judy Z. Wu, and Hui Zhao, "Spatially resolved pump-probe study of single-layer graphene produced
by chemical vapor deposition [Invited]," Opt. Mater. Express 2, 708-716 (2012)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-2-6-708
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References
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- M. Currie, J. D. Caldwell, F. J. Bezares, J. Robinson, T. Anderson, H. Chun, and M. Tadjer, “Quantifying pulsed laser induced damage to graphene,” Appl. Phys. Lett.99, 211909 (2011). [CrossRef]
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- A. Roberts, D. Cormode, C. Reynolds, T. Newhouse-Illige, B. J. LeRoy, and A. S. Sandhu, “Response of graphene to femtosecond high-intensity laser irradiation,” Appl. Phys. Lett.99, 051912 (2011). [CrossRef]
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- L. Huang, G. V. Hartland, L. Q. Chu, Luxmi, R. M. Feenstra, C. Lian, K. Tahy, and H. Xing, “Ultrafast transient absorption microscopy studies of carrier dynamics in epitaxial graphene,” Nano Lett.10, 1308–1313 (2010). [CrossRef] [PubMed]
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- K. S. Kim, Y. Zhao, H. Jang, S. Y. Lee, J. M. Kim, K. S. Kim, J. H. Ahn, P. Kim, J. Y. Choi, and B. H. Hong, “Large-scale pattern growth of graphene films for stretchable transparent electrodes,” Nature457, 706–710 (2009). [CrossRef] [PubMed]
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ACS Nano
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Adv. Funct. Mater.
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Appl. Phys. Lett.
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Appl. Phys. Lett.
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Carbon
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J. Appl. Phys.
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J. Appl. Phys.
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J. Phys. Chem. C
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J. Phys. Chem. Lett.
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Nano Lett.
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Nano Lett.
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Nature
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Opt. Express
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Phys. Rev. B
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Phys. Rev. B
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Phys. Rev. B
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