Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/94853
Title: Spatially resolved pump-probe study of single-layer graphene produced by chemical vapor deposition [Invited]
Authors: Ruzicka, B.A.
Wang, S. 
Liu, J.
Loh, K.P. 
Wu, J.Z.
Zhao, H.
Issue Date: 2012
Source: Ruzicka, B.A.,Wang, S.,Liu, J.,Loh, K.P.,Wu, J.Z.,Zhao, H. (2012). Spatially resolved pump-probe study of single-layer graphene produced by chemical vapor deposition [Invited]. Optical Materials Express 2 (6) : 708-716. ScholarBank@NUS Repository.
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 Optical Society of America.
Source Title: Optical Materials Express
URI: http://scholarbank.nus.edu.sg/handle/10635/94853
ISSN: 21593930
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

20
checked on Mar 10, 2018

Google ScholarTM

Check


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.