DocumentCode
1769982
Title
Carrier dynamics in graphene studied by ultra-broadband THz time-domain spectroscopy
Author
Yamashita, Masaru ; Ikeda, Shoji ; Otani, C.
Author_Institution
RIKEN Center for Adv. Photonics, Sendai, Japan
fYear
2014
fDate
8-13 June 2014
Firstpage
1
Lastpage
2
Abstract
Carrier dynamics in a single-layered graphene has been studied by ultrabroadband terahertz time domain ellipsometric spectroscopy and time resolved optical pump THz probe technique. We successfully observed the frequency-dependent sheet conductivity of the optically-pumped graphene with and without the photo excitation. Above the optical fluence of 200 μJ/cm2, the negative conductivity indicating the possibility of THz wave amplification are realized.
Keywords
ellipsometry; graphene; optical conductivity; optical pumping; terahertz wave spectra; time resolved spectra; C; THz wave amplification; carrier dynamics; frequency-dependent sheet conductivity; optically-pumped graphene; photo excitation; single-layered graphene; time resolved optical pump THz probe; ultrabroadband terahertz time domain ellipsometric spectroscopy; Conductivity; Graphene; Optical pulses; Optical pumping; Optical reflection; Spectroscopy; Ultrafast optics;
fLanguage
English
Publisher
ieee
Conference_Titel
Lasers and Electro-Optics (CLEO), 2014 Conference on
Conference_Location
San Jose, CA
Type
conf
Filename
6988647
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