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.
© 2014 Optical Society of America
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