title: Optical field terahertz amplitude modulation by graphene nanoribbons.
abstract: In this study, first-principles time-dependent density functional theory calculations were used to demonstrate the possibility to modulate the amplitude of the optical electric field (E-field) near a semiconducting graphene nanoribbon. A significant enhancement of the optical E-field was observed 3.34 Å above the graphene nanoribbon sheet, with an amplitude modulation of approximately 100 fs, which corresponds to a frequency of 10 THz. In general, a six-fold E-field enhancement could be obtained, which means that the power of the obtained THz is about 36 times that of incident UV light. We suggest the use of semiconducting graphene nanoribbons for converting visible and UV light into a THz signal.
authors.affiliation: College of Physical Science and Technology, Sichuan University, Chengdu 610065, China. hongzhang@scu.edu.cn.
authors.forename: Hong
authors.initials: H
authors.lastname: Zhang
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Miyamoto
authors.forename: Xinlu
authors.initials: X
authors.lastname: Cheng
authors.forename: Angel
authors.initials: A
authors.lastname: Rubio