Friday, October 30, 2015

Abstract-Optical field terahertz amplitude modulation by graphene nanoribbons

Hong Zhang,*a   Yoshiyuki Miyamoto,b   Xinlu Chengc and  Angel Rubiodef  
Corresponding authors
College of Physical Science and Technology, Sichuan University, Chengdu 610065, China
Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Central 2, 1-1-1 Umezono, Tsukuba 305-8568, Japan
Key Laboratory of High Energy Density Physics and Technology of Ministry of Education; Sichuan University, Chengdu, China
Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
Nano-Bio Spectroscopy group, Universidad del País Vasco CFM CSIC-UPV/EHU-MPC DIPC, 20018 San Sebastian, Spain
European Theoretical Spectroscopy Facility (ETSF)
Nanoscale, 2015, Advance Article

DOI: 10.1039/C5NR05889A

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.

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