Abstract-Optimizing Broadband Terahertz Modulation with Hybrid Graphene/Metasurface Structures

Sufei Shi , Bo Zeng , Huiling Han , Xiaoping Hong, Hsin-Zon Tsai , Han Sae Jung , Alex Zettl ,Michael F. Crommie , and Feng Wang

Nano Lett., Just Accepted Manuscript

DOI: 10.1021/nl503670d

Publication Date (Web): December 5, 2014

Copyright © 2014 American Chemical Society

http://pubs.acs.org/doi/abs/10.1021/nl503670d

We demonstrate efficient terahertz (THz) modulation by coupling graphene strongly with a broadband THz metasurface device. This THz metasurface, made of periodic gold slit arrays, shows near unity broadband transmission that arises from coherent radiation of the enhanced local-field in the slits. Utilizing graphene as an active load with tunable conductivity, we can significantly modify the local-field enhancement and strongly modulate the THz wave transmission. This hybrid device also provides a new platform for possible nonlinear THz spectroscopy study of graphene