Abstract-Tunable Terahertz Hybrid Metal-Graphene Plasmons

Mohammad Mehdi Jadidi, Andrei Sushkov, Rachael L. Myers-Ward, Anthony Boyd, Kevin Daniels, D Kurt Gaskill, Michael S Fuhrer, H. Dennis Drew and Thomas Edward Murphy

http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.5b03191

We report here a new type of plasmon resonance that occurs when graphene is connected to a metal. These new plasmon modes offer the potential to incorporate a tunable plasmonic channel into a device with electrical contacts, a critical step towards practical graphene terahertz optoelectronics. Through theory and experiments, we demonstrate, for example, anomalously high resonant absorption or transmission when subwavelength graphene-filled apertures are introduced into an otherwise conductive layer. These tunable plasmon resonances are essential yet missing ingredients needed for terahertz filters, oscillators, detectors, and modulators.

Abstract-Plasmon-enhanced Terahertz Photodetection in Graphene

Xinghan Cai , Andrei B. Sushkov , Mohammad M. Jadidi , Luke O Nyakiti , Rachael L. Myers-Ward , D Kurt Gaskill , Thomas E. Murphy , Michael S Fuhrer , and H. Dennis Drew

Nano Lett., Just Accepted Manuscript

DOI: 10.1021/acs.nanolett.5b00137

Publication Date (Web): April 14, 2015

Copyright © 2015 American Chemical Society

http://pubs.acs.org/doi/abs/10.1021/acs.nanolett.5b00137

We report a large area terahertz detector utilizing a tunable plasmonic resonance in sub-wavelength graphene micro-ribbons on SiC(0001) to increase the absorption efficiency. By tailoring the orientation of the graphene ribbons with respect to an array of sub-wavelength bimetallic electrodes, we achieve a condition in which the plasmonic mode can be efficiently excited by an incident wave polarized perpendicular to the electrode array, while the resulting photothermal voltage can be observed between the outermost electrodes.