@article{Park:2015:10.1002/adom.201400546,
author = {Park, H-R and Namgung, S and Chen, X and Lindquist, NC and Giannini, V and Francescato, Y and Maier, SA and Oh, S-H},
doi = {10.1002/adom.201400546},
journal = {Advanced Optical Materials},
title = {Perfect Extinction of Terahertz Waves in Monolayer Graphene over 2-nm-Wide Metallic Apertures},
url = {http://dx.doi.org/10.1002/adom.201400546},
year = {2015}
}

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TY  - JOUR
AB  - High carrier mobility and tunability in graphene enable fundamental studies for plasmonics and various applications. Despite its versatility, however, single-layer graphene (SLG) suffers from poor coupling efficiency to electromagnetic waves, presenting a major challenge for photonic applications. Compared with visible or infrared radiation, terahertz (THz) waves exhibit higher absorption in SLG due to Drude-like intraband transitions, but the wavelength-to-SLG size mismatch becomes even more dramatic. Here, we experimentally demonstrate 99% extinction of THz wave transmission when SLG covers the openings of 2-nm-wide (≈λ/1 000 000) slits through a metal film. By resonantly coupling THz waves through annular nanogaps, the extremely localized fields lead to near-perfect extinction and strong absorption in SLG. Atomic-layer lithography is used to produce these nanometer-wide, millimeter-long gaps over an entire 4-in. wafer. Furthermore, by integrating these devices with an ionic liquid, enhanced intraband absorption in the SLG leads to 80% modulation of THz waves with an operational voltage as low as 1.5 V.
AU  - Park,H-R
AU  - Namgung,S
AU  - Chen,X
AU  - Lindquist,NC
AU  - Giannini,V
AU  - Francescato,Y
AU  - Maier,SA
AU  - Oh,S-H
DO  - 10.1002/adom.201400546
PY  - 2015///
SN  - 2195-1071
TI  - Perfect Extinction of Terahertz Waves in Monolayer Graphene over 2-nm-Wide Metallic Apertures
T2  - Advanced Optical Materials
UR  - http://dx.doi.org/10.1002/adom.201400546
UR  - http://hdl.handle.net/10044/1/21133
ER  - 

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