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Perfect Extinction of Terahertz Waves in Monolayer Graphene over 2-nm-Wide Metallic Apertures

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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 effi ciency 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 fi lm. By resonantly coupling THz waves through annular nanogaps, the extremely localized fi elds 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.

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Informasi Detail

Judul Seri

Adv. Optical Mater.

No. Panggil

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Penerbit

: WILEY-VCH Verlag GmbH & Co. KGaA., 2015

Deskripsi Fisik

Adv. Optical Mater. 2015, 3, 667–673

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

FISIKA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Wati/Agus

Versi lain/terkait

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