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Proceedings Paper

Plasmonic resonance absorption spectra in mid-infrared in an array of graphene nanoresonators
Author(s): Don C. Abeysinghe; Joshua Myers; Nima Nader Esfahani; Joshua R. Hendrickson; Justin W. Cleary; Dennis E. Walker; Kuei-Hsien Chen; Li-Chyong Chen; Shin Mou
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Paper Abstract

We experimentally demonstrated graphene plasmon resonant absorption in mid-IR by utilizing an array of graphene nanoribbon resonators on SiO2 substrate. By tuning resonator width we probed the graphene plasmons with λp ≤ λ0/100 and plasmon resonances as high as 0.240 eV (2100 cm-1) for 40 nm wide nanoresonators. Resonant absorption spectra revealed plasmon dispersion as well as plasmon damping due to the interaction of graphene plasmons with the surface polar phonons in SiO2 substrate and intrinsic graphene optical phonons. Graphene nanoribbons with varying widths enabled us to identify the damping mechanisms of graphene plasmons and much reduced damping was observed when the plasmon resonance frequencies were close to the substrate polar phonon frequencies. Then, by direct ebeam exposure of graphene nanoresonators, we effectively changed the carrier density and caused red-shift of the plasmon spectra. This work will provide insight into light-sensitive, frequency-tunable photodetectors based on graphene’s plasmonic excitations.

Paper Details

Date Published: 31 January 2014
PDF: 7 pages
Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 89932B (31 January 2014); doi: 10.1117/12.2045723
Show Author Affiliations
Don C. Abeysinghe, Air Force Research Lab. (United States)
Joshua Myers, Air Force Research Lab. (United States)
Nima Nader Esfahani, Air Force Research Lab. (United States)
Joshua R. Hendrickson, Air Force Research Lab. (United States)
Justin W. Cleary, Air Force Research Lab. (United States)
Dennis E. Walker, Air Force Research Lab. (United States)
Kuei-Hsien Chen, Academia Sinica (Taiwan)
Li-Chyong Chen, National Taiwan Univ. (Taiwan)
Shin Mou, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 8993:
Quantum Sensing and Nanophotonic Devices XI
Manijeh Razeghi; Eric Tournié; Gail J. Brown, Editor(s)

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