Plasmonic resonance absorption spectra in mid-infrared in an array of graphene nanoresonators

Don C. Abeysinghe; Joshua Myers; Nima Nader Esfahani; Joshua R. Hendrickson; Justin W. Cleary; Dennis E. Walker Jr.; Kuei-Hsien Chen; Li-Chyong Chen; Shin Mou

doi:10.1117/12.2045723

31 January 2014 Plasmonic resonance absorption spectra in mid-infrared in an array of graphene nanoresonators

Don C. Abeysinghe, Joshua Myers, Nima Nader Esfahani, Joshua R. Hendrickson, Justin W. Cleary, Dennis E. Walker Jr., Kuei-Hsien Chen, Li-Chyong Chen, Shin Mou

Author Affiliations +

Proceedings Volume 8993, Quantum Sensing and Nanophotonic Devices XI; 89932B (2014) https://doi.org/10.1117/12.2045723
Event: SPIE OPTO, 2014, San Francisco, California, United States

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 λ_p ≤ 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.

Citation Download Citation

Don C. Abeysinghe, Joshua Myers, Nima Nader Esfahani, Joshua R. Hendrickson, Justin W. Cleary, Dennis E. Walker Jr., Kuei-Hsien Chen, Li-Chyong Chen, and Shin Mou "Plasmonic resonance absorption spectra in mid-infrared in an array of graphene nanoresonators", Proc. SPIE 8993, Quantum Sensing and Nanophotonic Devices XI, 89932B (31 January 2014); https://doi.org/10.1117/12.2045723

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