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• W2093845385 abstract "Graphene’s optical properties in the infrared and terahertz can be tailored and enhanced by patterning graphene into periodic metamaterials with sub-wavelength feature sizes. Here we demonstrate polarization-sensitive and gate-tunable photodetection in graphene nanoribbon arrays. The long-lived hybrid plasmon–phonon modes utilized are coupled excitations of electron density oscillations and substrate (SiO2) surface polar phonons. Their excitation by s-polarization leads to an in-resonance photocurrent, an order of magnitude larger than the photocurrent observed for p-polarization, which excites electron–hole pairs. The plasmonic detectors exhibit photo-induced temperature increases up to four times as large as comparable two-dimensional graphene detectors. Moreover, the photocurrent sign becomes polarization sensitive in the narrowest nanoribbon arrays owing to differences in decay channels for photoexcited hybrid plasmon–phonons and electrons. Our work provides a path to light-sensitive and frequency-selective photodetectors based on graphene’s plasmonic excitations. By patterning graphene with sub-wavelength features to introduce plasmonic modes, its optical properties can be tailored. Freitag et al. show how tunable plasmons in graphene nanoribbons can be exploited to form polarization-sensitive graphene photodetectors in the mid-infrared spectral region." @default.
• W2093845385 created "2016-06-24" @default.
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• W2093845385 date "2013-06-03" @default.
• W2093845385 modified "2023-10-06" @default.
• W2093845385 title "Photocurrent in graphene harnessed by tunable intrinsic plasmons" @default.
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• W2093845385 doi "https://doi.org/10.1038/ncomms2951" @default.
• W2093845385 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23727714" @default.
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