Far-field nanoscale infrared spectroscopy of vibrational fingerprints of molecules with graphene plasmons
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2016-07-27
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en
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8
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Nature Communications, Volume 7, pp. 1-8
Abstract
Infrared spectroscopy, especially for molecular vibrations in the fingerprint region between 600 and 1,500 cm -1, is a powerful characterization method for bulk materials. However, molecular fingerprinting at the nanoscale level still remains a significant challenge, due to weak light-matter interaction between micron-wavelengthed infrared light and nano-sized molecules. Here we demonstrate molecular fingerprinting at the nanoscale level using our specially designed graphene plasmonic structure on CaF 2 nanofilm. This structure not only avoids the plasmon-phonon hybridization, but also provides in situ electrically-tunable graphene plasmon covering the entire molecular fingerprint region, which was previously unattainable. In addition, undisturbed and highly confined graphene plasmon offers simultaneous detection of in-plane and out-of-plane vibrational modes with ultrahigh detection sensitivity down to the sub-monolayer level, significantly pushing the current detection limit of far-field mid-infrared spectroscopies. Our results provide a platform, fulfilling the long-awaited expectation of high sensitivity and selectivity far-field fingerprint detection of nano-scale molecules for numerous applications.Description
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Hu, H, Yang, X, Zhai, F, Hu, D, Liu, R, Liu, K, Sun, Z & Dai, Q 2016, ' Far-field nanoscale infrared spectroscopy of vibrational fingerprints of molecules with graphene plasmons ', Nature Communications, vol. 7, 12334, pp. 1-8 . https://doi.org/10.1038/ncomms12334