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Title

Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprints

AuthorsVoronin, Kirill V.; Aseginolaza, Unai; Hillenbrand, Rainer; Volkov, Valentyn S.; Alonso-González, Pablo CSIC ORCID ; Nikitin, Alexey Y.
KeywordsGraphene plasmon
Molecular sensing
Nanofocusing
Issue Date2020
PublisherWalter de Gruyter
CitationNanophotonics 9(7): 2089–2095 (2020)
AbstractMid-infrared (mid-IR) optical spectroscopy of molecules is of large interest in physics, chemistry, and biology. However, probing nanometric volumes of molecules is challenging because of the strong mismatch of their mid-infrared absorption and scattering cross-sections with the free-space wavelength. We suggest overcoming this difficulty by nanofocusing acoustic graphene plasmon polaritons (AGPs) – oscillations of Dirac charge carriers coupled to electromagnetic fields with extremely small wavelengths – using a taper formed by a graphene sheet above a metallic surface. We demonstrate that due to the appreciable field enhancement and mode volume reduction, the nanofocused AGPs can efficiently sense molecular fingerprints in nanometric volumes. We illustrate a possible realistic sensing sсenario based on AGP interferometry performed with a near-field microscope. Our results can open new avenues for designing tiny sensors based on graphene and other 2D polaritonic materials.
Publisher version (URL)https://doi.org/10.1515/nanoph-2020-0164
URIhttp://hdl.handle.net/10261/218510
DOI10.1515/nanoph-2020-0164
ISSN2192-8606
E-ISSN2192-8614
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