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- Title
Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprints.
- Authors
Voronin, Kirill V.; Aseguinolaza Aguirreche, Unai; Hillenbrand, Rainer; Volkov, Valentyn S.; Alonso-González, Pablo; Nikitin, Alexey Y.
- Abstract
Mid-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.
- Subjects
POLARITONS; ELECTROMAGNETIC fields; METALLIC surfaces; CHARGE carriers; OPTICAL spectroscopy; MAGNETIC coupling; INFRARED absorption
- Publication
Nanophotonics (21928606), 2020, Vol 9, Issue 7, p2089
- ISSN
2192-8606
- Publication type
Article
- DOI
10.1515/nanoph-2020-0164