Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprints
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 wavelengt...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2020-05-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2020-0164 |
| _version_ | 1818444227924721664 |
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| author | Voronin Kirill V. Aseguinolaza Aguirreche Unai Hillenbrand Rainer Volkov Valentyn S. Alonso-González Pablo Nikitin Alexey Y. |
| author_facet | Voronin Kirill V. Aseguinolaza Aguirreche Unai Hillenbrand Rainer Volkov Valentyn S. Alonso-González Pablo Nikitin Alexey Y. |
| author_sort | Voronin Kirill V. |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-12-14T19:12:35Z |
| format | Article |
| id | doaj.art-725f87c5fa65433f9314ec627d6021d4 |
| institution | Directory Open Access Journal |
| issn | 2192-8606 2192-8614 |
| language | English |
| last_indexed | 2024-12-14T19:12:35Z |
| publishDate | 2020-05-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-725f87c5fa65433f9314ec627d6021d42022-12-21T22:50:42ZengDe GruyterNanophotonics2192-86062192-86142020-05-01972089209510.1515/nanoph-2020-0164Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprintsVoronin Kirill V.0Aseguinolaza Aguirreche Unai1Hillenbrand Rainer2Volkov Valentyn S.3Alonso-González Pablo4Nikitin Alexey Y.5Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudny, 141700, RussiaCentro de Fìsica de Materiales CFM, CSIC-UPV/EHU, Donostia-San Sebastian, 20018, SpainCIC nanoGUNE BRTA and Department of Electricity and Electronics, UPV/EHU, Donostia-San Sebastian, 20018, SpainCenter for Photonics and 2D Materials, Moscow Institute of Physics and Technology, Dolgoprudny, 141700, RussiaDepartment of Physics, University of Oviedo, Oviedo, 33006, SpainDonostia International Physics Center (DIPC), Donostia-San Sebastian, 20018, SpainMid-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.https://doi.org/10.1515/nanoph-2020-0164graphene plasmonmolecular sensingnanofocusing |
| spellingShingle | Voronin Kirill V. Aseguinolaza Aguirreche Unai Hillenbrand Rainer Volkov Valentyn S. Alonso-González Pablo Nikitin Alexey Y. Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprints Nanophotonics graphene plasmon molecular sensing nanofocusing |
| title | Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprints |
| title_full | Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprints |
| title_fullStr | Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprints |
| title_full_unstemmed | Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprints |
| title_short | Nanofocusing of acoustic graphene plasmon polaritons for enhancing mid-infrared molecular fingerprints |
| title_sort | nanofocusing of acoustic graphene plasmon polaritons for enhancing mid infrared molecular fingerprints |
| topic | graphene plasmon molecular sensing nanofocusing |
| url | https://doi.org/10.1515/nanoph-2020-0164 |
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