期刊
LIGHT-SCIENCE & APPLICATIONS
卷 7, 期 -, 页码 -出版社
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2017.172
关键词
boron nitride; phonon polaritons; strong coupling; surface-enhanced infrared absorption spectroscopy; SEIRA
类别
资金
- European Commission [696656]
- Marie Sklodowska-Curie individual fellowship [SGPCM-705960]
- Spanish Ministry of Economy and Competitiveness [MDM-2016-0618, FIS2014-60195-JIN, MAT2014-53432-C5-4-R, MAT2015-65525-R, MAT2015-65159-R, FIS2016-80174-P, MAT2017-88358-C3-3-R]
- Basque government [PRE-2016-1-0150, PRE-2016-2-0025]
- Department of Industry of the Basque Government (ELKARTEK project MICRO4FA)
- Regional Council of Gipuzkoa [100/16]
- ERC [715496]
- European Research Council (ERC) [715496] Funding Source: European Research Council (ERC)
Enhanced light-matter interactions are the basis of surface-enhanced infrared absorption (SEIRA) spectroscopy, and conventionally rely on plasmonic materials and their capability to focus light to nanoscale spot sizes. Phonon polariton nanoresonators made of polar crystals could represent an interesting alternative, since they exhibit large quality factors, which go far beyond those of their plasmonic counterparts. The recent emergence of van der Waals crystals enables the fabrication of high-quality nanophotonic resonators based on phonon polaritons, as reported for the prototypical infrared-phononic material hexagonal boron nitride (h-BN). In this work we use, for the first time, phonon-polariton-resonant h-BN ribbons for SEIRA spectroscopy of small amounts of organic molecules in Fourier transform infrared spectroscopy. Strikingly, the interaction between phonon polaritons and molecular vibrations reaches experimentally the onset of the strong coupling regime, while numerical simulations predict that vibrational strong coupling can be fully achieved. Phonon polariton nanoresonators thus could become a viable platform for sensing, local control of chemical reactivity and infrared quantum cavity optics experiments.
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