Journal
NANO LETTERS
Volume 13, Issue 8, Pages 3690-3697Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl401590g
Keywords
Optical phonon; polar dielectric; phonon polariton; silicon carbide; nanopillar; subdiffraction confinement; plasmonics; nanoantenna; mid-infrared
Categories
Funding
- NRL Nanoscience Institute
- ASEE-NRL Postdoctoral Fellowship Program
- EPSRC
- Leverhulme Trust
- Engineering and Physical Sciences Research Council [EP/D063329/1, EP/H000917/2, EP/H046887/1] Funding Source: researchfish
- EPSRC [EP/D063329/1, EP/H046887/1, EP/H000917/2] Funding Source: UKRI
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Plasmonics provides great promise for nanophotonic applications. However, the high optical losses inherent in metal-based plasmonic systems have limited progress. Thus, it is critical to identify alternative low-loss materials. One alternative is polar dielectrics that support surface phonon polariton SPhP) modes, where the confinement of infrared light is aided by optical phonons. Using fabricated 6H-silicon carbide nanopillar antenna arrays, we report on the observation of subdiffraction, localized SPhP resonances. They exhibit a dipolar resonance transverse to the nanopillar axis and a monopolar resonance associated with the longitudinal axis dependent upon the SiC substrate. Both exhibit exceptionally narrow linewidths (7-24 cm(-1)), with quality factors of 40-135, which exceed the theoretical limit of plasmonic systems, with extreme subwavelength confinement of (lambda(3)(res)/V-eff)(1/3) = 50-200. Under certain conditions, the modes are Raman-active, enabling their study in the visible spectral range. These observations promise to reinvigorate research in SPhP phenomena and their use for nanophotonic applications.
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