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20 August 2020 Plasmonic constructs that mix mid-infrared photonics to visible nanogap resonators
Angelos Xomalis, Xuezhi Zheng, Rohit Chikkaraddy, Jeremy J. Baumberg
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Proceedings Volume 11461, Active Photonic Platforms XII; 114612H (2020) https://doi.org/10.1117/12.2567900
Event: SPIE Nanoscience + Engineering, 2020, Online Only
Abstract
We show strong coupling of a mid-infrared microscale resonator with ultra-localised plasmonic nanocavity modes. This enables new types of mixing between IR absorption and surface-enhanced Raman scattering (SERS), opening up new types of ultrasensitive molecular detection. Nanoscale localized optical cavities are self-assembled by depositing Au nanoparticles onto few μm metal discs with molecular spacers. Coupling between the microscale resonator and nanocavity in this nanoparticle-on-resonator (NPoR) scheme, reveals extreme near-field enhancements resulting in boosted SERS intensities. We anticipate that such near-field enhancements open new horizons in single-molecule photonic circuits and molecular optomechanics.
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Angelos Xomalis, Xuezhi Zheng, Rohit Chikkaraddy, and Jeremy J. Baumberg "Plasmonic constructs that mix mid-infrared photonics to visible nanogap resonators", Proc. SPIE 11461, Active Photonic Platforms XII, 114612H (20 August 2020); https://doi.org/10.1117/12.2567900
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KEYWORDS
Resonators
Plasmonics
Mid-IR
Photonics
Nanoparticles
Near field
Absorption
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