Plasmonic structures, driven by collective electron oscillations in metallic nanostructures, are vital in nanophotonics for manipulating light at the nanoscale. This study focuses on metal nanogaps of 20 nm fabricated via Photolithography and atomic layer deposition, exhibiting tunable transmission resonances across visible to near-infrared wavelengths. Raman spectroscopy of Poly (p-phenylene vinylene) (PPV) on these metal nanogaps reveals altered Raman linewidths without significant changes in Raman frequencies, elucidating the intricate interplay between plasmonics and molecular interactions. These findings are pivotal for advancing our understanding of plasmonic effects at the molecular level, offering insights for innovative optoelectronic device design and sensing applications.
Plasmonic gap governs much of the electromagnetic response of metamaterials. Meanwhile, nano and subnanometric gap control achieved by exceptional advancement of nanotechnology has paved the way for quantum plasmonics. However, practical applications have been hindered by difficulties of active nano-control over a broad spectral range. We report on mechanically nano-controllable plasmonic metamaterials fabricated on flexible substrate with a broad spectral response from the visible to the terahertz waves. By closing and opening the metallic nanogap via macroscopic control, we observed both classical and quantum plasmonic responses. Using our devices functioning between the two extreme regimes of classical gaps and full-contact mode, we achieve unprecedented performances of light modulation in a broad spectral range.
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