Plasmon Hybridization in Compressible Metal-Insulator-Metal Nanocavities: An Optical Approach for Sensing Deep Sub-Wavelength Deformation
- Carrara, Angelica
- Maccaferri, Nicolo
- Cerea, Andrea
- Bozzola, Angelo
- De Angelis, Francesco
- Proietti Zaccaria, Remo
- Toma, Andrea
DOIAbstract
A pressure-induced deformation-sensitive device (DSD) is presented based on 2D matrices of plasmonic gold nanodisks coupled to a metal thin layer through a compressible dielectric spacer, namely a deformable metal-insulator-metal (MIM) nanocavity, to report deep sub-wavelength size variations (<lambda/200). The system is characterized by two hybrid branches, which are resonant in the visible/near infrared spectral region. The fundamental mode, owing to the near-field interaction between the plasmonic nanostructures and the metal film, exhibits a remarkable sensitivity to the gap size, exceeding that of a planar "macroscopic" optical cavity and extending its operational domain to the sub-wavelength range, where excellent opportunities toward...
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