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Nanoelectromechanical modulation of a strongly-coupled plasmonic dimer.

ABSTRACT: The ability of two nearly-touching plasmonic nanoparticles to squeeze light into a nanometer gap has provided a myriad of fundamental insights into light-matter interaction. In this work, we construct a nanoelectromechanical system (NEMS) that capitalizes on the unique, singular behavior that arises at sub-nanometer particle-spacings to create an electro-optical modulator. Using in situ electron energy loss spectroscopy in a transmission electron microscope, we map the spectral and spatial changes in the plasmonic modes as they hybridize and evolve from a weak to a strong coupling regime. In the strongly-coupled regime, we observe a very large mechanical tunability (~250?meV/nm) of the bonding-dipole plasmon resonance of the dimer at ~1?nm gap spacing, right before detrimental quantum effects set in. We leverage our findings to realize a prototype NEMS light-intensity modulator operating at ~10?MHz and with a power consumption of only 4 fJ/bit.

SUBMITTER: Song JH

PROVIDER: S-EPMC7782521 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Nanoelectromechanical modulation of a strongly-coupled plasmonic dimer.

Song Jung-Hwan JH Raza Søren S van de Groep Jorik J Kang Ju-Hyung JH Li Qitong Q Kik Pieter G PG Brongersma Mark L ML

Nature communications 20210104 1

The ability of two nearly-touching plasmonic nanoparticles to squeeze light into a nanometer gap has provided a myriad of fundamental insights into light-matter interaction. In this work, we construct a nanoelectromechanical system (NEMS) that capitalizes on the unique, singular behavior that arises at sub-nanometer particle-spacings to create an electro-optical modulator. Using in situ electron energy loss spectroscopy in a transmission electron microscope, we map the spectral and spatial chang ...[more]

PMID: 33397929

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