Designing plasmonic eigenstates for optical signal transmission and logic gates nanodevices

Two dimensional colloidal plasmonic cavities spatially and spectrally shape the near-field. By designing these two degrees of freedom, transduction function can be implemented in single cavities that perform Boolean logic... [ view full abstract ]

Two dimensional colloidal plasmonic cavities spatially and spectrally shape the near-field. By designing these two degrees of freedom, transduction function can be implemented in single cavities that perform Boolean logic functions. The wealth of available plasmonic modes allow to implement complex logic functions without the need of concatenating building blocks but rather by redesigning the transfer function.

Indeed, 2D plasmonic systems with mesoscopic sizes sustain higher order plasmonic modes and combine the properties of surface plasmon polaritons (SPP) and localized surface plasmon (LSP). Such multimodal plasmonic systems open a new realm in which the modal behavior is better described by the Surface Plasmon local density of states (SP-LDOS), which is solely governed by the material properties and the boundary conditions set by the structure shape, but is independent of the illumination parameters. SP-LDOS can be rationally designed to tailor the local spatial and spectral characteristics of the SP modes, while allowing information transfer over micrometer-sized distances.

The next level of information processing consists in performing Boolean logic from the incoming signal. Here again, the tailoring of the modal properties of confined plasmonic cavities can be exploited to designing reconfigurable universal logic gates that can be converted into one another, this opens the way to the integration of complex functions at the nanoscale.

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