Metal-Dielectric-Metal Nanocavities with Vanishing Permittivity: Resonance Coupling and Strong Light-Matter Interaction

Layered Metal-Dielectric-Metal nanocavities sustain resonances with vanishing permittivity. The wavelength of these Epsilon-Near-Zero (ENZ) modes can be tuned straightforwardly by the thickness of the dielectric layer. Multiple ENZ resonances can be engineered by including higher frequency harmonics, and by stacks of strongly interacting cavities. Integrating such cavity systems with light emitting nanomaterials enables light emission enhancement, directional control, and strong light-matter interaction.