A metal-insulator-metal (MIM) structure is a fundamental plasmonic structure that has been studied widely since the
early stage of plasmonics. It enables us to confine surface plasmon polariton (SPP) and concentrate light into nano-space
beyond the diffraction limit. A finite-length MIM structure is considered to be a Fabry-Perot resonator of SPP as a
nanocavity. Here, we review our recent studies about active metasurface based on a reconfigurable metal-air-metal
(MAM) nanocavity which modify reflection or absorption spectra in scattering by changing a gap distance. Such
reconfigurable MAM nanocavity becomes promising candidate for various applications such as plasmonic color or sky
radiator from visible to infrared range.
Long-range surface plasmon polariton (LRSP) with lower attenuation and longer propagation length than conventional
surface plasmon polariton (SPP) on a single interface has been studied as new elements for integrated optical circuits.
LRSP exhibits on a metal film bounded by dielectric and can be expected to edge closer to practical use due to the long
propagation length. It is theoretically predicted that the propagation length of LRSP greatly increases as the lateral width
of a metal film decreases. Such mode propagating in a metal slab waveguide with extremely long propagation length is
named “super LRSP”. Here, we fabricate silver slab waveguide and observe the tendency of propagation properties of
super LRSP.
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