Hybridization of Localized and Guided Modes in 2D Metal–Insulator–Metal Nanocavity Arrays

Abstract

This article describes the angle-dependent optical responses of 2D metal−insulator−metal (MIM) nanocavity arrays. Through a combination of soft nanolithography and template stripping, we fabricated arrays of plasmonic MIM nanostructures with subwavelength spacings over square centimeter areas. We controlled the coupling between the localized surface plasmon and guided modes as well as engineered the optical band structure by tuning the insulator thickness. Rabi splitting of hybridized modes strongly depended on the spatial overlap of the near-fields of the localized and guided modes.

Symmetry‐Broken Metamaterial Absorbers as Reflectionless Directional Couplers for Surface Plasmon Polaritons in the Visible Range

“…Such intersections on an ω -k dispersion diagram indicate the locations of enhanced interactions, due to the simultaneous satisfaction of the laws of conservation of momentum and energy at those points. As the asymmetry of the structure is increased (by decreasing D/P x further from 0.5), the interaction between the propagating mode and the localized mode of the shorter element begins to hybridize these modes into two new quasiparticles, [ 16,17 ] as clearly shown in Figure 3 c.…”

“…Simulated dispersion relations of this structure reveal the nature of the high-effi ciency coupling process: interactions between propagating modes caused by the broken refl ection symmetry (RS) and localized modes generated by individual MIM elements that are well understood in the language of MM "perfect absorbers". [ 14,15 ] There are regions in k -space where these interactions are very strong, such that the two modes hybridize to two new quasi-particles, [ 16,17 ] with concomitant Rabi splitting. [ 18,19 ] Experiments on samples with tuned parameters confi rm the simulated dispersion maps, and demonstrate a large Rabi splitting.…”

Plasmonic plano-semi-cylindrical nanocavities with high-efficiency local-field confinement

“…Localized surface plasmon resonance (LSPR) as a result of collective oscillation of free electrons in noble metals have been investigated extensively either in single nanostructures1234 or in hybrid systems like dimmers, oligomers, core-shells, particle-film systems, and etc 5678910111213141516171819202122232425262728…”

Strong coupling between localized and propagating plasmon polaritons

“…This goal has been sought either by metal nanoparticle-metal film [3][4][5][6][7][8][9][10][11] or metal nanoparticle-metal nanoparticle [12-15] configurations. Previously, metal nanoparticles placed nanometers away from continuous metal thin films resulting in a number of enhanced optical effects and tunable plasmon resonances have been proposed and experimentally demonstrated as plasmonic platforms to study coupling of localized SPPs (LSPP) and propagating SPPs (PSPPs) [3][4][5][6][7][8][9][10][11]. Until now, the plasmonplasmon (PP) coupling observed in this configuration has been mostly studied using isotropic Ag nanoparticles having plasmon resonance at ∼400 nm or isotropic gold nanoparticles having plasmon resonance at ∼530 nm.…”

“…Until now, the plasmonplasmon (PP) coupling observed in this configuration has been mostly studied using isotropic Ag nanoparticles having plasmon resonance at ∼400 nm or isotropic gold nanoparticles having plasmon resonance at ∼530 nm. In other cases, metal nanodisks and gratings have been used to study the PP coupling [9,10]. An optimum dielectric spacer layer thickness of around 10-30 nm was found to maximize PP coupling efficiency [3].…”