Radiative Pumping and Propagation of Plexcitons in Diffractive Plasmonic Crystals

Abstract

Strong coupling between plasmons and excitons leads to the formation of plexcitons: quasiparticles that combine nanoscale energy confinement and pronounced optical nonlinearities. In addition to these localized modes, the enhanced control over the dispersion relation of propagating plexcitons may enable coherent and collective coupling of distant emitters. Here, we experimentally demonstrate strong coupling between carbon nanotube excitons and spatially extended plasmonic modes formed via diffractive coupling of periodically arranged gold nanoparticles (nanodisks, nanorods). Depending on the light-matter composition, the rather long-lived plexcitons (>100 fs) undergo highly directional propagation over 20 μm. Near-field energy distributions calculated with the finite-difference time-domain method fully corroborate our experimental results. The previously demonstrated compatibility of this plexcitonic system with electrical excitation opens the path to the realization of a variety of ultrafast active plasmonic devices, cavity-assisted energy transport and low-power optoelectronic components.

Light–Matter Interaction in Quantum Confined 2D Polar Metals

“…Coupling with different material systems and (quasi‐) particles therein, might result not only in field enhancement but in new quasiparticles such as chiral plasmons [ 76 ] and plexcitons. [ 77,78 ] Strong light matter interaction in the non‐linear [ 79 ] as well as linear regime with ENZ properties found for these 2D polar metals is expected to result in fascinating and unprecedented phenomena facilitated by the unique properties of the 2D metals and their expected high tunability and integrability in photonic, plasmonic, and optoelectronic circuitries for next generation photonics, quantum plasmonics, hot‐electron generation, photo‐catalysis, solar power harvesting, sensing, and nano‐particle trapping. [ 62–69 ]…”

Strong light–matter coupling and exciton-polariton condensation in lattices of plasmonic nanoparticles [Invited]

“…Carbon nanotubes are another class of materials used for hybridization with SLRs [94,98]. Apart from the strong binding energy of the excitons and small Stokes shift in carbon nanotubes, their remarkable charge transport properties have made them an interesting candidate for realizing electrically driven polariton devices at room temperature.…”

Collective Mie Exciton-Polaritons in an Atomically Thin Semiconductor

“…The results are different from previous studies of plasmonic nanoparticle arrays, in which linear and parabolic dispersion are selected by the different polarization due to the existence of only electric dipole resonances. [50][51][52] In addition, the sharp peak with a high quality factor (Q-factor) of 120 approximately, estimated by fitting it with a Lorentzian, displays a pronounced extinction as large as 0.92 at the energy of 2.0 eV. This peak corresponds to the so-called Mie-SLRs, emerging from the coherent radiative coupling between the Mie scatters enhanced by the in-plane diffracted orders, i.e., the RAs.…”