Waveguide-Plasmon Polaritons: Strong Coupling of Photonic and Electronic Resonances in a Metallic Photonic Crystal Slab

Abstract

Strong coupling between localized particle plasmons and optical waveguide modes leads to drastic modifications of the transmission of metallic nanowire arrays on dielectric waveguide substrates. The coupling results in the formation of a new quasiparticle, a waveguide-plasmon polariton, with a surprisingly large Rabi splitting of 250 meV. Our experimental results agree well with scattering-matrix calculations and a polariton-type model. The effect provides an efficient tool for photonic band gap engineering in metallodielectric photonic crystal slabs. We show evidence of a full one-dimensional photonic band gap in resonant plasmon-waveguide structures.

Nonreciprocal plasmonics enables giant enhancement of thin-film Faraday rotation

“…1. ) Besides the plasmon resonance, the nanowires introduce periodicity to the hybrid structure and hence enable light to couple into the magneto-optical thin film, which acts as a planar photonic crystal waveguide for photons 20,21 . The localized plasmon resonance and the waveguide resonance interact strongly, and this interaction can be tailored to engineer the magneto-optical properties.…”

“…Compared with Faraday rotation of the bare BIG film, À 0.17°, there is 1.9 times enhancement. The resonant shape of the Faraday rotation spectra and transmittance spectra is directly related to the waveguide-plasmon polaritons 20,21 . Cross-coupling of the TM and TE modes accounts for the enhancement of Faraday rotation.…”

“…If an oscillator is excited in one direction, the oscillation is transferred to the other oscillator via the elastic spring, and thus causes reradiation of waves in the orthogonal direction. In the magneto-plasmonic photonic crystal, TMpolarized incident light induces a TM waveguide-plasmon hybrid mode, with the electric field in the BIG film oscillating in the plane perpendicular to the wires and the magnetic field oscillating along the wires 20 . In the presence of static magnetization, the permittivity of BIG can be described by a tensor 23 e where g in the off-diagonal elements describes the magnetizationinduced gyration of the material.…”

“…It is achieved by incorporating nonreciprocal magneto-optical material with plasmonic photonic crystal [19][20][21] . Specifically, we fabricate plasmonic nanowire arrays on magneto-optical thin films and characterize the Faraday rotation by polarimetry.…”

Active Liquid Crystal Tuning of Metallic Nanoantenna Enhanced Light Emission from Colloidal Quantum Dots

“…Such coupling occurs, for example, in periodic arrays of metallic nanostructures. LSPRs in individual nanoantennas can couple to diffracted 31−33 or guided modes, 34,35 resulting in hybrid plasmonic−photonic modes. The dispersion, line width, and field confinement of these hybrid modes can be designed via the geometry and dimensions of the structures.…”