Abstract
Abstract Photonic topological insulators (PTIs) are electromagnetic structures with highly robust unidirectional edge states, originating from their nontrivial bulk band topology. Here, we propose a plasmonic PTI that supports highly confined one-way edge states capable of transporting deep subwavelength optical frequency plasmons through arbitrary paths without back-scattering. The structure consists of a simple planar array of coupled plasmonic nanoparticles arranged in a perturbed honeycomb lattice that exhibits nontrivial band topology. The operation frequency of the emergent edge states is shown to be independent of the lattice constant, allowing for the miniaturization of the structure. As a high-frequency PTI with a simple and planar design, this structure is compatible with well-established integrated nanofabrication technologies and may find application in planar, compact, and topologically robust integrated nanophotonic devices.
Highlights
Photonic topological insulators (PTI) are a class of photonic structures that bring the exciting properties of electronic topological insulators in solid-state electronic systems to photonics and optics [1,2,3,4,5,6,7,8]
Since their first introduction in a two-dimensional (2D) time-reversal-symmetry (T-symmetry) broken magnetic photonic crystal [6], various photonic structures with nontrivial band topology have been proposed, including arrays of coupled ring resonators [4], bi-anisotropic metamaterials [7], and conventional photonic crystals [8]. These proposals are limited to either bulky dielectric waveguide structures or 3D anisotropic complex metamaterials with operation frequencies limited to the microwave regime, restricting their application in integrated and optical frequency nanophotonic devices, where effective routing of light can be challenging [10,11,12]. We address this challenge by using plasmonic structures in the form of a coupled metallic nanoparticle array
We proposed a plasmonic PTI based on a discrete array of plasmonic nanoparticles
Summary
Photonic topological insulators (PTI) are a class of photonic structures that bring the exciting properties of electronic topological insulators in solid-state electronic systems to photonics and optics [1,2,3,4,5,6,7,8]. To investigate the effect of the lattice constant on the band gap frequency, the transmission spectra in arrays of shrunken metamolecules with various lattice constants are numerically calculated In this calculation, the coupled dipole method is used to analyze a 30 × 30 array of meta-molecules, in which the source dipole and destination nanosphere are 20 unit cells apart, and transmission is defined as the ratio of their dipole moments |Pd/Ps |.
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