@article{9d414df80ae24c1a8ef0468e61a275e1,
title = "Exciting Pseudospin-Dependent Edge States in Plasmonic Metasurfaces",
abstract = "We study a plasmonic metasurface that supports pseudospin-dependent edge states confined at a subwavelength scale, considering full electrodynamic interactions including retardation and radiative effects. The spatial symmetry of the lattice of plasmonic nanoparticles gives rise to edge states with properties reminiscent of the quantum spin Hall effect in topological insulators. However, unlike the spin-momentum locking characteristic of topological insulators, these modes are not purely unidirectional and their propagation properties can be understood by analyzing the spin angular momentum of the electromagnetic field, which is inhomogeneous in the plane of the lattice. The local sign of the spin angular momentum determines the propagation direction of the mode under a near-field excitation source. We also study the optical response under far-field excitation and discuss in detail the effects of radiation and retardation.",
keywords = "edge states, metasurface, nanoparticle array, plasmonics, pseudospin, topological photonics",
author = "Matthew Proctor and Craster, \{Richard V.\} and Maier, \{Stefan A.\} and Vincenzo Giannini and Huidobro, \{Paloma A.\}",
note = "Funding Information: We acknowledge fruitful discussions with A. Garc{\'i}a-Etxarri and Mehul P. Makwana. M.P., R.V.C., and P.A.H. acknowledge funding from the Leverhulme Trust. V.G. acknowledges the Spanish Ministerio de Economia y Competitividad for financial support through the grant NANOTOPO (FIS2017-91413-EXP) and also the Ministerio de Ciencia, Innovaci{\'o}n y Universidades through the grant MELODIA (PGC2018-095777-B-C21). P.A.H. also acknowledges funding from Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia and Instituto de Telecomunica{\c c}{\~o}es under projects CEECIND/03866/2017 and UID/EEA/50008/2019. S.A.M. and R.V.C. acknowledge funding from EPSRC Programme Grant “Mathematical Fundamentals of Metamaterials” (EP/L024926/1). S.A.M. additionally acknowledges the Lee-Lucas Chair in Physics. We thank Jude Marcella for the TOC figure. Publisher Copyright: Copyright {\textcopyright} 2019 American Chemical Society.",
year = "2019",
month = nov,
day = "20",
doi = "10.1021/acsphotonics.9b01192",
language = "English",
volume = "6",
pages = "2985--2995",
journal = "ACS Photonics",
issn = "2330-4022",
publisher = "American Chemical Society",
number = "11",
}