期刊
ACS PHOTONICS
卷 6, 期 11, 页码 2985-2995出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b01192
关键词
plasmonics; metasurface; nanoparticle array; topological photonics; edge states; pseudospin
类别
资金
- Leverhulme Trust
- Spanish Ministerio de Economia y Competitividad through the grant NANOTOPO [FIS2017-91413-EXP]
- Ministerio de Ciencia, Innovacion y Universidades through the grant MELODIA [PGC2018-095777-B-C21]
- Fundacao para a Ciencia e a Tecnologia and Instituto de Telecomunicacoes [CEECIND/03866/2017, UID/EEA/S0008/2019]
- EPSRC Programme Grant Mathematical Fundamentals of Metamaterials [EP/L024926/1]
- EPSRC [EP/L024926/1] Funding Source: UKRI
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.
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