Higher-order topology in plasmonic kagome lattices
| Autor: | Aitzol García-Etxarri, María Blanco de Paz, Dario Bercioux, Paloma A. Huidobro, Matthew Proctor |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Physics Plasmonic nanoparticles Angular momentum Condensed Matter - Materials Science Physics and Astronomy (miscellaneous) Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Phase (waves) Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences Boundary (topology) Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Dipole Delocalized electron Mesoscale and Nanoscale Physics (cond-mat.mes-hall) 0103 physical sciences 0210 nano-technology Excitation Plasmon Optics (physics.optics) Physics - Optics |
| Popis: | We study the topological properties of a kagome plasmonic metasurface, modelled with a coupled dipole method which naturally includes retarded long range interactions. We demonstrate the system supports an obstructed atomic limit phase through the calculation of Wilson loops. Then we characterise the hierarchy of topological boundary modes hosted by the subwavelength array of plasmonic nanoparticles: both one-dimensional edge modes as well as zero-dimensional corner modes. We determine the properties of these modes which robustly confine light at subwavelength scales, calculate the local density of photonic states at edge and corner modes frequencies, and demonstrate the selective excitation of delocalised corner modes in a topological cavity, through non-zero orbital angular momentum beam excitation. main: 7 pages, 5 figures. supp: 9 pages, 7 figures |
| Databáze: | OpenAIRE |
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