Skip to content
Skip to navigation menu

Physics Seminar

Topological nanophotonics

Speaker: Dr Paloma Arroyo Huidobro (Instituto de TelecomunicaƧƵes Lisbon)
Date: Wednesday 17 June 2020
Time: 11:00
Venue: Zoom

In this talk I will discuss how topological nanophotonics offers a promising path towards the precise control of photons at the nanoscale [1] by exploiting topologically protected boundary modes that are robust against a range of defects and imperfections.

I will first present a plasmonic realisation of the SSH model which hosts protected boundary modes localized at the ends of a 1D bipartite chain [2]. As a particularity of nanophotonics, this system exhibits a breakdown of bulk-boundary correspondence due to its inherent non-Hermiticity [3]. Next, I will consider a photonic analogue of the quantum spin Hall effect [4] in order to design 2D plasmonic metasurfaces hosting directional pseudo-spin modes propagating along the one-dimensional edges of different topological phases [5]. I will study how the directionality of these subwavelength-confined light modes depends on the position of the excitation source. Finally, I will introduce the higher order topology of the same system, where the topological character of the 2D lattice yields 0D corner modes when a closed boundary is considered [6].

[1] Rider, Palmer, Pocock, Xiao, Huidobro, Giannini, Journal of Applied Physics 125 (12), 120901 (2019)
[2] Pocock, Xiao, Huidobro, Giannini, ACS Photonics 5 (6), 2271-2279 (2018)
[3] Pocock, Huidobro, and Giannini, Nanophotonics 8(8) 1337 (2019)
[4] Wu and Hu, Phys. Rev. Lett.114, 223901(2015)
[5] Proctor, Craster, Maier, Giannini, and Huidobro, ACS Photonics 6 (11), 2985-2995 (2019)
[6] Proctor, Huidobro, Bradlyn, Blanco de Paz, Vergniory, Bercioux, and Garcia-Etxarri, to be submitted (2020)