Non-Reciprocal, Robust Surface Plasmon Polaritons on Gyrotropic Interfaces

Samanech Pakniyat (1) , Alexander Holmes (1) , George W. Hanson (2) , S. Ali Hassani Gangaraj (3) , Mauro Antezza (4, 5) , Mario Silveirinha (6) , Shahrokh Jam (7) , Francesco Monticone (8)

1 Department of Electrical Engineering & Computer Science - University of Wisconsin-Milwaukee
2 University of Wisconsin - Milwaukee
3 Columbia University [New York]
4 L2C - Laboratoire Charles Coulomb
5 Théorie du rayonnement matière et phénomènes quantiques
6 ULISBOA - Universidade de Lisboa = University of Lisbon
7 Shiraz University - Shiraz University
8 Cornell University [New York]

Unidirectional surface plasmon polaritons (SPPs) at the interface between a gyrotropic medium and a simple medium are studied in a newly recognized frequency regime wherein the SPPs form narrow, beam-like patterns due to quasi-hyperbolic dispersion. The SPP beams are steerable by controlling parameters such as the cyclotron frequency (external magnetic bias) or the frequency of operation. The bulk band structure along different propagation directions is examined to ascertain a common bulk bandgap, valid for all propagation directions, which the SPPs cross. In addition, group velocity and Poynting vector for the SPPs are presented. The case of a finite-thickness gyrotropic slab is also considered, for which we present the Green function and examine the thickness and loss level required to maintain a unidirectional SPP.

Domaines: Physique Quantique [quant-ph]; Gaz Quantiques [cond-mat.quant-gas]; Agrégats Moléculaires et Atomiques [physics.atm-clus]; Physique Atomique [physics.atom-ph]; Optique [physics.optics]

Samanech Pakniyat, Alexander Holmes, George W. Hanson, S. Ali Hassani Gangaraj, Mauro Antezza, et al.. Non-Reciprocal, Robust Surface Plasmon Polaritons on Gyrotropic Interfaces. IEEE Transactions on Antennas and Propagation, 2020, 65 (5), pp.3718. ⟨10.1109/TAP.2020.2969725⟩. ⟨hal-02566076⟩