doi:10.1021/acsphotonics.8b00062engLee, In-HoMartin-Moreno, LuisMohr, Daniel A.Khaliji, KavehLow, TonyOh, Sang-HyunAnisotropic acoustic plasmons in black phosphorusART-2018-107156Acoustic plasmon modes tightly coupled between a two-dimensional material and another conducting layer can exhibit optical confinement not possible with conventional plasmons. Here, we investigate acoustic plasmons supported in a monolayer and multilayers of black phosphorus (BP) placed shortly above a conducting plate. In the presence of a conducting plate, the acoustic plasmon dispersion for the armchair direction is found to exhibit the characteristic linear scaling in the mid- and far-infrared regime while it largely deviates from that in the long-wavelength limit and near-infrared regime. For the zigzag direction, such scaling behavior is not evident due to relatively tighter plasmon confinement. Further, we demonstrate a novel design for an acoustic plasmon resonator that exhibits higher plasmon confinement and resonance efficiency than BP ribbon resonators in the mid-infrared and longer wavelength regime. The theoretical framework and new resonator designs studied here provide a practical route toward the experimental verification of acoustic plasmons in BP and open up the possibility to develop novel plasmonic and optoelectronic devices that can leverage its strong in-plane anisotropy and thickness-dependent band gap.2018http://zaguan.unizar.es/record/7932210.1021/acsphotonics.8b00062http://zaguan.unizar.es/record/79322oai:zaguan.unizar.es:79322info:eu-repo/grantAgreement/ES/MINECO/MAT2014-53432-C5ACS photonics 5, 6 (2018), 2208-2216All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess