Field canalization using anisotropic 2D plasmonics

Abstract Optical devices capable of suppressing diffraction nature light are great technological importance to many nanophotonic applications. One important technique achieve diffractionless optics is exploit field canalization effect. However, current platforms based on metamaterial structures typically suffer from strict loss-confinement trade-off, or lack dynamic reconfigurability over device operations. Here we report an integrated platform that can alleviate this performance trade-off. It found by leveraging material absorption anisotropic 2D materials, the dispersion class materials flatten without increasing propagation losses and compromising confinement. The realization such plasmon be considered using black phosphorus (BP), where topological transition elliptic hyperbolic curves induced dynamically BP. At point, BP film support long range, deeply subwavelength, near-diffractionless propagation, exhibiting angle 5.5°, distance 10λ spp , λ < 0 /300 .