Ghost surface polariton in antiferromagnets

Song, Haoyuan; Wang, Xiang-Guang; Zhang, Yuqi; Hao, Shaopeng; Wang, Xuan-Zhang

doi:10.1103/physrevb.106.024425

Cited by 11 publications

(3 citation statements)

References 26 publications

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“…A possible answer is provided by the metasurface junction in Figure . The basic idea, in analogy with the GSP scenario, − is to tailor the surface reactance of the isotropic half so that a LW can propagate along the metasurface junction with a real-valued propagation constant k z (LW) . From analogies with the isotropic-junction scenario, ,, we expect the field behavior at the interface to possibly exhibit a singularity, and therefore be quite different from conventional SWs.…”

Section: Resultsmentioning

confidence: 99%

“…More recent studies have focused on the surface-wave (SW) realization of GWs. In particular, ghost surface polaritons (GSP) have been theoretically predicted in ionic-crystal (ZnS/ SiO 2 ) metamaterials 7 and antiferromagnets, 8 and have been experimentally observed in a bulk calcite crystal. 9 Even in an idealized lossless scenario, these wave modes are characterized by a complex-valued out-of-plane wavevector, thereby combining the traits of conventional bulk and surface polaritons, with both propagating (phase accumulation) and evanescent (exponential decay) behavior inside the crystal.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Here we show that, in the presence of (lossless) anisotropy, a new kind of LW can be supported exhibiting GW-type behavior (i.e., phase oscillations combined with evanescent decay) both in-plane (along the metasurface) and out-of-plane (in the surrounding medium). These ghost LWs (GLWs) can be viewed as the one-dimensional version of GWs , and GSPs, − and they share several intriguing features with their higher-dimensional equivalents, opening up new perspectives in interface nano-optics for the advanced control of surface polaritons in deeply subdiffractive regimes. , …”

Section: Introductionmentioning

confidence: 99%

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Ghost Line Waves

et al. 2023

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Time-harmonic electromagnetic plane waves in anisotropic media can exhibit complex-valued wavevectors (with nonzero real and imaginary parts) even in the absence of material dissipation. These peculiar modes, usually referred to as "ghost waves", hybridize the typical traits of conventional propagating and evanescent waves, displaying both phase accumulation and purely reactive exponential decay away from the direction of the power flow. Their existence has been predicted in several scenarios and has been recently observed experimentally in the form of surface phonon polaritons with complexvalued out-of-plane wavevectors propagating at the interface between air and a natural uniaxial crystal with slanted optical axis. Here, we demonstrate that ghost waves can arise also in lower-dimensional flatoptics scenarios, which are becoming increasingly relevant in the context of metasurfaces and in the field of polaritonics. Specifically, we show that planar junctions between isotropic and anisotropic metasurfaces can support "ghost line waves" that propagate unattenuated along the line interface, exhibiting phase oscillations combined with evanescent decay both in the plane of the metasurface (away from the interface) and out-of-plane in the surrounding medium. Our theoretical results, validated by finiteelement numerical simulations, demonstrate a novel form of polaritonic waves with highly confined features, which may provide new opportunities for the control of light at the nanoscale and may find potential applications in a variety of scenarios, including integrated waveguides, nonlinear optics, optical sensing, and subdiffraction imaging.

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