Abstract
Harnessing artificial optical magnetism has previously required complex two- and three-dimensional structures, such as nanoparticle arrays and split-ring metamaterials. By contrast, planar structures, and in particular dielectric/metal multilayer metamaterials, have been generally considered non-magnetic. Although the hyperbolic and plasmonic properties of these systems have been extensively investigated, their assumed non-magnetic response limits their performance to transverse magnetic (TM) polarization. We propose and experimentally validate a mechanism for artificial magnetism in planar multilayer metamaterials. We also demonstrate that the magnetic properties of high-index dielectric/metal hyperbolic metamaterials can be anisotropic, leading to magnetic hyperbolic dispersion in certain frequency regimes. We show that such systems can support transverse electric polarized interface-bound waves, analogous to their TM counterparts, surface plasmon polaritons. Our results open a route for tailoring optical artificial magnetism in lithography-free layered systems and enable us to generalize the plasmonic and hyperbolic properties to encompass both linear polarizations.
Highlights
Harnessing artificial optical magnetism has previously required complex two- and threedimensional structures, such as nanoparticle arrays and split-ring metamaterials
In conclusion, we have shown that non-unity effective magnetic permeability at optical frequencies can be obtained in 1D-layered systems, arising from displacement currents in dielectric layers
This makes it possible to tailor the magnetic response of planar hyperbolic metamaterials (HMMs), which have been previously explored only for their dielectric permittivity features
Summary
Harnessing artificial optical magnetism has previously required complex two- and threedimensional structures, such as nanoparticle arrays and split-ring metamaterials. We demonstrate that the magnetic properties of high-index dielectric/metal hyperbolic metamaterials can be anisotropic, leading to magnetic hyperbolic dispersion in certain frequency regimes We show that such systems can support transverse electric polarized interface-bound waves, analogous to their TM counterparts, surface plasmon polaritons. Heterostructures of alternating metallic and dielectric layers, termed hyperbolic metamaterials (HMMs), have been explored intensively the last decade[11,12,13] due to their anisotropic dielectric response that is described by the dielectric permittivity tensor εeff = diag{εo, εo, εe}, where εo and εe are the ordinary and extraordinary components of the tensor, with εoεe < 0 Such a peculiar dielectric response manifests itself in the hyperbolic dispersion for transverse magnetic (TM) waves (i.e., k ⋅ H = 0 whereas k ⋅ E ≠ 0). Interesting phenomena such as negative refraction[11,14,15,16,17,18] without the need of a negative refractive index, hyper-lensing[19], extreme enhancement in the density of optical states[13], and interface-bound plasmonic modes[20,21,22,23,24,25] have been reported
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