Applicability of nonresonant artificial diamagnetics

Abstract

Artificial diamagnetics are prominent for achieving extraordinarily strong diamagnetism in a wide frequency range. However, as far as the magnetic fields outside the artificial medium are concerned, bulk conductors show a very similar pattern. The question arises whether the complicated internal structure of artificial diamagnetics can, to this end, be replaced by a simpler object. We show that for an electrically small body, internal structuring is likely to make the effective diamagnetic response weaker than that of a simple conducting object.

Evaluation of polarisability tensors of arbitrarily shaped highly conducting bodies

“…Note that the non‐vanishing magnetic polarisability in the static limit is a consequence of using PEC. Even negligibly small losses will lead to for , see [3, 45] and the references therein…”

“…Even negligibly small losses will lead to αmm = 0 for ka → 0, see [3], [45] and the references therein.…”

New degrees of freedom in nonlinear metamaterials

“…However, coupling between electromagnetic and elastic phenomena is possible and useful if a non‐resonant system is designed. Indeed, non‐resonant metamaterials prove to be quite capable of enhancing material properties, for example, providing strong artificial diamagnetism competitive with ideal metals …”

“…However, coupling between electromagnetic and elastic phenomena is possible and useful if a non-resonant system is designed. Indeed, non-resonant metamaterials prove to be quite capable of enhancing material properties, for example, providing strong artificial diamagnetism [200] competitive with ideal metals [201] In optics, non-resonant structures are useful, for example, in designing artificial electrostriction [202]. Metamaterials for artificial electrostriction can be as simple as an array of spheres embedded into a matrix of a different material.…”