Magnetic Metamaterials at Telecommunication and Visible Frequencies

Abstract

Arrays of gold split rings with a 50-nm minimum feature size and with an LC resonance at 200 THz frequency (1:5 m wavelength) are fabricated. For normal-incidence conditions, they exhibit a pronounced fundamental magnetic mode, arising from a coupling via the electric component of the incident light. For oblique incidence, a coupling via the magnetic component is demonstrated as well. Moreover, we identify a novel higher-order magnetic resonance at around 370 THz (800 nm wavelength) that evolves out of the Mie resonance for oblique incidence. Comparison with theory delivers good agreement and also shows that the structures allow for a negative magnetic permeability.

Three-Dimensional Metamaterials with an Ultrahigh Effective Refractive Index over a Broad Bandwidth

“…In contrast to our work, previous approaches to enhancing the refractive index utilized either electronic resonances in atoms [5] or electromagnetic resonances such as split-ring resonators [6,7]. These schemes are inherently narrowband and work only in the vicinity of a resonant frequency.…”

Fabrication and evaluation of photonic metamaterial crystal

“…The metamaterial, which has the negative refractive index [1][2][3], is composed by LC resonance structure elements and background dielectric material [4][5][6][7]. We used typical SRR as the LC-resonance elements and arranged them in 2 dimensional square lattices or rectangular one to construct metamaterial which has a fundamental resonance frequency in near-infrared optical frequency and higher order resonance frequency in visible one.…”

Nanoplasmonic Filters for Hollow Core Photonic Crystal Fibers

“…28 The symmetry of the bands is crucial to determine the coupling efficiency of light incident on the filter. 29 Figure 2a) shows the y-component of the electric field in the xy plane for two contiguous bands in the working wavelength region. Light incident on the sample couples efficiently only to the antisymmetric band centred at 800 nm, whereas the coupling to symmetric bands (higher and lower frequencies) is not as efficient.…”