Optical magnetic response in three-dimensional metamaterial of upright plasmonic meta-molecules

Abstract

We report the first three-dimensional photonic metamaterial, an array of erected U-shape plasmonic gold meta-molecules, that exhibits a profound response to the magnetic field of light incident normal to the array. The metamaterial was fabricated using a double exposure e-beam lithographic process. It was investigated by optical measurements and finite-element simulations, and showed that the magnetic field solely depends on the plasmonic resonance mode showing either enhanced in the centre of the erected U-shape meta-molecule (16 times enhancement) or enhanced around two prongs of erected U-shape meta-molecule (4 times enhancement).

Directly patterned substrate-free plasmonic “nanograter” structures with unusual Fano resonances

“…Conventionally, the resonances of an SRR can be excited by incident light with the electric field (E) polarized parallel to the U-plane (for instance, along the x-direction as shown in Figure 3a) or, alternatively, with the magnetic field perpendicular to the U-plane 36,40 . Therefore, in SRRs reported thus far, including planar 36,40 , vertical 41,42 , and multilayered 3,14 SRR structures, an unconventional excitation scheme in which the electric field is polarized perpendicular to the U-plane in the y-direction would normally induce no electromagnetic resonance and hence has usually remained unexplored. Here, we demonstrate that under such unconventional excitation of the MH-VSRRs, the integration of SRRs significantly changes the extraordinary optical transmission (EOT) 43 properties of the original MH arrays.…”

Realization of Variable Three‐Dimensional Terahertz Metamaterial Tubes for Passive Resonance Tunability

“…The resonance induced by the electric fi eld is at the same frequency as that induced by magnetic fi eld. [20][21][22] Therefore, the resonance excited by magnetic and electric fi elds reinforce each other, making the resonance stronger.…”

Fabrication of multilayer metamaterials by femtosecond laser‐induced forward‐transfer technique

“…A split-ring resonator (SRR) is one of the most commonly adopted structure units to construct plasmonic metamaterials [7][8][9][10]. For such SRR-based metamaterials, when the incident light hits the plasmonic resonance(s) of an individual SRR, the effective permeability/permittivity of the whole medium are then efficiently changed, depending on the nature of resonance [11].…”

“…For such SRR-based metamaterials, when the incident light hits the plasmonic resonance(s) of an individual SRR, the effective permeability/permittivity of the whole medium are then efficiently changed, depending on the nature of resonance [11]. To excite the magnetic (fundamental) resonances of planar SRRs, the incident light should exhibit an electric-field component perpendicular to two prongs or a magnetic-field component normal to the plane of SRR structures [8,11]. Besides their fundamental electromagnetic (EM) properties, near-field coupling effects between plasmonic metamaterials has begun to attract lots of attention recently [12][13][14][15], leading to many fascinating physical phenomena such as Fano resonance [14] and toroidal dipolar response [15], in different EM wave spectra.…”

“…Although a number of technologies such electron beam lithography with multiexposed processes have been reported and used to fabricated multilayer and three-dimensional plasmonic structures [8,12,16], the alignment error is very difficult to fine control [16]. Moreover, in order to fabricated multilayer plasmonic structures, the electron beam lithography process is very complicated and time consuming.…”