Controlling bi-anisotropy in infrared metamaterials using three-dimensional split-ring-resonators for purely magnetic resonance

Moritake, Yuto; Tanaka, Takuo

doi:10.1038/s41598-017-07026-w

Cited by 15 publications

(15 citation statements)

References 22 publications

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“…For experimental realization of the 3D-SRRs, metal-stress-driven self-folding method 17 , 18 , 24 , 25 as shown in Fig. 1(a) was employed in this study.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, planar structures, which are frequently used in metamaterial studies, have, in principle, no bi-anisotropy although there is a small amount of bi-anisotropy due to the presence of the substrate that breaks the inversion symmetry. On the other hand, three-dimensional (3D) structures have a great potential to achieve and control the bi-anisotropic response in metamaterials 10 – 18 . So far, we have demonstrated that 3D split ring resonators (SRRs) show bi-anisotropic response at magnetic resonance and controllability of this bi-anisotropic response through inversion symmetry 17 , 18 .…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, three-dimensional (3D) structures have a great potential to achieve and control the bi-anisotropic response in metamaterials 10 – 18 . So far, we have demonstrated that 3D split ring resonators (SRRs) show bi-anisotropic response at magnetic resonance and controllability of this bi-anisotropic response through inversion symmetry 17 , 18 . By rotating single-cut 3D-SRRs, inversion symmetry along the light propagation direction is improved and results in purely magnetic resonance in metamaterials 18 .…”

Section: Introductionmentioning

confidence: 99%

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Bi-anisotropic Fano resonance in three-dimensional metamaterials

Moritake

Tanaka

2018

Sci Rep

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We experimentally investigated the bi-anisotropic properties of Fano resonance in three-dimensional (3D) metamaterials. Fano resonance in 3D metamaterials arises from the interference of in-phase and anti-phase modes that originate from mode hybridization in coupled 3D split ring resonators (SRRs) with detuned resonant wavelengths. At Fano resonance, not only permittivity and permeability but also the bi-anisotropic parameter show doubly dispersive response. Manipulation of the bi-anisotropic response at Fano resonance was demonstrated through controlling the inversion symmetry of the 3D-SRRs. Improvement of inversion symmetry due to rotation of 3D-SRRs results in enhancement of magnetic response and inhibition of electric and bi-anisotropy responses at Fano resonance. Negligible electric and bi-anisotropic responses at Fano resonance were achieved due to the small radiative nature of the anti-phase mode. This bi-anisotropic Fano metamaterials with rich and tunable bi-anisotropy will extend the capabilities of new optical phenomena and broaden the applications of bi-anisotropic metamaterials.

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“…For experimental realization of the 3D-SRRs, metal-stress-driven self-folding method 17 , 18 , 24 , 25 as shown in Fig. 1(a) was employed in this study.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bi-anisotropic Fano resonance in three-dimensional metamaterials

Moritake

Tanaka

2018

Sci Rep

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“…Before deposition of gold, buffered hydro fluid treatment was performed to get better adhesion between silicon and gold. After forming the structures on the silicon substrate, inductive coupled plasma reactive ion etching (ICP-RIE, SAMCO, RIE200iPT) was performed with parameters of CF 4 plasma of flow rate of 20 sccm, pressure of 0.15 Pa, ICP power of 500 W, and forward power of 0 W. By setting forward power to 0 W, only the silicon substrate was isotropically etched [11,12]. Transmission spectra measured by the Fourier transform infrared (FT-IR) spectrometer (JASCO system FT/IR-6300FV) are shown in Fig.…”

Section: Preventing Red Shift Due To Substratementioning

confidence: 99%

Impact of substrate etching on plasmonic elements and metamaterials: preventing red shift and improving refractive index sensitivity

Moritake

Tanaka

2018

Opt. Express

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We propose and demonstrate the elimination of substrate influence on plasmon resonance by using selective and isotropic etching of substrates. Preventing the red shift of the resonance due to substrates and improving refractive index sensitivity were experimentally demonstrated by using plasmonic nanostructures fabricated on silicon substrates. Applying substrate etching decreases the effective refractive index around the metal nanostructures, resulting in elimination of the red shift. Improvement of sensitivity to the refractive index environment was demonstrated by using plasmonic metamaterials with Fano resonance based on far field interference. Change in quality factors (Q-factors) of the Fano resonance by substrate etching was also investigated in detail. The presence of a closely positioned substrate distorts the electric field distribution and degrades the Q-factors. Substrate etching dramatically increased the refractive index sensitivity reaching to 1532 nm/RIU since the electric fields under the nanostructures became accessible through substrate etching. The FOM was improved compared to the case without the substrate etching. The method presented in this paper is applicable to a variety of plasmonic structures to eliminate the influence of substrates for realizing high performance plasmonic devices.

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“…While a planar SRR (PSRR) can be fabricated using conventional lithography, fabrication of a vertical SRR (VSRR) is challenging, often requiring the combination of lithography and plating [10,18,30], deposition, or metal-stress driven self-folding [31]. However, these techniques require that the SRRs be bound to the top surface of the substrate, preventing any vertical displacement.…”

Section: Introductionmentioning

confidence: 99%

Enhancing Absorption Bandwidth through Vertically Oriented Metamaterials

et al. 2019

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Metamaterials research has developed perfect absorbers from microwave to optical frequencies, mainly featuring planar metamaterials, also referred to as metasurfaces. In this study, we investigated vertically oriented metamaterials, which make use of the entire three-dimensional space, as a new avenue to widen the spectral absorption band in the infrared regime between 20 and 40 THz. Vertically oriented metamaterials, such as those simulated in this work, can be experimentally realized through membrane projection lithography, which allows a single unit cell to be decorated with multiple resonators by exploiting the vertical dimension. In particular, we analyzed the cases of a unit cell containing a single vertical split-ring resonator (VSRR), a single planar split-ring resonator (PSRR), and both a VSRR and PSRR to explore intra-cell coupling between resonators. We show that the additional degrees of freedom enabled by placing multiple resonators in a unit cell lead to novel ways of achieving omnidirectional super absorption. Our results provide an innovative approach for controlling and designing engineered nanostructures.

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Controlling bi-anisotropy in infrared metamaterials using three-dimensional split-ring-resonators for purely magnetic resonance

Cited by 15 publications

References 22 publications

Bi-anisotropic Fano resonance in three-dimensional metamaterials

Bi-anisotropic Fano resonance in three-dimensional metamaterials

Impact of substrate etching on plasmonic elements and metamaterials: preventing red shift and improving refractive index sensitivity

Enhancing Absorption Bandwidth through Vertically Oriented Metamaterials

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