Studies of permittivity and permeability of dielectric matrix with cuboid metallic inclusions in different orientations

Wu, Wen; Njoku, Chinwe C.; Whittow, William G.; Zagoskin, A. M.; Kusmartsev, F. V.; Vardaxoglou, J.C.

doi:10.1142/s2010135x14500325

Cited by 11 publications

(13 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The predicted phenomena of THz sensitivity in plasmonic metamaterials have first been confirmed at specific THz wavelengths for arrays of square and circular holes punctured in metal [28]. Similar behaviour has been achieved for films with cuboid metallic inclusions [29]. Here, the invisibility of these materials to THz waves is linked to impedance matching to vacuum resulting in a nearly perfect transmission.…”

Section: Introductionmentioning

confidence: 58%

Perfect Impedance Matching with Meta-Surfaces Made of Ultra-Thin Metal Films: A Phenomenological Approach to the Ideal THz Sensors

Zhang¹,

Liu²,

Luo³

et al. 2020

Materials

View full text Add to dashboard Cite

The terahertz (THz) frequency range is incredibly important as it covers electromagnetic emissions typical for biological and molecular processes. All molecules emit THz waves in a unique fingerprint pattern, although the intensity of such signals is usually too weak to be detected. To address the efficiency gap in existing THz devices it is extremely important to create surfaces with perfect anti-reflection properties. Although metals are absolutely reflective, here we show both theoretically and experimentally that by constructing meta-surfaces made of a superposition of ultra-thin metallic nano-films (a couple of nanometres thick) and oxide layers a unique property of perfect transmission and impedance matching may be realised. The perfect transmission rates can be as high as 100% and it may be achieved in both optical and THz regimes. The predicted effect has been observed for numerous meta-surfaces of different compositions. The effect found here is expected to impact the renewable energies sectors, optoelectronic and telecommunication industries, accelerating the arrival of the sensors for the new 6G-technology. The phenomenon is highly relevant to all scientific fields where minimising electromagnetic losses through reflection is important.

show abstract

Section: Introductionmentioning

confidence: 58%

Perfect Impedance Matching with Meta-Surfaces Made of Ultra-Thin Metal Films: A Phenomenological Approach to the Ideal THz Sensors

Zhang¹,

Liu²,

Luo³

et al. 2020

Materials

View full text Add to dashboard Cite

show abstract

“…For discussion on the size limitation of Equation () we refer the reader to ref. [42]. However, even if we take a rigorous approach to extract the required shape, the physics behind the AR mechanism still stems from the gradient index approach.…”

Section: Resultsmentioning

confidence: 99%

On‐Chip Metasurface‐on‐Facets for Ultra‐High Transmission through Waveguides in Near‐Infrared

Falek

Katiyi

Greenberg

et al. 2021

Advanced Optical Materials

View full text Add to dashboard Cite

Nature has long inspired scientists and engineers to develop transparent surfaces via constructing anti‐reflective surfaces. In absence of anti‐reflection (AR) coating, silicon reflects about 35% of light for a single interface air−silicon. Here, inspired by jellyfish anti‐reflective eyes, a man‐made anti‐reflective surface on the facet of the waveguide is proposed and demonstrated for waveguides transparency in near‐infrared. The optimized metamaterial with unit cells of 560 × 560 nm shows transparency of 2.6 times better as compared to the waveguide with blank facet. Metasurfaces are milled on the waveguides facets with a focused ion beam. Silicon‐on‐insulator waveguides are tested with an inline set‐up. Far‐field scattering diagrams reveal that it is the special geometry of the unit cells of the engraved metamaterial, which can be associated with the directional scattering resulting in combined effect: on one hand the ultra‐high transparency of the device and on the other hand the efficient coupling to the low‐order modes due to the focusing dielectric nano‐antennas effect. Reported here waveguide facets as AR metamaterials on a chip, opens up opportunities to engineer transparent on‐chip devices with high coupling efficiency for diverse applications from sensing to quantum technologies.

show abstract

“…Furthermore, the shapes of the metallic inclusions may result in anisotropy. The anisotropic and diamagnetic effects due to cuboid metallic inclusions have been analysed using EM simulations in [15,16], but fabrications of such heterogeneous material have not been widely reported in the literature. The artificial anisotropic dielectrics will give extra design freedom for future innovative antenna applications.…”

Section: Introductionmentioning

confidence: 99%

Additively manufactured artificial materials with metallic meta‐atoms

Zhang

Whittow

Vardaxoglou

2017

IET Microwaves, Antennas & Propagation

View full text Add to dashboard Cite

This study presents the analysis and fabrication of artificial materials with metallic cuboid inclusions (termed here as meta-atoms) in a dielectric host material. These synthetic materials or metamaterials have been additively manufactured with a fused deposition modelling three-dimensional (3D) printer. The effective permittivity and permeability have been numerically analysed using the Maxwell-Garnett and Lewin's approximation. Simulations and measurements have shown good agreement with analytical calculations. The anisotropy of the heterogeneous mixture due to the orientation of the meta-atoms has been demonstrated. The effective permittivity has been increased by the presence of the meta-atoms, which has the potential of producing 3D-printing metamaterials with tailored electromagnetic properties.

show abstract

Studies of permittivity and permeability of dielectric matrix with cuboid metallic inclusions in different orientations

Cited by 11 publications

References 32 publications

Perfect Impedance Matching with Meta-Surfaces Made of Ultra-Thin Metal Films: A Phenomenological Approach to the Ideal THz Sensors

Perfect Impedance Matching with Meta-Surfaces Made of Ultra-Thin Metal Films: A Phenomenological Approach to the Ideal THz Sensors

On‐Chip Metasurface‐on‐Facets for Ultra‐High Transmission through Waveguides in Near‐Infrared

Additively manufactured artificial materials with metallic meta‐atoms

Contact Info

Product

Resources

About