Bandgap and Wave Propagation Properties of 2D Curved and Chiral Hybrid Star‐Shaped Metamaterials
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Designing artificial microstructural metamaterials that fulfill the single‐phase vibration dampening and lightweight twin goals is challenging and critical. 2D curved and chiral hybrid star‐shaped metamaterials (CCHSM) are proposed to perform vibration reduction filtering in the midfrequency region by combining the properties of chiral structure and concave structure. The generating process of the bandgap of in‐plane elastic waves, the properties of directional attenuation, and the flow direction of energy in the dispersion curve are examined using the modal shape, dispersion surface, and group velocity. In a specific frequency range, the equivalent medium parameters satisfy the conditions of negative refraction transverse and longitudinal waves, so the structure also has double‐negative characteristics. The filtering performance is validated using the CCHSM periodic plate structure and a finite‐element simulation of transmission loss. In addition, the correlation between wave attenuation characteristics and structural parameters is explored. The radius of the circular arc and the deflection angle of the connecting rod have a significant impact on the frequency range of the structural bandgap. The results show that the created simple‐configured, single‐phase lightweight acoustic metamaterials exhibit strong local resonance properties and double‐negative features.Keywords:
Negative Refraction
Phase velocity
We demonstrate that the multibands of negative refraction indexes in the left-handed metamaterials may be appeared based on multiple dendritic structures cells. Employing microwave transmission experiment, the medium exhibits simultaneous negative refraction at the frequencies of 9.50, 10.24, and 10.78GHz for the electromagnetic wave parallel incidence, and at the frequencies of 9.24, 9.98, and 10.78GHz for normal incidence. The multiple dendritic metamaterials here open a way to prepare the cloak suitable for multifrequencies, especially for the cloak of infrared or visible frequency.
Negative Refraction
Split-ring resonator
Cloak
Photonic metamaterial
Transformation Optics
Metamaterial antenna
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In recent years, there has been a burgeoning interest in rapidly growing field of metamaterials due to their unprecedented properties unattainable from ordinary materials. Veselago pointed out that a material exhibiting negative values of dielectric permittivity (¿) and magnetic permeability (¿) would have a negative refractive index. Generally speaking, the dielectric permittivity (¿) and the magnetic permeability (¿) are both positive for natural materials. In fact it is possible to obtain negative values for ¿ and ¿ by utilizing proper designs of metamaterials. Left-handed electromagnetism and negative refraction are achievable with artificially structured metamaterials exhibiting negative values of permittivity and permeability simultaneously at a certain frequency region. The first steps to realize these novel type of materials were taken by Smith et al., where they were able to observe a left-handed propagation band at frequencies where both dielectric permittivity and magnetic permeability of the composite metamaterial are negative. Soon after, left-handed metamaterials with an effective negative index of refraction are successfully demonstrated by various groups.
Negative Refraction
Metamaterial cloaking
Photonic metamaterial
Transformation Optics
Metamaterial antenna
Split-ring resonator
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A U-band left-handed metamaterial is designed and simulated to obtain the scattering parameters after the dimensions are estimated according to the transimission line theory of the left-handed metamaterial.Furthermore,the properties of transmission and the negative electromagnetic parameters are analyzed after effective permittivity;effective permeability and refraction index are calculated by the Smith parameter retrieval method.The results show that the proposed left-handed metamaterial structure behaviours the negative refraction characteristic while the real parts of effective permittivity and effective permeability are both negative in 48.8~59.9 GHz band.Thus,the existence of the left-handed metamaterial in U-band is demonstrated,and it is of great reference significance to research on metamaterials in higher band.
Negative Refraction
Metamaterial antenna
Left handed
Negative index metamaterials
Split-ring resonator
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We report the first bulk metamaterials at visible frequencies that shows intriguing negative refraction for all incident angles. The metamaterial is realized by growing silver nanowire in a porous alumina template.
Negative Refraction
Visible spectrum
Photonic metamaterial
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Negative Refraction
Transformation Optics
Metamaterial cloaking
Photonic metamaterial
Superlens
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Single negative metamaterials have been deliberated on in this chapter along with their properties and potential applications. Left-handed metamaterials, which have negative refractive indices and are used in microwave and optical range structures are rereviewed. This chapter demonstrates the presence of an acoustical metamaterial with a negative effective density and bulk modulus, demonstrating that it is an effective medium in the most precise sense. For those unfamiliar, negative-index materials (NIMs) are a subset of metamaterials distinguished by an effective negative index, which results in peculiar wave phenomena, such as reverse negative refraction. We examined how metamaterials respond to electromagnetic behavior, these are manufactured media are manufactured materials that differ from those of their components. We also have discussed the history of negative index materials, the primary design approaches, and some potential applications, such as sub-wavelength resonant cavities. Several real-world applications of microwave technology are also analyzed. The most promising possibilities for future metamaterials study are highlighted.
Negative Refraction
Negative index metamaterials
Split-ring resonator
Photonic metamaterial
Metamaterial antenna
Superlens
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In this article, we present a new theory to explain the phenomenon of negative refraction in bulk metamaterials. Unlike earlier theories, it does not rely on the existence of a single mode of propagation in materials with negative constitutive parameters. It is based on the interaction and phase reversal effects caused by the existence of two simultaneous electromagnetic (EM) modes in uniform inhomogeneous metamaterial structures. The theory is general in the sense that it may be applied with equal validity to quasilumped circuit-based microwave metamaterials and to optical negative refraction in bulk nanowire metamaterials. Validity of the theory is demonstrated with EM simulations of microwave and optical metamaterials.
Negative Refraction
Photonic metamaterial
Snell's law
Transformation Optics
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Propagating electromagnetic waves in Left Handed Metamaterials (LHM) were introduced by Smith et al., in 2000 confirming Veselago's prediction in 1964 of their “reversed behavior. We will discuss LHMs, their properties, and potential applications.
Negative Refraction
Left handed
Negative index metamaterials
Transformation Optics
Photonic metamaterial
Superlens
Split-ring resonator
Acoustic Metamaterials
Metamaterial antenna
Metamaterial cloaking
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We review the studies conducted in our group concerning electromagnetic properties of metamaterials and photonic crystals with negative effective index of refraction. In particular, we demonstate the true left handed behavior of a 2D composite metamaterial, by analyzing the electric and magnetic response of the material components systematically. The negative refraction, subwavelength focusing, and flat lens phenomena using left handed metamaterials and photonic crystals are also presented.
Negative Refraction
Photonic metamaterial
Superlens
Metamaterial cloaking
Negative index metamaterials
Left handed
Transformation Optics
Split-ring resonator
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