A planar polarization-insensitive metamaterial absorber

Cheng, Yongzhi; Yang, Helin; Cheng, Zhengze; Xiao, Bing

doi:10.1016/j.photonics.2010.07.002

Cited by 53 publications

(32 citation statements)

References 27 publications

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“…Typical absorbers possessing such properties have been reported in Refs. [16,17,19]. Absorbers of the second kind have a unit cell comprising one single or two separate inclusions which support electric and magnetic dipole modes resonating at the same frequency ω e ¼ ω m .…”

Section: Symmetric Total Absorption In a Single-layer Array Of Rementioning

confidence: 99%

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

et al. 2015

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Energy of propagating electromagnetic waves can be fully absorbed in a thin lossy layer, but only in a narrow frequency band, as follows from the causality principle. On the other hand, it appears that there are no fundamental limitations on broadband matching of thin resonant absorbing layers. However, known thin absorbers produce significant reflections outside of the resonant absorption band. In this paper, we explore possibilities to realize a thin absorbing layer that produces no reflected waves in a very wide frequency range, while the transmission coefficient has a narrow peak of full absorption. Here we show, both theoretically and experimentally, that a thin resonant absorber, invisible in reflection in a very wide frequency range, can be realized if one and the same resonant mode of the absorbing array unit cells is utilized to create both electric and magnetic responses. We test this concept using chiral particles in each unit cell, arranged in a periodic planar racemic array, utilizing chirality coupling in each unit cell but compensating the field coupling at the macroscopic level. We prove that the concept and the proposed realization approach also can be used to create nonreflecting layers for full control of transmitted fields. Our results can have a broad range of potential applications over the entire electromagnetic spectrum including, for example, perfect ultracompact wave filters and selective multifrequency sensors.

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Section: Symmetric Total Absorption In a Single-layer Array Of Rementioning

confidence: 99%

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

et al. 2015

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“…Recently, perfect absorption was demonstrated by utilizing structures with resonant metallic unit cells at the radio frequency (RF) [5][6][7][8][9][10], far-wavelength infrared (FIR) [11], mid-wavelength infrared (MIR) [12], near-infrared (NIR) [13][14][15][16][17], and visible [18] regions. Each design has its unique usefulness for specific applications in terms of spectral bandwidth, electrical thickness, polarization dependence, and the incidence angle dependent response.…”

Section: Introductionmentioning

confidence: 99%

Optically thin composite resonant absorber at the near-infrared band: a polarization independent and spectrally broadband configuration

Alıcı¹,

Turhan²,

Soukoulis³

et al. 2011

Opt. Express

122

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Abstract:We designed, fabricated, and experimentally characterized thin absorbers utilizing both electrical and magnetic impedance matching at the near-infrared regime. The absorbers consist of four main layers: a metal back plate, dielectric spacer, and two artificial layers. One of the artificial layers provides electrical resonance and the other one provides magnetic resonance yielding a polarization independent broadband perfect absorption. The structure response remains similar for the wide angle of incidence due to the sub-wavelength unit cell size of the constituting artificial layers. The design is useful for applications such as thermal photovoltaics, sensors, and camouflage. ©2011 Optical Society of America

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“…S2. It should be stressed that the proposed metamirror based on the wire inclusions is only a conceptual prototype and can be improved by using inclusions of other types 29,30 with the properties dictated by equations (1). The function-10 ality of the metamirror for incident waves from the −z-direction is presented in Supplementary Fig.…”

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confidence: 99%

Functional Metamirrors Using Bianisotropic Elements

et al. 2015

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Conventional mirrors obey Snell's reflection law: a plane wave is reflected as a plane wave, at the same angle. To engineer spatial distributions of fields reflected from a mirror, one can either shape the reflector (for example, creating a parabolic reflector) or position some phase-correcting elements on top of a mirror surface (for example, designing a reflectarray antenna). Here we show, both theoretically and experimentally, that full-power reflection with general control over reflected wave phase is possible with a single-layer array of deeply sub-wavelength inclusions. These proposed artificial surfaces, metamirrors, provide various functions of shaped or nonuniform reflectors without utilizing any mirror. This can be achieved only if the forward and backward scattering of the inclusions in the array can be engineered independently, and we prove that it is possible using electrically and magnetically polarizable inclusions. The proposed sub-wavelength inclusions possess desired reflecting properties at the operational frequency band, while at other frequencies the array is practically transparent. The metamirror concept leads to a variety of applications over the entire electromagnetic spectrum, such as optically transparent focusing antennas for satellites, multi-frequency reflector antennas for radio astronomy, low-profile conformal antennas for Conventional mirrors, known since the dawn of civilization 1 , obey the simple law of reflection: the reflection angle is equal to the incidence angle. This follows from the fact that the total tangential electric field at the ideal mirror surface is zero, thus, the phase of the electric field in the reflected wave is the opposite to that in the incident wave. If a reflector can be engineered to enable general control over the reflection phase, it is possible to change the direction of the reflected waves at will 2 . Developments in the field of antennas enabled creation of layers with any desired phase of reflection at microwaves. Conceptually, these devices are conventional mirrors, modified by some additional phase-shifting elements positioned close to fully reflecting surfaces. Such artificial layers, in particular conventional reflectarrays 3 and high-impedance surfaces 4 , are realized as arrays of resonant metal patches over a metal ground plane. All the patches of the array usually have identical shape but different dimensions, so that the resonance frequency of an individual patch varies to ensure the desired variations of the reflection phase over the array surface. Controlling the phase variation spanning a 2π range allows one to arbitrarily tune the shape and orientation of the reflected wavefront. Since the conventional reflectarrays incorporate a metal ground plane, the transmission through them is completely blocked and reflection amplitude can be very high if low-loss materials are used. On the other hand, the presence of a metal ground plane forbids transmission at all practically interesting frequencies and limits the application possibilities....

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A planar polarization-insensitive metamaterial absorber

Cited by 53 publications

References 27 publications

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

Broadband Reflectionless Metasheets: Frequency-Selective Transmission and Perfect Absorption

Optically thin composite resonant absorber at the near-infrared band: a polarization independent and spectrally broadband configuration

Functional Metamirrors Using Bianisotropic Elements

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