Broadband wide-angle polarization-insensitive metasurface solar absorber

Heidari, Mehdi; Sedighy, Seyed Hassan

doi:10.1364/josaa.35.000522

Cited by 42 publications

(15 citation statements)

References 17 publications

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“…[ 45 ] The angular performance of the device would be improved by more carefully designing the shapes and arrangement methods of the units in the supercell. [ 46,47 ] In the meantime, the bandwidth of the device could be enhanced by incorporating more resonant structures in a supercell. [ 17,18 ]…”

Section: Resultsmentioning

confidence: 99%

Ultrathin Electromagnetic–Acoustic Amphibious Stealth Coats

Zhou

Chen

et al. 2020

Advanced Optical Materials

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Radar and sonar technologies are generally used to detect objects in air space and water. In some cases, both technologies are involved in probing waterborne objects like submarines. However, the simultaneous stealth regarding these two detection methods is not well explored due to the difficulty in satisfying material properties for two different physical systems. In this work, an artificial ultrathin amphibious stealth coat with a minimum thickness less than 0.5 mm achieving free‐space microwave and underwater acoustic absorption is proposed and demonstrated. It is realized by combining an electromagnetic metasurface and an acoustic metasurface—a flexible printed circuit with multisized metal resonators and a polydimethylsiloxane film with multisized air cavities. These two alien metasurfaces are engineered with minimized disturbance to each other by controlling the thicknesses of the resonators as thin as possible. A free‐space microwave absorptivity over 80% in the 12.38–13.7 GHz region and an underwater acoustic reflectance less than 10% in the 80–160 kHz region are obtained experimentally. The current work may shed light on advanced stealth technologies of the free‐space microwaves and underwater acoustic waves.

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Section: Resultsmentioning

confidence: 99%

Ultrathin Electromagnetic–Acoustic Amphibious Stealth Coats

Zhou

Chen

et al. 2020

Advanced Optical Materials

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“…Si-and Ni-based MMAs can be applicable with above 90% absorption for the optical wavelength and above 99% from 500nm to 560nm [62]. A genetic algorithm (GA)-based MMA consisting of Au-SiO2-Au had above 90% absorption with 40⁰ angular stability for TE and TM polarizations [63]. An MMA with an arbitrary cutting top layer with quartz substrate with two gold layers had above 80% absorption from 575nm to 760nm with four nearunity peaks [64].…”

Section: Introductionmentioning

confidence: 99%

A Wide Incident Angle, Ultrathin, Polarization-Insensitive Metamaterial Absorber for Optical Wavelength Applications

et al. 2020

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Polarization-insensitive metamaterial absorbers (MMAs) are currently attracting a great deal of interest throughout the optical region. These kinds of MMAs can be used as energy harvesting, thermal imaging, plasmonic sensor, magnetic imaging, light trapping, optical modulator, and can help to decipher an inherence for the field. Here, a polarization-insensitive ultrathin MMA has been proposed with an extensive incident angular stability for the optical region with a sandwiched three-layer structure. Tungsten (W) and silicon dioxide (SiO2) have been chosen as materials for their various advantages in the optical spectrum with higher temperature stability. The design simulated with the finite integration technique (FIT), and validation of the simulated data is assured with the interference theory model (ITM). Underlying physics of the absorption characteristics and performance of the structure are immensely explained. The design acquired an average absorption of 96.7% from 380nm to 700nm and 96.61% for both transverse electric (TE) and transverse magnetic (TM) polarization. It has a peak absorption of 99.99% at 498.25nm, and over 99% from 460nm to 540nm, due to a very good impedance match with plasmonic resonance characteristics. For both TE and TM mode, it has wide angular independence up to 60⁰, which can be used for solar cell and solar thermo-photovoltaics (STPV). The various parametric sweep also analyzed for acquiring the geometric shape with a wide bandwidth to find resonance wavelength. As the MMA shifts its resonance wavelength with the change of its dielectric thickness, it can be used as an optical sensor. Changing dielectric in a Pyrex will enable the structure to be used as a light detector. Such outstanding absorption properties render the proposed MMA a successful candidate for the optical wavelength applications mentioned above. INDEX TERMS polarization-insensitive, metamaterial absorber, incident angular stability, impedance match, plasmonic resonance characteristics.

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“…A straightforward method to broaden the absorption spectra is to integrate multiple resonances in one unit cell. Collected in [2], [10], [11], there are four mainstream tactics: planarly tiling multi-size resonators [12]- [14], vertically stacking multi-size resonators [15], [16], dispersing plasmonic nanocomposites [3], [17]- [22] and space-filling with nontrivial patterns [23], [24]. Some designs like using lumped elements [25], adopting high intrinsic loss material [26]- [28] and constructing non-resonant impedance match materials [11], [29] are also proposed to achieve broadband absorption.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Broadband Perfect Absorber by Weierstrass Factorization

Ming

Sun

2019

IEEE Photonics J.

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We present a new method based on Weierstrass factorization to optimize broadband perfect absorber (BPA) made of metal-dielectric-metal elements, which is an efficient and general approximation to calculate the absorption of these subwavelength structures. With the resonant wavelengths estimated by semi-analytical equations, we design a planar BPA tiling three subunits in one unit cell and a vertical tapered BPA stacking 20 pairs of metal-dielectric layers in one unit cell. Both BPAs shows almost over 90% and wide angle absorption in the concerned range. This method can be an alternative to the traditional full vector methods in initial design.

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Broadband wide-angle polarization-insensitive metasurface solar absorber

Cited by 42 publications

References 17 publications

Ultrathin Electromagnetic–Acoustic Amphibious Stealth Coats

Ultrathin Electromagnetic–Acoustic Amphibious Stealth Coats

A Wide Incident Angle, Ultrathin, Polarization-Insensitive Metamaterial Absorber for Optical Wavelength Applications

Optimization of Broadband Perfect Absorber by Weierstrass Factorization

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