A selective metasurface absorber with an amorphous carbon interlayer for solar thermal applications

Wan, Chenglong; Ho, Y.-L. D.; Núñez-Sánchez, Sara; Chen, Lifeng; López‐García, Martín; Pugh, Jon R; Zhu, Bofeng; Selvaraj, Prabhakaran; Mallick, Tapas K.; Sundaram, S.; Cryan, Martin J

doi:10.1016/j.nanoen.2016.05.013

Cited by 25 publications

(16 citation statements)

References 23 publications

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“…We should note here that the applications of optical metasurfaces in the general sense of the word (i.e., patterned thin layers on a substrate) go beyond spatial wavefront manipulation. Thin light absorbers [79][80][81][82][83][84][85][86][87][88][89][90][91][92][93], optical filters [94][95][96][97][98][99][100][101][102][103][104][105][106], nonlinear [107][108][109][110][111][112][113][114], and anapole metasurfaces [115,116] are a few examples of such elements. This review is focused on applications of metasurfaces in wavefront manipulation, and therefore it doesn't cover these other types of metasurfaces.…”

Section: Recent Developmentsmentioning

confidence: 99%

A review of dielectric optical metasurfaces for wavefront control

et al. 2018

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During the past few years, metasurfaces have been used to demonstrate optical elements and systems with capabilities that surpass those of conventional diffractive optics. Here we review some of these recent developments with a focus on dielectric structures for shaping optical wavefronts. We discuss the mechanisms for achieving steep phase gradients with high efficiency, simultaneous polarization and phase control, controlling the chromatic dispersion, and controlling the angular response. Then we review applications in imaging, conformal optics, tunable devices, and optical systems. We conclude with an outlook on future potentials and challenges that need to be overcome. A. High-efficiency high-gradient phase controlSince high-contrast transmitarrays (HCA) are central to the most of the discussions of this section, we first briefly discuss their operation. We are primarily interested in the two-dimensional HCAs, and therefore we consider their case here, although much of the discussions are also valid for the one-dimensional case. In general, these devices are based on high-refractive-index dielectric nano-scatterers surrounded by low-index media [13, 38, 65, 67, 70-72, 76, 78]. The structure can be symmetric (i.e., with the substrate and capping layers having the same refractive indexes) [36] or asymmetric [66,67,76,78]. Depending on the materials and the required phase coverage, the thickness of the high-index layer is usually between 0.5λ 0 and λ 0 , where λ 0 is the free space wavelength. Typically, these structures are designed to be compatible with conventional microfabrication techniques;

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Section: Recent Developmentsmentioning

confidence: 99%

A review of dielectric optical metasurfaces for wavefront control

et al. 2018

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“…[1][2][3][4][5][6] Metasurfaces offer new degrees freedom for controlling light beams on a smaller scale and with higher accuracy than is possible with conventional bulky optical components by controlling the optical path length. Initial demonstrations of metasurfaces involved plasmonic resonances, which, however, are rather lossy and exhibit low efficiency.…”

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confidence: 99%

Efficient Silicon Metasurfaces for Visible Light

Zhou¹,

Li²,

Su³

et al. 2017

ACS Photonics

238

184

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Dielectric metasurfaces require high refractive index contrast materials for optimum performance. This requirement imposes a severe restraint; devices have either been demonstrated at wavelengths of 700nm and above using high-index semiconductors such as silicon, or they use lower index dielectric materials such as TiO2 or Si3N4 and operate in the visible wavelength regime.Here, we show that the high refractive index of silicon can be exploited at wavelengths as short as 532 nm by demonstrating a silicon metasurface with a transmission efficiency of 47% at this wavelength. The metasurface consists of a graded array of silicon posts arranged in a square lattice on a quartz substrate. We show full 2π phase control and we experimentally demonstrate

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“…After that, the Ti film of 190 nm, SiO 2 film of 70 nm, Ti film of 20 nm and TiN film of 20 nm were respectively plated on the Si surface through magnetron sputtering. At last, the cross shape could be gained by standard photolithography [48].…”

Section: Introductionmentioning

confidence: 99%

Ultra-Broadband High-Efficiency Solar Absorber Based on Double-Size Cross-Shaped Refractory Metals

Niu

Zhang

et al. 2020

Nanomaterials

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In this paper, a theoretical simulation based on a finite-difference time-domain method (FDTD) shows that the solar absorber can reach ultra-broadband and high-efficiency by refractory metals titanium (Ti) and titanium nitride (TiN). In the absorption spectrum of double-size cross-shaped absorber, the absorption bandwidth of more than 90% is 1182 nm (415.648-1597.39 nm). Through the analysis of the field distribution, we know the physical mechanism is the combined action of propagating plasmon resonance and local surface plasmon resonance. After that, the paper has a discussion about the influence of different structure parameters, polarization angle and angle of incident light on the absorptivity of the absorber. At last, the absorption spectrum of the absorber under the standard spectrum of solar radiance Air Mass 1.5 (AM1.5) is studied. The absorber we proposed can be used in solar energy absorber, thermal photovoltaics, hot-electron devices and so on.

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A selective metasurface absorber with an amorphous carbon interlayer for solar thermal applications

Cited by 25 publications

References 23 publications

A review of dielectric optical metasurfaces for wavefront control

A review of dielectric optical metasurfaces for wavefront control

Efficient Silicon Metasurfaces for Visible Light

Ultra-Broadband High-Efficiency Solar Absorber Based on Double-Size Cross-Shaped Refractory Metals

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