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Research Papers: Micro/Nanoscale Heat Transfer

Tungsten Nanowire Metamaterials as Selective Solar Thermal Absorbers by Excitation of Magnetic Polaritons

[+] Author and Article Information
Jui-Yung Chang, Hao Wang

School for Engineering of Matter,
Transport, and Energy,
Arizona State University,
Tempe, AZ 85287

Liping Wang

School for Engineering of Matter,
Transport, and Energy,
Arizona State University,
Tempe, AZ 85287
e-mail: liping.wang@asu.edu

1Corresponding author.

Presented at the 2016 ASME 5th Micro/Nanoscale Heat & Mass Transfer International Conference. Paper Number MNHMT2016-6471.Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 3, 2016; final manuscript received June 20, 2016; published online February 7, 2017. Assoc. Editor: Zhuomin Zhang.

J. Heat Transfer 139(5), 052401 (Feb 07, 2017) (8 pages) Paper No: HT-16-1053; doi: 10.1115/1.4034845 History: Received February 03, 2016; Revised June 20, 2016

The present study focuses on nanowire-based metamaterials selective solar absorbers. Finite-difference time-domain (FDTD) simulation is employed for numerically designing a broadband solar absorber made of lossy tungsten nanowires which exhibit spectral selectivity due to the excitation of magnetic polariton (MP). An inductor–capacitor circuit model of the nanowire array is developed in order to predict the resonance wavelengths of the MP harmonic modes. The effects of geometric parameters such as nanowire diameter, height, and array period are investigated and understood by the sweep of geometric parameters, which tunes the MP resonance and the resulting optical and radiative properties. In addition, the optical properties and conversion efficiency of this nanowire-based absorber are both demonstrated to be insensitive on incidence angles, which illustrates the potential applicability of the proposed nanowire-based metamaterial as a high-efficiency wide-angle selective solar absorber. The results show that the nanowire-based selective solar absorber with base geometric parameters can reach 83.6% of conversion efficiency with low independence of incident angle. The results will facilitate the design of novel low-cost and high-efficiency materials for enhancing solar thermal energy harvesting and conversion.

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References

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Figures

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Fig. 1

Schematic of the tungsten nanowire-based selective absorber

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Fig. 2

The spectral absorptance of the selective absorber (a) based on FDTD simulation and EMT and (b) FDTD simulation with fixed filling ratio

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Fig. 3

The contour plots of electromagnetic field distribution on the x–z plane when MP resonances are excited at wavelengths of (a) 2.66 μm, (b) 0.93 μm, (c) 0.52 μm, and (d) 0.36 μm

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Fig. 4

(a) The LC circuit model based on charge and field distribution and (b) the electromagnetic field distribution on the x–y plane located at 0.3 μm above the bottom of the nanowires when MP is excited at 2.66 μm in wavelength

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Fig. 5

The spectral absorptance with respect to different nanowires: (a) array period, (b) diameter, and (c) height simulated by FDTD

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Fig. 6

The MP1 wavelengths predicted by FDTD and LC circuit model with respect to different nanowires: (a) array period, (b) diameter, and (c) height

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Fig. 7

The spectral absorptance at two resonance frequencies (MP2 and MP3) as a function of incident angle under (a) s-polarized, (b) p-polarized, and (c) unpolarized waves

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Fig. 8

The comparison of conversion efficiencies between ideal, nanowire-based, bare tungsten, and blackbody absorbers with different (a) absorber temperatures and (b) concentration factors

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