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Research Papers: Radiative Heat Transfer

Widening Absorption Band of Grating Structure With Complex Dual-Groove Grating

[+] Author and Article Information
L. H. Liu

e-mail: lhliu@hit.edu.cn
School of Energy Science and Engineering,
Harbin Institute of Technology,
92 West Dazhi Street,
Harbin 150001,
Heilongjiang, People's Republic of China

P.-F. Hsu

Department of Mechanical and Aerospace Engineering,
Florida Institute of Technology,
Melbourne, FL 32901

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 11, 2012; final manuscript received October 1, 2012; published online February 8, 2013. Assoc. Editor: Zhuomin Zhang.

J. Heat Transfer 135(3), 032701 (Feb 08, 2013) (10 pages) Paper No: HT-12-1009; doi: 10.1115/1.4007881 History: Received January 11, 2012; Revised October 01, 2012

The wavelength-selective radiative property is becoming a noticeable requirement in various technological fields. There are many researches that have been focused on the radiative properties of metal periodic microstructure surface. However, the spectral bandwidth of high absorptance is often too narrow if excited by the conventional grating structures. In order to solve this problem, two novel periodic grating structures are proposed in this paper, which can increase the effective bandwidth of high absorption peaks. One of the new periodic grating structures, called dual-groove grating, is constructed by adding a rectangular groove at the bottom of the simple grating's groove through a secondary microscale processing. The other grating structure, which is called complex dual-groove grating, is constructed by superposing a dual-groove grating with a simple grating within one period. Aluminum grating structure is taken as an example to show the advantage of proposed structures on increasing effective bandwidth of high absorption peaks within mid-infrared and far-infrared spectra. The rigorous coupled-wave analysis (RCWA) is used to calculate the absorptance of periodic grating structures. The results shows that, two close absorption peaks and three connecting absorption peaks are obtained respectively for the two periodic grating structures. The effective bandwidth of high absorption peaks within interested wavelength band is improved obviously by these two microscale grating structures.

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Figures

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Fig. 1

Schematic of (a) simple grating structure, (b) dual-groove grating structure, and (c) complex dual-groove grating structure

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Fig. 2

Curve of (a) optical constants of aluminum and (b) absorptance of aluminum plane at normal incidence

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Fig. 3

Comparison of the calculation result from this work and Ref. [18] to verify the validity of RCWA in this study

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Fig. 4

The contour plot of spectral absorptance varies with groove height h1 and wavelength for the simple grating with feature in Fig. 1(a) at θ = 0 deg

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Fig. 5

The effective bandwidth for the wavelength band of 8–11 μm with increased h1 of the simple grating

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Fig. 6

The electromagnetic field distribution with incident wavelength of 9.48 μm in simple grating structure at θ = 0 deg for (a) h1 = 1.9 μm and (b) h1 = 6.5 μm. The contour indicates the logarithm of the square of the magnetic field and the arrows represent the electric field vectors.

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Fig. 7

The contour plot of absorption of simple grating as functions of wavelengths and incidence angles

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Fig. 8

The contour plot of spectral absorptance varies with the upper groove height h and wavelength for the dual-groove grating with feature in Fig. 1(b) at θ = 0 deg

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Fig. 9

The effective bandwidth for the wavelength band of 8–11 μm with increased h of the dual-groove grating

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Fig. 10

The electromagnetic field distribution at (a) 10.23 μm; (b) 8.53 μm; (c) 6.18 μm, and (d) 3.98 μm in dual-groove grating structure at θ = 0 deg in the case of h = 6.4 μm. The contour indicates the logarithm of the square of the magnetic field and the arrows represent the electric field vectors.

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Fig. 11

The contour plot of absorption of dual-groove grating as functions of wavelengths and incidence angles

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Fig. 12

The contour plot of spectral absorptance varies with the upper ridge width l and wavelength for the dual-groove grating with feature in Fig. 1(b) at θ = 0 deg

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Fig. 13

The effective bandwidth for the wavelength band of 8–11 μm with increased l of the dual-groove grating

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Fig. 14

The contour plot of spectral absorptance varies with w2 and wavelength for the complex dual-groove grating with feature in Fig. 1(c) at θ = 0 deg

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Fig. 15

The effective bandwidth for the wavelength band of 8–11 μm with increased w2 of the complex dual-groove grating

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Fig. 16

The electromagnetic field distribution at (a) 8.43 μm; (b) 9.38 μm, and (c) 10.33 μm in complex dual-groove grating structure at θ = 0 deg. The contour indicates the logarithm of the square of the magnetic field and the arrows represent the electric field vectors.

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Fig. 17

The contour plot of absorption of complex dual-groove grating as functions of wavelengths and incidence angles

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Fig. 18

Spectral absorptance of three grating structures proposed in present study at wavelength band of 8–11 μm

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Fig. 19

The contour plot of spectral absorptance varies with w3 and wavelength for (a) the dual-groove grating with feature in Fig. 1(b) at θ = 0 deg, (b) the complex dual-groove grating with feature in Fig. 1(c) at θ = 0 deg, and (c) spectral absorptance comparison of different w3 dimensions at wavelength band of 8–11 μm

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