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Research Papers

Thermal Radiative Properties of a SiC Grating on a Photonic Crystal

[+] Author and Article Information
Ceji Fu

e-mail: cjfu@pku.edu.cn

Wenchang Tan

LTCS and Department of Mechanics
and Engineering Science,
College of Engineering,
Peking University,
Beijing 100871, China

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received July 1, 2012; final manuscript received January 16, 2013; published online July 26, 2013. Assoc. Editor: Zhuomin Zhang.

J. Heat Transfer 135(9), 091504 (Jul 26, 2013) (6 pages) Paper No: HT-12-1342; doi: 10.1115/1.4024468 History: Received July 01, 2012; Revised January 16, 2013

Spectral and directional control of thermal emission holds substantial importance in different kinds of applications, where heat transfer is predominantly by thermal radiation. Several configurations have previously been proposed, like using gratings, photonic crystals (PCs) and resonant cavities. In the present work, we investigate the thermal radiative properties of a microstructure consisting of a SiC grating on a photonic crystal. The emissivity of the microstructure is calculated with the rigorous coupled-wave analysis (RCWA) algorithm as a function of the angular frequency and the emission angle. The results reveal that thermal emission from the microstructure can exhibit very novel feature compared to those previously studied. Especially, significantly enhanced thermal emission can be achieved in a broad spectral band due to excitation of surface photon polaritons (SPhPs), PC modes, magnetic polaritons (MPs) and the coupling between them. We show that it is possible to flexibly control the thermal emission feature by adjusting the microstructure's dimensional parameters properly.

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Figures

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Fig. 1

Schematic of the proposed structure

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Fig. 2

(a) Comparison of the spectral-normal emissivity of the proposed structure for TE wave with that of two other structures and (b) comparison of the spectral-normal emissivity of the proposed structure for TM wave (solid) with that of SiC grating on one unit cell of PC (dashed) and SiC grating on a bulk dielectric of n = 2.4 (dashed–dotted)

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Fig. 3

Theoretical dispersion curves of SPhPs excited at the interface between SiC and air (solid) and between SiC and a medium of n = 2.4 (dashed)

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Fig. 4

Magnetic field amplitude distribution in the proposed structure showing SPhPs excited at the interface between the SiC layer and the top layer of the PC: (a) ω = 1.561 and (b) ω = 1.632. Insets show the enlarged field amplitude distribution.

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Fig. 5

(a) Magnetic field amplitude distribution in the proposed structure showing PC mode excitation: ω = 1.599 and (b) effect of a2,t on the emissivity peak due to PC mode excitation

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Fig. 6

(a) Magnetic field pattern in the proposed structure showing magnetic polariton excitation: ω = 1.726 and dg = 1μm; (b) emissivity of the proposed structure for TM wave at normal direction as a function of the grating depth: ω = 1.726; (c) magnetic field pattern in the proposed structure showing the second order magnetic polariton excitation: ω = 1.726 and dg = 4.87μm

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Fig. 7

(a) Effect of a2,t on the spectral-normal emissivity of the proposed structure for TM wave and (b) effect of ds on the spectral-normal emissivity of the proposed structure for TM wave

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Fig. 8

Optimized spectral-normal emissivity of the proposed structure for TM-wave by tuning the values of Λ, f, dg, ds, and a2,t in two specified frequency range

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Fig. 9

Contour plot of the emissivity as a function of the angular frequency and the parallel component of wave vector: (a) TE wave and (b) TM wave

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