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Research Papers

Thermal Radiative Properties of a Two-Dimensional Silicon Carbide Grating Mediated With a Photonic Crystal

[+] Author and Article Information
Weijie Wang

LTCS and Department of Mechanics and
Engineering Science,
College of Engineering Peking University,
Beijing 100871, China;
Institute of Applied Physics and
Computational Mathematics,
Beijing 100088, China

Yi Zhao, Wenchang Tan

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

Ceji Fu

LTCS and Department of Mechanics and
Engineering Science,
College of Engineering Peking University,
Beijing 100871, China
e-mail: cjfu@pku.edu.cn

1Corresponding author.

Manuscript received May 3, 2014; final manuscript received February 14, 2015; published online May 14, 2015. Assoc. Editor: L. Q. Wang.

J. Heat Transfer 137(9), 091022 (Sep 01, 2015) (6 pages) Paper No: HT-14-1288; doi: 10.1115/1.4030238 History: Received May 03, 2014; Revised February 14, 2015; Online May 14, 2015

We present in this paper numerical simulation results of the thermal radiative properties of a two-dimensional (2D) rectangular SiC grating atop a photonic crystal (PC). The results show that surface phonon polaritons (SPhPs) can be excited by both TE and TM waves when they are scattered by the 2D grating. Excitation of SPhPs, PC modes, and magnetic polaritons (MPs), and interactions between them give rise to great enhancement of the emissivity. Distinct effects of the grating geometry on the resonance of SPhPs, PC modes, and MPs were revealed, which suggest a way to effectively manipulate the emissivity by tuning the structure's geometry. Furthermore, the results indicate that quasi-diffuse emissivity of the structure can be obtained for both TE and TM waves.

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Figures

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Fig. 1

Schematic view of the 2D grating/PC structure

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Fig. 2

Theoretical dispersion curves of SPhPs excited with a 2D grating for (a) p-polarization (the incident electric field (E0||x∧, TM wave) and (b) s-polarization (E0||y∧, TE wave)

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Fig. 7

Variation of the spectral emissivity with the azimuthal angle φ at emission angle θ = 30 deg and 45 deg: (a) and (b) p-polarization, (c) and (d) s-polarization

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Fig. 6

Calculated spectral emissivity of the proposed structure at different emission angles and φ = 0: (a) p-polarization and (b) s-polarization

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Fig. 5

(a) Effect of the grating periods Λg,x and Λg,y on the spectral-normal emissivity of the structure for p-polarization; (b) effect of the grating depth dg on the spectral-normal emissivity of the structure

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Fig. 4

(a)–(c) Magnetic field patterns in the x–y plane at z = -1.25μm for ω = 1.560, 1.582, and 1.600, respectively; (d) same as (c) but in the y–z plane at x = 3.75μm; (e) magnetic field pattern in the x–z plane at y = 1.25μm for ω = 1.690. The grating borders are marked for ease of reading.

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Fig. 3

Calculated spectral-normal emissivity curves of the proposed structure (solid lines), the structure with fy = 1 (dashed and dashed–dotted lines) and a bare SiC film (dotted lines)

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