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Radiative Heat Transfer

Spectral Features of an Omnidirectional Narrowband Emitter

[+] Author and Article Information
Yutao Zhang

School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, China

Yimin Xuan1

School of Energy and Power Engineering, Nanjing University of Science & Technology, Nanjing 210094, Chinaymxuan@mail.njust.edu.cn

1

Corresponding author.

J. Heat Transfer 134(10), 102701 (Aug 07, 2012) (7 pages) doi:10.1115/1.4006156 History: Received March 23, 2011; Revised January 12, 2012; Published August 06, 2012; Online August 07, 2012

A microscale-structured surface consisting of heavily doped silicon rectangle grating and slotted silver layer is studied for omnidirectional narrowband emitter. Numerical simulation is implemented to obtain spectral emittance in mid-infrared region (6–16 μm) for the transverse magnetic incidence by using the rigorous coupled-wave analysis (RCWA) method. The effects of structural parameters and incident angle on its spectral emittance are investigated. In virtue of the microcavity effect, an omnidirectional narrowband emitter is proposed. By selecting a group of structural parameters, its peak emittance reaches as high as 0.998, and the peak width Δλ/λ of the emittance peak is as narrow as 0.03 at the specified wavelength. The results reveal that our proposed structured surface has the nice spectral features of angular uniformity and wavelength-selective characteristic, which can be applied to design novel narrowband thermal emitters and detectors in the infrared region.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic diagram of the proposed emitter (not scaled). (a) Surface structure. (b) Cross section of the proposed structured surface in y-direction and the orientation relationship between the incident wave and interface.

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Figure 2

Comparison of the calculated results (curves) with the published results (markers)

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Figure 3

Spectral absorption of simple P-doped grating with different doping concentrations at different incident angles for TM wave. The geometric parameters are Λ = 7 μm, d1 = 1 μm, f1 = 0.8, d2 = 0.1 μm.

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Figure 4

Spectral absorption of deep simple gratings with different P-doping concentration at different incident angles. Λ = 4.5 μm, d1 = 5.4 μm, d2 = 0.1 μm, f1 = 0.8.

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Figure 5

Comparison between spectral absorptions of the structured surface with upper silver grating layer and deep simple doped silicon grating at different incident angle. Λ = 4.5 μm, d1 = 5.4 μm, d2 = 0.1 μm, d3 = 0.1 μm, f1 = 0.8, f2 = 0.95.

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Figure 6

Contour plots for the absorption of the structured surface as a function of wavelength and filling ratio of the lower grating at normal incidence. Λ = 4.5 μm, d1 = 5.4 μm, d2 = 0.1 μm, d3 = 0.1 μm, f2 = 0.95.

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Figure 7

Energy density and Poynting vector distribution with Np=1×1021cm-3. (a) Energy density distribution. (b) Poynting vector distribution. Λ = 4.5 μm, d1 = 5.4 μm, d2 = 0.1 μm, d3 = 0.1 μm, f1 = 0.05, f2 = 0.95.

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Figure 8

Variation of absorption of complex grating with the lower grating made of different materials with the incident angle and wavelength for TM waves. The structured surface with the lower (a) doped silicon grating and (b) silver grating layer. (c) Variation of absorption of the structured surface with the lower grating made of silver and doped silicon with the incident angle denoted by solid line and dotted solid line at wavelength of 10.45 μm and 10.65 μm corresponding to absorption peak at normal incidence, respectively. Λ = 4.5 μm, d1 = 5.4 μm, d2 = 0.1 μm, d3 = 0.1 μm, f1 = 0.05, f2 = 0.95.

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Figure 9

Absorption of the structured surface with different periods at normal incidence.d1 = 5.4 μm, d2 = 0.1 μm, d3 = 0.1 μm, f1 = 0.05, f2 = 0.95.

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Figure 10

Variation in the absorption spectrum of the structured surface versus d1. The solid line, circle dotted line, and triangle dotted line denote the absorption spectral with the parameter d1 = 3.6, 5.4, and 7.2 μm at normal incidence, respectively. Λ = 4.5 μm, d2 = 0.1 μm, d3 = 0.1 μm, f1 = 0.05, f2 = 0.95.

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