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Technical Brief

Infrared Absorption Characteristics Analysis for Annulus Nanostructure of Aluminum Substrate

[+] Author and Article Information
Qing Hui Pan, Xiang Chen, Sheng Duo Xu, He Ping Tan

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China

Yong Shuai

School of Energy Science and Engineering,
Harbin Institute of Technology,
Harbin 150001, China
e-mail: shuaiyong@hit.edu.cn

1Corresponding author.

Presented at the 2016 ASME 5th Micro/Nanoscale Heat & Mass Transfer International Conference. Paper No. MNHMT2016-6551.Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 31, 2016; final manuscript received November 3, 2016; published online February 14, 2017. Assoc. Editor: Zhuomin Zhang.

J. Heat Transfer 139(5), 054502 (Feb 14, 2017) (4 pages) Paper No: HT-16-1339; doi: 10.1115/1.4035250 History: Received May 31, 2016; Revised November 03, 2016

An annulus-shaped nanostructure having a three-layer structure consisting of an annulus aluminum pattern, Al2O3 spacer layer, and Al substrate is presented. High absorption peaks can be easily obtained between 2.5 μm and 12.5 μm in the case of a uniform plane wave at normal incidence. A unilateral annulus structure is designed to obtain an absorption peak of almost 100% by optimal geometry parameters. Moreover, a double annulus consisting of two unilateral annuli is proposed to compare their performances. The results indicate that the double annulus inherit the single one's absorption characteristics, and that the outer loop coupling with the inner one enhances the absorption peak of the inner loop. This structure provides a great potential for application in designing selective thermal emitters, biosensing, etc.

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Figures

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Fig. 1

Diagram of the numerical model for annulus. (a) Illustration the structure of double annuluses and (b) part view of the structure showing different metal, dielectric and substrate.

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Fig. 2

Comparing the absorptivity with different structure parameters

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Fig. 3

The electromagnetic fields and current density distribution for unilateral annulus absorber. (a) λ = 6.6 μm, xy-slice and (b) xz-slice.

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Fig. 5

Absorption of difference annulus

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Fig. 6

Electromagnetic distribution of different absorption peaks position. (a) λ = 3.2 μm, xy-slice, xz-slice and (b) λ = 6.6 μm, xy-slice, xz-slice.

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