CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Thermal emission properties of one-dimensional grating with different parameters |
Weixin Lin(林伟新)1, Guozhou Li(李国洲)1, Qiang Li(李强)2, Hongjin Hu(胡宏锦)1, Fang Han(韩防)1, Fanwei Zhang(张樊伟)1, Lijun Wu(吴立军)1 |
1 Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devics, School of Information and Optoelectronic Science and Engineering, South China Normal University, Guangzhou 510006, China;
2 Department of Physics, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China |
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Abstract Thermal emission is often presented as a typical incoherent process. Incorporating periodic structures on the tungsten surface offers the possibility to obtain coherent thermal emission sources. Here we illustrate grating as an example to examine the influence of the geometric parameters on the thermal emission properties. It is found that for very shallow gratings, only surface plasmon polariton (SPP) modes can be excited and the emission efficiency is closely related with the filling factor. When the ratio of the depth to period of the grating is in the range from 1/20 to 1/2, the field between the adjacent corners can be coupled to each other across the air gap for the filling factor larger than 0.5 and produce a similar resonance as in an air rod. Further increase of the grating depth can cause the groove of the grating forming metal-insulator-metal (MIM) structures and induce surface plasmon standing wave modes. Our investigations will not only be helpful for manipulating thermal emission properties according to applications, but also help us understand the coupling mechanism between the incident electromagnetism waves and gratings with different parameters in various research fields.
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Received: 07 November 2016
Revised: 16 December 2016
Accepted manuscript online:
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PACS:
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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44.40.+a
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(Thermal radiation)
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41.50.+h
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(X-ray beams and x-ray optics)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61378082 and 61675070) and the Project of High-level Professionals in the Universities of Guangdong Province, China. |
Corresponding Authors:
Lijun Wu
E-mail: ljwu@scnu.edu.cn
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Cite this article:
Weixin Lin(林伟新), Guozhou Li(李国洲), Qiang Li(李强), Hongjin Hu(胡宏锦), Fang Han(韩防), Fanwei Zhang(张樊伟), Lijun Wu(吴立军) Thermal emission properties of one-dimensional grating with different parameters 2017 Chin. Phys. B 26 057301
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