期刊
JOURNAL OF MODERN OPTICS
卷 64, 期 7, 页码 665-671出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/09500340.2016.1257165
关键词
Metamaterial absorber; Polarization-insensitive; wide angle incidence
类别
资金
- National Natural Science Foundation of China [61275070]
- Shanghai Natural Science Foundation [15ZR1415900]
In this work, a new type of metamaterial absorber is proposed in the infrared region. This structure consists of metal-dielectric-metal. But the difference is that a square groove in the dielectric has been dug, and replaced by a metal. The simulated results show that this structure can achieve a broadband absorption. And the absorption bandwidth can be realized from 60.5 to 115.5 THz when the absorption efficiency is larger than 90%. And this structure is polarization-insensitive for incident electromagnetic waves. In addition, the structure can also achieve better absorption effect for a large incident angle, especially for TM polarized wave. What is more, a remarkably enhanced bandwidth can be realized by using a metal to fill the square groove which is dug in the dielectric. To further explain the mechanism of high absorption, the distribution of the electromagnetic field and power loss density at the resonance frequencies are analysed. And these novel properties make the absorbers have many applications including sensor, cloaking, etc.
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