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本文设计了一种超薄螺旋结构超材料吸波体,其厚度(1.034 mm)约为其工作波长(4.81 GHz,6.59 GHz,9.16 GHz,12.69 GHz和13.71 GHz)的(1/60,1/44,1/32,1/23,1/21). 仿真和实验结果表明,该吸波体在4.81 GHz,6.59 GHz,9.16 GHz,12.69 GHz和13.71 GHz处吸收率分别达到94.55%、99.89%、99.73%、99.26% 和99.41%,实现了多频带强吸收. 从表面电流和功率损耗密度两个方面分析了产生强吸收的原因,理论分析表明,多频带强吸收能在五个相邻频率处产生多阶局域表面等离激元谐振,螺旋结构之间强烈的电谐振使超材料结构单元产生强烈的吸收. 该超材料吸波体设计简单、易于制作和应用,在电磁波吸收中具有应用价值.In this paper, an ultra-thinspiral-structured metamaterial absorber is demonstrated both numerically and experimentally, whose thickness (1.034 mm) is about (1/60th, 1/44th, 1/32th, 1/23th, 1/21th) of the respective working wavelengths (4.81, 6.59, 9.16, 12.69 and 13.71 GHz). Simulation results show that the absorber can achieve absorption up to 94.41%, 99.89%, 99.73%, 99.26% and 99.41% at 4.81, 6.59, 9.16, 12.69 and 13.71 GHz respectively. Thus multi-band absorptions are realized. From the two aspects of surface current and power loss density, the mechanism of strong absorption is analyzed. Theoretical analysis shows that the multi-band absorption arises from multi-order plasmon resonances at five neighboring frequencies. Strong absorptions are induced due to strong electric resonances within/between the spiral structures. Design of the metamaterial absorber is simple and is easy to be implemented, so such absorbers may have application values in designing novel electromagnetic absorbers.
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Keywords:
- multi-band /
- metamaterial absorber /
- spiral structure /
- plasmon resonance
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[1] Ari Sihvola. Metamaterials in electromagnetics 2007 Metamaterials 1 2
[2] [3] Smith D R, Vier D C, Willie Padilla, Syrus C, Nemat-Nasser, Schultz S 1999 Appl. Phys. Lett. 75 1425
[4] [5] Cui W Z, Ma W, Qiu L D, Zhang H T 2010 Electromagnetic Metamaterials and its Application (Beijing: National Defence Industry Press) p1 (in Chinese)[崔万照, 马伟, 邱乐德, 张洪太2010电磁超介质及其应用(北京: 国防工业出版社)第1页]
[6] [7] Landy N I, Sajuyigbe S, Mock J J, Smith D R, Padilla W J 2008 Phys. Rev. Lett. 100 207402
[8] [9] Wen Q Y, Zhang H W, Xie Y S, Yang Q H, Liu Y L 2009 Appl. Phys. Lerr. 101 24111
[10] [11] Shen X P, Yang Y, Zang Y Z, Han J G, Zhang W L, Cui T J 2012 Appl. Phys. Lerr. 101 154102
[12] Zhu W R, Zhao X P, Gong B Y, Liu L H 2011 Appl. Phys. A 102 147
[13] [14] [15] Hu C G, Zhao Z Y, Chen X N, Luo X G 2009 Opt. Express 17 11039
[16] [17] Sun J B, Liu L Y, Dong G Y, Zhou J 2011 Opt. Express 22 21155
[18] [19] Lu L, Qu S B, Shi H Y, Zhang A X, Xia S, Xu Z, Zhang J Q 2014 Acta Phys. Sin. 63 2 (in Chinese)[鲁磊, 屈绍波, 施宏宇, 张安学, 夏颂, 徐卓, 张介秋 2014 物理学报 63 2]
[20] Chen S, Cheng H, Yang H, Li J, Duan X, Gu C, Tian J 2011 Appl. Phys. Lett. 99 253104
[21] [22] [23] Gu C, Qu S B, Pei Z B, Xu Z, Lin B Q, Zhou H, Bai P, Gu W, Peng W D, Ma H 2011 Acta Phys. Sin. 60 8 (in Chinese)[顾超, 屈绍波, 裴志斌, 徐卓, 林宝勤, 周航, 柏鹏, 顾巍, 彭卫东, 马华 2011 物理学报 60 8]
[24] Gu C, Qu S B, Pei Z B, Xu Z, Bai P, Peng W D, Lin B Q 2011 Acta Phys. Sin. 60 8 (in Chinese)[顾超, 屈绍波, 裴志斌, 徐卓, 柏鹏, 彭卫东, 林宝勤 2011 物理学报 60 8])
[25] [26] Sun L K Cheng H F, Zhou Y J Wang J 2012 Chin. Phys. B 21 055201
[27] [28] Mo M M, Wen Q Y, Chen Z, Yang Q H, Qiu D H, Li S, Jing Y L, Zhang H W Yang Q H, Qiu D H, Li S, Jing Y L, Zhang H W 2014 Chin. Phys. B 23 4
[29] [30] [31] Fan Y N, Cheng Y Z, Nie Y, Wang X, Gong R Z 2013 Chin. Phys. B 22 067801
[32] [33] Cheng Y Z, Gong R Z, Nie Y, Wang X 2012 Chin. Phys. B 21 127801
[34] Nie Y, Cheng Y Z, Gong R Z 2013 Chin. Phys. B 22 044102
[35] [36] Ma Y, Chen Q, Grant J, Shimul C, Saha, Khalid A, David R S 2011 Optics Letters. 3 6
[37] [38] Shen X P, Cui T J, Ye J X 2012 Acta phys. Sin. 61 058101 (in Chinese)[沈晓鹏, 崔铁军, 叶建祥 2012 物理学报 61 058101]
[39] [40] [41] Li L, Yang Y, Liang C H 2011 J. Appl. Phys. 110 063702
[42] [43] Zhong J P, Huang Y J, Wen G J, Sun H B, Wang P, Gordon O 2012 Appl. Phys. A 108 329
[44] [45] Ye Q W, Liu Y, Lin H, Li M H, Yang H L 2012 Appl. Phys. A 107 155
[46] [47] Wang G D, Liu M H, Hu X W, Kong L H, Cheng L L, Chen Z Q 2014 Chin. Phys. B 23 1
[48] [49] Chen C, Wu S, Yen T 2008 Appl. Phys. Lett. 93 34110
[50] [51] Bahl I, Bhartia P 2003 Wiley New Jersey
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