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We present a metamaterial absorber (MA) composed of double layers of metal dendritic cells,dielectric substrate and metal film.With three different sizes of dendritic cells arranging in hexagonal array,it is able to find three discrete absorption peaks.Our experiments confirm that,if the frequencies of the three absorption peaks go closer,a combined broadband absorption peak could be achieved.Compared with the metamaterial absorber with only one singer layer of metal dendritic cells,the double-layered metal dendritic cells adopted in our MA greatly improve the absorption efficiency.The experimental result shows an absorption band of 1.93 GHz width with the absorptivity higher than 90% in the frequency range between 9.79 and 11.72 GHz.The proposed MA has a series of advantages such as high absorptivity,simple structure,small thickness,2D isotropy and wide absorption band.
[1] ［1］Shelby R A, Smith D R, Schultz S 2001 Science 292 77
[2] ［2］Smith D R, Pendry J B 2006 J. Opt. Soc. Am. B 23 391
[3] ［3］Pendry J B, Schurig D, Smith D R 2006 Science 312 1780
[4] ［4］Schurig D, Mock J J, Justice B J, Cummer S A, Pendry J B, Starr A F, Smith D R 2006 Science 314 977
[5] ［5］Landy N I, Sajuyigbe S, Mock J J, Smith D R, Padilla W J 2008 Phys. Rev. Lett. 100 207402
[6] ［6］Zhao Q, Zhao X P, Kang L, Zhang F L, Liu Y H, Luo C R 2004 Acta Phys. Sin. 53 2206 (in Chinese) ［赵乾、赵晓鹏、康雷、张富利、刘亚红、罗春荣 2004 53 2206］
[7] ［7］Zhang F L, Zhao Q, Liu Y H, Luo C R, Zhao X P 2004 Chin. Phys. Lett. 21 1330
[8] ［8］Zhao X P, Zhao Q, Kang L, Song J, Fu Q H 2005 Phys. Lett. A 346 87
[9] ［9］Luo C R, Kang L, Zhao Q, Fu Q H, Song J, Zhao X P 2005 Acta Phys. Sin. 54 1607 (in Chinese) ［罗春荣、康雷、赵乾、付全红、宋娟、赵晓鹏 2005 54 1607］
[10] ］Zhou X, Fu Q H, Zhao J, Yang Y, Zhao X P 2006 Opt. Express. 14 7188
[11] ］Zhu W R, Zhao X P, Guo J Q 2008 Appl. Phys. Lett. 92 241116
[12] ］Zhou X, Zhao X P 2007 Appl. Phys. Lett. 91 181908
[13] ］Guo J Q, Luo C R, Zhao X P 2009 Chin. Phys. Lett. 26 044102
[14] ］Luo C R, Wang S H, Guo J Q, Huang Y, Zhao X P 2009 Acta Phys. Sin. 58 3124 (in Chinese) ［罗春荣、王连胜、郭继权、黄勇、赵晓鹏 2009 58 3124］
[15] ］Liu H, Zhao X P, Yang Y, Li Q W, Lv J 2008 Adv. Mater. 20 2050
[16] ］Liu B Q, Zhao X P, Zhu W R, Luo W, Cheng X C 2008 Adv. Funct. Mater. 18 3523
[17] ］Christopher M B, Tao H, Liu X L, Richard D A, Zhang X, Padilla W J 2008 Opt. Express. 16 18565
[18] ］Munk B A, Pryor J B, Gan Y B 2004 Electromagnetic Materials Proc. of the Symposium F 2003 (Singapore:World Scientific Publishing Company) p977
[19] ］Zhou J, Zhang L, Tuttle G, Koschny T, Soukoulis C M 2006 Phys. Rev. B 73 041101
[20] ］Kafesaki M, Tsiapa I, Katsarakis N, Koschny T, Soukoulis C M, Economou E N 2007 Phys. Rev. B 75 235114
[21] ］Landy N I, Bingham C M, Tyler T, Jokerst N, Smith D R, Padilla W J 2009 Phys. Rev. B 79 125104
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[1] ［1］Shelby R A, Smith D R, Schultz S 2001 Science 292 77
[2] ［2］Smith D R, Pendry J B 2006 J. Opt. Soc. Am. B 23 391
[3] ［3］Pendry J B, Schurig D, Smith D R 2006 Science 312 1780
[4] ［4］Schurig D, Mock J J, Justice B J, Cummer S A, Pendry J B, Starr A F, Smith D R 2006 Science 314 977
[5] ［5］Landy N I, Sajuyigbe S, Mock J J, Smith D R, Padilla W J 2008 Phys. Rev. Lett. 100 207402
[6] ［6］Zhao Q, Zhao X P, Kang L, Zhang F L, Liu Y H, Luo C R 2004 Acta Phys. Sin. 53 2206 (in Chinese) ［赵乾、赵晓鹏、康雷、张富利、刘亚红、罗春荣 2004 53 2206］
[7] ［7］Zhang F L, Zhao Q, Liu Y H, Luo C R, Zhao X P 2004 Chin. Phys. Lett. 21 1330
[8] ［8］Zhao X P, Zhao Q, Kang L, Song J, Fu Q H 2005 Phys. Lett. A 346 87
[9] ［9］Luo C R, Kang L, Zhao Q, Fu Q H, Song J, Zhao X P 2005 Acta Phys. Sin. 54 1607 (in Chinese) ［罗春荣、康雷、赵乾、付全红、宋娟、赵晓鹏 2005 54 1607］
[10] ］Zhou X, Fu Q H, Zhao J, Yang Y, Zhao X P 2006 Opt. Express. 14 7188
[11] ］Zhu W R, Zhao X P, Guo J Q 2008 Appl. Phys. Lett. 92 241116
[12] ］Zhou X, Zhao X P 2007 Appl. Phys. Lett. 91 181908
[13] ］Guo J Q, Luo C R, Zhao X P 2009 Chin. Phys. Lett. 26 044102
[14] ］Luo C R, Wang S H, Guo J Q, Huang Y, Zhao X P 2009 Acta Phys. Sin. 58 3124 (in Chinese) ［罗春荣、王连胜、郭继权、黄勇、赵晓鹏 2009 58 3124］
[15] ］Liu H, Zhao X P, Yang Y, Li Q W, Lv J 2008 Adv. Mater. 20 2050
[16] ］Liu B Q, Zhao X P, Zhu W R, Luo W, Cheng X C 2008 Adv. Funct. Mater. 18 3523
[17] ］Christopher M B, Tao H, Liu X L, Richard D A, Zhang X, Padilla W J 2008 Opt. Express. 16 18565
[18] ］Munk B A, Pryor J B, Gan Y B 2004 Electromagnetic Materials Proc. of the Symposium F 2003 (Singapore:World Scientific Publishing Company) p977
[19] ］Zhou J, Zhang L, Tuttle G, Koschny T, Soukoulis C M 2006 Phys. Rev. B 73 041101
[20] ］Kafesaki M, Tsiapa I, Katsarakis N, Koschny T, Soukoulis C M, Economou E N 2007 Phys. Rev. B 75 235114
[21] ］Landy N I, Bingham C M, Tyler T, Jokerst N, Smith D R, Padilla W J 2009 Phys. Rev. B 79 125104
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