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Based on the electromagnetic resonant characteristic of the metallic dendritic cells, we present a metamaterial absorber (MA) composed of periodic array of double dendritic cells. The unit cell of the absorber is composed of two metallic elements on the substrate, a two-level dendritic cell and a three-level dendritic cell are located on each side separately. Designing different impedance matching conditions, the effect of impedance matching on the absorptivity is found. The experimental results show that a maximum absorptivity of 90% can only occur when the MA layer is impedance-matched to free space. At the same time, increasing the number of MA layers can effectively enhance the absorptivity. For 3 layers, the absorptivity above 99% can be obtained, that is to say, a perfect MA is realized in the engineering sense.
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Keywords:
- dendritic structure /
- impedance matching /
- absorption
[1] Veselago V G 1968 Sov. Phys. Usp. 10 509
[2] Shelby R A, Smith D R, Schultz S 2001 Science 292 77
[3] Pendry J B 2000 Phys. Rev. Lett. 85 3966
[4] Smith D R, Pendry J B 2006 J. Opt. Soc. Am. B 23 391
[5] 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]
[6] Zhang F L, Zhao Q, Liu Y H, Luo C R, Zhao X P 2004 Chin. Phys. Lett. 21 1330
[7] Zhao X P, Zhao Q, Kang L, Song J, Fu Q H 2005 Phys. Lett. A 346 87
[8] 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]
[9] Zhou J F, Economon E N, Koschny T, Soukoulis C M 2006 Opt. Lett. 31 3620
[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] Shalaev V M 2007 Nat. Photonics 1 41
[13] Schurig D, Mock J J, Justice B J, Cummer S A, Pendry J B, Starr A F, Smith D R 2006 Science 314 977
[14] Landy N I, Sajuyigbe S, Mock J J, Smith D R, Padilla W J 2008 Phys. Rev. Lett. 100 207402
[15] Liu H, Zhao X P, Yang Y, Li Q W, Lv J 2008 Adv. Mater. 20 2050
[16] Markos P, Soukoulis C M 2002 Phys. Rev. E 65 036622
[17] Smith D R, Schultz S, Markos P, Soukoulis C M 2002 Phys. Rev. B 65 195104
[18] Chen X D, Wu B I, Kong J A, Grzegorczyk T M 2005 Phys. Rev. E 71 046610
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[1] Veselago V G 1968 Sov. Phys. Usp. 10 509
[2] Shelby R A, Smith D R, Schultz S 2001 Science 292 77
[3] Pendry J B 2000 Phys. Rev. Lett. 85 3966
[4] Smith D R, Pendry J B 2006 J. Opt. Soc. Am. B 23 391
[5] 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]
[6] Zhang F L, Zhao Q, Liu Y H, Luo C R, Zhao X P 2004 Chin. Phys. Lett. 21 1330
[7] Zhao X P, Zhao Q, Kang L, Song J, Fu Q H 2005 Phys. Lett. A 346 87
[8] 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]
[9] Zhou J F, Economon E N, Koschny T, Soukoulis C M 2006 Opt. Lett. 31 3620
[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] Shalaev V M 2007 Nat. Photonics 1 41
[13] Schurig D, Mock J J, Justice B J, Cummer S A, Pendry J B, Starr A F, Smith D R 2006 Science 314 977
[14] Landy N I, Sajuyigbe S, Mock J J, Smith D R, Padilla W J 2008 Phys. Rev. Lett. 100 207402
[15] Liu H, Zhao X P, Yang Y, Li Q W, Lv J 2008 Adv. Mater. 20 2050
[16] Markos P, Soukoulis C M 2002 Phys. Rev. E 65 036622
[17] Smith D R, Schultz S, Markos P, Soukoulis C M 2002 Phys. Rev. B 65 195104
[18] Chen X D, Wu B I, Kong J A, Grzegorczyk T M 2005 Phys. Rev. E 71 046610
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