1. Holloway, C. L., A. Dienstfrey, E. F. Kuester, J. F. O’Hara, A. K. Azad, and A. J. Taylor, "A discussion on the interpretation and characterization of metafilms/metasurfaces: The two-dimensional equivalent of metamaterials," Metamaterials, Vol. 3, 100-112, 2009.
doi:10.1016/j.metmat.2009.08.001        Google Scholar

2. Sun, S., Q. He, S. Xiao, Q. Xu, X. Li, and L. Zhou, "Gradient-index meta-surfaces as a bridge linking propagating waves and surface waves," Nature Materials, Vol. 11, 426-431, 2012.
doi:10.1038/nmat3292        Google Scholar

3. Lin, D., P. Fan, E. Hasman, and M. L. Brongersma, "Dielectric gradient metasurface optical elements," Science, Vol. 345, 298-302, 2014.
doi:10.1126/science.1253213        Google Scholar

4. Zhu, W., I. D. Rukhlenko, Y. Huang, G.Wen, and M. Premaratne, "Wideband giant optical activity and negligible circular dichroism of near-infrared chiral metamaterial based on a complimentary twisted configuration," Journal of Optics, Vol. 15, 125101, 2013.
doi:10.1088/2040-8978/15/12/125101        Google Scholar

5. Kim, T.-T., S. S. Oh, H.-S. Park, R. Zhao, S.-H. Kim, W. Choi, B. Min, and O. Hess, "Optical activity enhanced by strong inter-molecular coupling in planar chiral metamaterials," Scientific Reports, Vol. 4, 5864, 2014.
doi:10.1038/srep05864        Google Scholar

6. Landy, N. I., S. Sajuyigbe, J. J. Mock, D. R. Smith, and W. J. Padilla, "Perfect metamaterial absorber," Phys. Rev. Lett., Vol. 100, 207402, 2008.
doi:10.1103/PhysRevLett.100.207402        Google Scholar

7. Tao, H., C. M. Bingham, A. C. Strikwerda, D. Pilon, D. Shrekenhamer, N. I. Landy, K. Fan, X. Zhang, W. J. Padilla, and R. D. Averitt, "Highly flexible wide angle of incidence terahertz metamaterial absorber: Design, fabrication, and characterization," Phys. Rev. B, Vol. 78, 241103(R), 2008.
doi:10.1103/PhysRevB.78.241103        Google Scholar

8. Watts, C. M., X. liu, and W. J. Padilla, "Metamaterial electromagnetic wave absorbers," Adv. Mater., Vol. 24, OP98-OP120, 2012.        Google Scholar

9. Yoo, Y. J., H. Y. Zheng, Y. J. Kim, J. Y. Rhee, J.-H. Kang, K. M. Kim. H. Cheong, Y. H. Kim, and Y. P. Lee, "Flexible and elastic metamaterial absorber for low frequency, based on small-size unit cell," Appl. Phys. Lett., Vol. 105, No. 4, 041902, 2014.
doi:10.1063/1.4885095        Google Scholar

10. Liu, X., Q. Zhao, C. Lan, and J. Zhou, "Isotropic Mie resonance-based metamaterial perfect absorber," Appl. Phys. Lett., Vol. 103, No. 3, 031910, 2013.
doi:10.1063/1.4813914        Google Scholar

11. El-Aasser, M. A., "Design optimization of nanostrip metamaterial perfect absorbers," Journal of Nanophotonics, Vol. 8, No. 1, 083085, 2014.
doi:10.1117/1.JNP.8.083085        Google Scholar

12. Costa, F., S. Genovesi, A. Monorchio, and G. Manara, "A circuit-based model for the interpretation of perfect metamaterial absorbers," IEEE Trans. Antennas and Propagation, Vol. 61, No. 3, 1201-1209, 2013.
doi:10.1109/TAP.2012.2227923        Google Scholar

13. He, Y., H. Deng, X. Jiao, S. He, J. Gao, and X. Yang, "Infrared perfect absorber based on nanowire metamaterial cavities," Opt. Lett., Vol. 38, No. 7, 1179-1181, 2013.
doi:10.1364/OL.38.001179        Google Scholar

14. Zhong, J., Y. Huang, G. Wen, H. Sun, P. Wang, and O. Gordon, "Single-/dual-band metamaterial absorber based on cross-circular-loop resonator with shorted stubs," Appl. Phys. A, Vol. 108, 329-335, 2012.
doi:10.1007/s00339-012-6989-0        Google Scholar

15. Dincer, F., M. Karaaslan, E. Unal, K. Delihacioglu, and C. Sabah, "Design of polarization and incident angle insensitive dual-band metamaterial absorber based on isotropic resonators," Progress In Electromagnetics Research, Vol. 144, 123-132, 2014.
doi:10.2528/PIER13111403        Google Scholar

16. Wang, G.-D., J.-F. Chen, X. Hu, Z.-Q. Chen, and M. Liu, "Polarization-insensitive triple-band microwave metamaterial absorber based on rotated square rings," Progress In Electromagnetics Research, Vol. 145, 175-183, 2014.
doi:10.2528/PIER14010401        Google Scholar

17. Bhattacharyya, S. and K. V. Srivastava, "Triple band polarization-independent ultra-thin metamaterial absorber using electric field-driven LC resonator," J. Appl. Phys., Vol. 115, 064508, 2014.
doi:10.1063/1.4865273        Google Scholar

18. Li, H., L. H. Yuan, B. Zhou, X. P. Shen, Q. Cheng, and T. J. Cui, "Ultrathin multiband gigahertz metamaterial absorbers," J. Appl. Phys., Vol. 110, 014909, 2011.
doi:10.1063/1.3608246        Google Scholar

19. Tian, Y., G. Wen, and Y. Huang, "Multiband negative permittivity metamaterials and absorbers," Advances in Optoelectronics, Vol. 2013, 269170, 2013.        Google Scholar

20. Zhu, W., Y. Huang, I. D. Rukhlenko, G. Wen, and M. Premaratne, "Configurable metamaterial absorber with pseudo wideband spectrum," Opt. Express, Vol. 20, 6616-6621, 2012.
doi:10.1364/OE.20.006616        Google Scholar

21. Huang, Y., G. Wen, W. Zhu, J. Li, L.-M. Si, and M. Premaratne, "Experimental demonstration of a magnetically tunable ferrite based metamaterial absorber," Opt. Express, Vol. 22, 16408-16417, 2014.
doi:10.1364/OE.22.016408        Google Scholar

22. Li, W., U. Guler, N. Kinsey, G. V. Naik, A. Boltasseva, J. Guan, V. M. Shalaev, and A. V. Kildishev, "Refractory plasmonics with titanium nitride: Broadband metamaterial absorber," Advanced Materials, Vol. 26, No. 47, 7959-7965, 2014.
doi:10.1002/adma.201401874        Google Scholar

23. Li, W., X. Qiao, Y. Luo, F. X. Qin, and H. X. Peng, "Magnetic medium broadband metamaterial absorber based on the coupling resonance mechanism," Appl. Phys. A, Vol. 115, No. 1, 229-234, 2014.
doi:10.1007/s00339-013-7996-5        Google Scholar

24. Cui, Y., K. H. Fung, J. Xu, H. Ma, Y. Jin, S. He, and N. X. Fang, "Ultrabroadband light absorption by a sawtooth anisotropic metamaterial slab," Nano Lett., Vol. 12, 1443-1447, 2012.
doi:10.1021/nl204118h        Google Scholar

25. Zhu, J., Z. Ma, W. Sun, F. Ding, Q. He, L. Zhou, and Y. Ma, "Ultra-broadband terahertz metamaterial absorber," Appl. Phys. Lett., Vol. 105, No. 2, 021102, 2014.
doi:10.1063/1.4890521        Google Scholar

26. Wanghuang, T., W. Chen, Y. Huang, and G. Wen, "Analysis of metamaterial absorber in normal and oblique incidence by using interference theory," AIP Adv., Vol. 3, 102118, 2013.
doi:10.1063/1.4826522        Google Scholar

27. Pang, Y., H. Cheng, Y. Zhou, and J. Wang, "Analysis and design of wire-based metamaterial absorbers using equivalent circuit approach," J. Appl. Phys., Vol. 113, 114902, 2013.
doi:10.1063/1.4795277        Google Scholar

28. Cao, Z. X., F. G. Yuan, and L. H. Li, "A super-compact metamaterial absorber cell in L-band," J. Appl. Phys., Vol. 115, 184904, 2014.
doi:10.1063/1.4875835        Google Scholar

29. Lin, B.-Q., X.-Y. Da, S.-H. Zhao, W. Meng, F. Li, Q.-R. Zheng, and B. H. Wang, "Low frequency ultra-thin compact metamaterial absorber comprising split-ping resonators," Chin. Phys. Lett., Vol. 31, 067801, 2014.
doi:10.1088/0256-307X/31/6/067801        Google Scholar

30. Huang, Y. J., G. J. Wen, J. Li, J. P. Zhong, P. Wang, Y. H. Sun, O. Gordon, and W. R. Zhu, "Metamaterial absorbers realized in X-band rectangular waveguide," Chin. Phys. B, Vol. 21, 117801, 2012.        Google Scholar

31. Padilla, W. J., M. T. Aronsson, C. Highstrete, M. Lee, A. J. Taylor, and R. D. Averitt, "Electrically resonant terahertz metamaterials: Theoretical and experimental investigations," Phys. Rev. B, Vol. 75, 041102, 2007.
doi:10.1103/PhysRevB.75.041102        Google Scholar

32. Kolb, P. W., T. S. Salter, J. A. McGee, H. D. Drew, and W. J. Paddilla, "Extreme subwavelength electric GHz metamaterials," J. Appl. Phys., Vol. 110, 054906, 2011.
doi:10.1063/1.3633213        Google Scholar

33. Chen, W.-C., C. M. Bingham, K. M. Mak, N. W. Caira, and W. J. Paddilla, "Extremely subwavelength planar magnetic metamaterials," Phys. Rev. B, Vol. 85, 201104, 2012.
doi:10.1103/PhysRevB.85.201104        Google Scholar

34. Zhu, W. and X. Zhao, "Numerical study of low-loss cross left-handed metamaterials at visible frequency," Chin. Phys. Lett., Vol. 26, 074212, 2009.        Google Scholar