Skip Navigation
Oklahoma State University
Research Week

Home of World Class Research

Ultra-high refractive index in deep subwavelength coupled bi-layer free-standing flexible metamaterials

Ultra-high refractive index in deep subwavelength coupled bi-layer free-standing flexible metamaterials

Name:
Leena Singh

Department:
Electrical & Computer Engineering

Abstract:
IN A SENSE, every material is a composite, even if the individual ingredients consist of atoms and molecules.[1] These natural atoms when replaced with artificially designed unit cell structures (meta-atoms), result in an engineered material that is now well known as metamaterials. Metamaterial properties are derived from their meta-atoms rather than their composition. These sub-wavelength meta-atoms can be designed with unique shapes and sizes, and wit-fully arranged and oriented to achieve unconventional values of permeability[2] and permittivity[3], the characteristic electromagnetic properties of any material medium. By tailoring the electric and magnetic response of the material towards incident electromagnetic waves, the effective refractive index can be varied from negative[4-8] to zero[9-12], or even to higher positive values[13-19]. Metamaterials have created a completely new dimension to engineered materials. This has offered an opportunity to build new devices with exotic functionalities.[20] Metamaterials are proven to be especially valuable in the terahertz regime, where most naturally existing materials exhibit weak electromagnetic wave response.[21]

References: [1] J. B. Pendry, A. J. Holden, D. Robbins and W. Stewart, IEEE T. Microw. Theory 1999, 47, 11. [2] T.-J. Yen, W. Padilla, N. Fang, D. Vier, D. Smith, J. Pendry, D. Basov and X. Zhang, Science 2004, 303, 5663. [3] D. Schurig, J. Mock and D. Smith, Appl. Phys. Lett. 2006, 88, 4. [4] D. R. Smith, J. B. Pendry and M. C. Wiltshire, Science 2004, 305, 5685. [5] R. A. Shelby, D. R. Smith and S. Schultz, Science 2001, 292, 5514. [6] D. R. Smith, W. J. Padilla, D. C. Vier, S. C. Nemat-Nasser, and S. Schultz, Phys. Rev. Lett. 2000, 84, 4184. [7] J. B. Pendry, A. Holden, W. Stewart, and I. Youngs, Phys. Rev. Lett. 1996, 76, 4773. [8] J. B. Pendry, A. Holden, D. D. Robbins, and W. Stewart, IEEE Trans. Microwave Theory Tech. 1999, 47, 2075. [9] R. W. Ziolkowski, Phy. Rev. E 2004, 70, 4. [10] A. Alù, M. G. Silveirinha, A. Salandrino and N. Engheta, Phy. Rev. B 2007, 75, 15. [11] S. Enoch, G. Tayeb, P. Sabouroux, N. Guérin and P. Vincent, Phy. Rev. Lett. 2002, 89, 21. [12] M. Silveirinha and N. Engheta, Phy. Rev. Lett. 2006, 97, 15. [13] Z. Lu, B. Camps-Raga and N. Islam, Phys. Res. Intl. 2012, 2012. [14] S. Tan, F. Yan, L. Singh, W. Cao, N. Xu, X. Hu, R. Singh, M. Wang and W. Zhang, Optics express 2015, 23, 22. [15] J. Shin, J.-T. Shen and S. Fan, Physical Review Letters 2009, 102, 9. [16] M. Choi, S. H. Lee, Y. Kim, S. B. Kang, J. Shin, M. H. Kwak, K.-Y. Kang, Y.-H. Lee, N. Park and B. Min, Nature 2011, 470, 7334. [17] C. Enkrich, M. Wegener, S. Linden, S. Burger, L. Zschiedrich, F. Schmidt, J. Zhou, T. Koschny and C. Soukoulis, Phy. Rev. Lett. 2005, 95, 20. [18] D. Sievenpiper, E. Yablonovitch, J. Winn, S. Fan, P. Villeneuve and J. Joannopoulos, Phy. Rev. Lett. 1998, 80, 13. [19] J.-T. Shen, P. B. Catrysse and S. Fan, Phy. Rev. Lett. 2005, 94, 19. [20] H. T. Chen, J. F. O'Hara, A. K. Azad and A. J. Taylor, Laser & Photonics Reviews 2011, 5, 4. [21] C. Sirtori, Nature 2002, 417, 6885.