Polarization-independent Metamaterial with Unnaturally High Refractive Index in the Terahertz Region

Zhengxian Liu; Shumin Xiao
August 2014
PIERS Proceedings;Aug2014, p1236
Academic Journal
Refractive index is the most important property of material in optics and most naturally existing transparent materials possess small positive indices of refraction. With the progress of metamaterials, we can manipulate the electromagnetic properties of materials. Meta-materials promise unexpected physical phenomena through creating artificial "atoms" with an array of period metallic structure. However most researches are focusing on the negative refractive index materials at present, on the contrary the opposite side of high refractive index materials attracts far less attention. Previous approaches using metamaterials were not successful in realizing broadband isotropy high refractive indices. Here we design a broadband, isotropy three-dimensional metamaterial with extremely high index of refraction in terahertz region which composed of strongly coupled unit cells. We increase the effective permittivity through strong capacitive coupling and decrease the diamagnetic response with a thin metallic structure in the unit cell. A peak refractive index of 67.9 at 2.14THz is observed under TE mode and a peak refractive index of 66.9 at 2.16THz under TM mode. Both of polarizations maintain low loss with figure of merit go to as high as 2.12 and 2.48 separately. Moreover, the refractive index does not fall sharply at higher frequencies, and shows an extremely broadband behavior with a full-width at half-maximum (FWHM) of more than 2THz.


Related Articles

  • Flexible chiral metamaterials with dynamically optical activity and high negative refractive index. Dincer, Furkan; Karaaslan, Muharrem; Unal, Emin; Akgol, Oguzhan; Sabah, Cumali // Modern Physics Letters B;Jul2015, Vol. 29 Issue 18, p1 

    We demonstrate numerically and experimentally chiral metamaterials (MTMs) based on gammadion-bilayer cross-wires that uniaxially create giant optical activity and tunable circular dichroism as a result of the dynamic design. In addition, the suggested structure gives high negative refractive...

  • Electromagnetics: from Covariance to Cloaking. McCall, M. W. // AIP Conference Proceedings;10/30/2008, Vol. 1067 Issue 1, p48 

    An overview of some topical themes in electromagnetism is presented. Recent interest in metamaterials research has enabled earlier theoretical speculations concerning electromagnetic media displaying a negative refractive index to be experimentally realized. Such media can act as perfect lenses....

  • Chiral metamaterial with unit negative refraction index. I. V. Semchenko; S. A. Khakhomov; S. A. Tretyakov // European Physical Journal - Applied Physics;Jul2008, Vol. 46 Issue 6, p0 

    In this article we study helical inclusions of a certain shape (called the “optimal shape”), such that the electric, magnetic, and magneto-electric polarizabilities are equal, and discuss unusual refractive and absorptive properties of artificial chiral materials based on such...

  • Super Unit Cells in Aperture-Based Metamaterials. Tanasković, Dragan; Jakšić, Zoran; Obradov, Marko; Jakšić, Olga // Journal of Nanomaterials;1/31/2015, Vol. 2015, p1 

    An important class of electromagnetic metamaterials are aperture-based metasurfaces. Examples include extraordinary optical transmission arrays and double fishnets with negative refractive index. We analyze a generalization of such metamaterials where a simple aperture is now replaced by a...

  • Modified Luneburg Lens Based on Metamaterials. Chen, Haibing; Cheng, Qiang; Huang, Aihua; Dai, Junyan; Lu, Huiying; Zhao, Jie; Ma, Huifeng; Jiang, Weixiang; Cui, Tiejun // International Journal of Antennas & Propagation;5/18/2015, Vol. 2015, p1 

    We present the design, fabrication, and experimental characterization of a modified two-dimensional Luneburg lens based on bulk metamaterials. The lens is composed by a number of concentric layers. By varying the geometric dimensions of unit cells in each layer, the gradient refractive index...

  • High-Directivity Antenna Array Based on Artificial Electromagnetic Metamaterials with Low Refractive Index. Xiao, Zhigang; Yao, Jiang; Yin, Shaoquan // International Journal of Antennas & Propagation;10/5/2015, Vol. 2015, p1 

    Planar metamaterials (MTMs) with low refractive index are proposed as a cover in a high-gain patch antenna array configuration. This MTMs array antenna has the following features: the number of array elements significantly decreases compared with the conventional array; the elements spacing is...

  • Realization of an all-dielectric zero-index optical metamaterial. Moitra, Parikshit; Yang, Yuanmu; Anderson, Zachary; Kravchenko, Ivan I.; Briggs, Dayrl P.; Valentine, Jason // Nature Photonics;Oct2013, Vol. 7 Issue 10, p791 

    Metamaterials offer unprecedented flexibility for manipulating the optical properties of matter, including the ability to access negative index, ultrahigh index and chiral optical properties. Recently, metamaterials with near-zero refractive index have attracted much attention. Light inside such...

  • Zero index metamaterials with checkerboard structure. Kwon, D.-H.; Li, L.; Bossard, J. A.; Bray, M. G.; Werner, D. H. // Electronics Letters;3/15/2007, Vol. 43 Issue 6, p319 

    A metamaterial design is presented with an effectively zero index of refraction, which utilises Drude-type material blocks arranged in a checkerboard pattern within a nondispersive dielectric host. An averaging effect over constituent materials of the checkerboard structure yields an effective...

  • Enhanced sensing performance by the plasmonic analog of electromagnetically induced transparency in active metamaterials. Zheng-Gao Dong; Hui Liu; Jing-Xiao Cao; Tao Li; Shu-Ming Wang; Shi-Ning Zhu; Zhang, X. // Applied Physics Letters;9/13/2010, Vol. 97 Issue 11, p114101 

    The gain-assisted plasmonic analog of electromagnetically induced transparency (EIT) in a metallic metamaterial is investigated for the purpose to enhance the sensing performance of the EIT-like plasmonic structure. The structure is composed of three bars in one unit, two of which are parallel...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics