scholarly journals Conjugated gammadion chiral metamaterial with uniaxial optical activity and negative refractive index

2011 ◽  
Vol 83 (3) ◽  
Author(s):  
R. Zhao ◽  
L. Zhang ◽  
J. Zhou ◽  
Th. Koschny ◽  
C. M. Soukoulis
Keyword(s):  
Refractive Index ◽  
Optical Activity ◽  
Negative Refractive Index ◽  
Chiral Metamaterial

Analysis of Negative Refractive Index Asymmetric Chiral Metamaterial Based on L Shaped Structure

2016 ◽  
Vol 17 ◽  
pp. 58-65 ◽  
Author(s):  
Tariq Rahim ◽  
Jia Dong Xu
Keyword(s):  
Refractive Index ◽  
Electric Fields ◽  
Optical Activity ◽  
Negative Refractive Index ◽  
Numerical Study ◽  
Microwave Frequency ◽  
Orthogonal Components ◽  
Reflection Characteristics ◽  
Output Interface ◽  
Chiral Metamaterial

An asymmetrical chiral metamaterial at microwave frequency is constructed by using four double-layered L-shaped strips which are rotated by 900 with respect to their adjacent metal strip. These different size strips allows another degree of freedom in the equalizing the orthogonal components of the electric fields at the output interface with 90o phase difference when the x-polarized wave excites the structure. The proposed structure exhibits the properties of chiral medium such as optical activity and circular dichroism. The L shaped chiral objects can be etched on double side substrate. The effect of structure on different electromagnetic parameter like chirality, optical activity and reflection characteristics are analyzed. Due to the strong chirality the structure posses negative refractive index for either left circularly or right circularly polarized wave. In this paper, a numerical study in the frequency domain of the electromagnetic-wave propagation through these types of structures is achieved by using the commercial software Computer Simulation Technology (CST) microwave studio.

Free-standing terahertz chiral meta-foils exhibiting strong optical activity and negative refractive index

2013 ◽  
Vol 103 (14) ◽  
pp. 141106 ◽  
Author(s):  
Jianfeng Wu ◽  
Binghao Ng ◽  
Shuvan P. Turaga ◽  
Mark B. H. Breese ◽  
Stefan A. Maier ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Activity ◽  
Negative Refractive Index ◽  
Free Standing

Flexible chiral metamaterials with dynamically optical activity and high negative refractive index

2015 ◽  
Vol 29 (18) ◽  
pp. 1550087 ◽  
Author(s):  
Furkan Dincer ◽  
Muharrem Karaaslan ◽  
Emin Unal ◽  
Oguzhan Akgol ◽  
Cumali Sabah
Keyword(s):  
Numerical Simulation ◽  
Refractive Index ◽  
Numerical Analysis ◽  
Optical Activity ◽  
Negative Refractive Index ◽  
Experimental Results ◽  
Polarization Converter ◽  
Dynamic Design ◽  
Chiral Metamaterials ◽  
Good Agreement

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 index due to the large chirality in order to obtain an efficient polarization converter. We also present a numerical analysis in order to show the additional features of the proposed chiral MTM in detail. Therefore, a MTM sensor application of the proposed chiral MTM is introduced and discussed. The presented chiral designs offer a much simpler geometry and more efficient outlines. The experimental results are in a good agreement with the numerical simulation. It can be seen from the results that, the suggested chiral MTM can be used as a polarization converter, sensor, etc. for several frequency regimes.

Multi-band terahertz chiral metasurface with giant optical activities and negative refractive index based on T-shaped resonators

2018 ◽  
Vol 32 (30) ◽  
pp. 1850366 ◽  
Author(s):  
Hao Ran Chen ◽  
Yong Zhi Cheng ◽  
Jing Cheng Zhao ◽  
Xue Song Mao
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Optical Activity ◽  
Current Density ◽  
Physical Mechanism ◽  
Negative Refractive Index ◽  
Periodic Array ◽  
Density Distributions ◽  
Circular Dichroïsm ◽  
Multi Band

A novel chiral metasurface (CMS) based on T-shaped resonators is proposed and investigated numerically. The CMS is composed of a periodic array of bi-layered conjugated fourfold T-shaped structure. The retrieved effective electromagnetic (EM) parameters indicate that the multi-band negative refractive index associated with strong optical activity and circular dichroism (CD) effect is realized in terahertz (THz) region. The physical mechanism is illustrated by analyzing the current density distributions. Due to its exotic chiral optical properties, the proposed CMS is useful for the development of THz devices.

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