scholarly journals MULTI-BAND CIRCULAR POLARIZER USING ARCHIMEDEAN SPIRAL STRUCTURE CHIRAL METAMATERIAL WITH ZERO AND NEGATIVE REFRACTIVE INDEX

2013 ◽  
Vol 141 ◽  
pp. 645-657 ◽  
Author(s):  
Liyun Xie ◽  
He-Lin Yang ◽  
Xiaojun Huang ◽  
Zhenjun Li
Keyword(s):  
Refractive Index ◽  
Spiral Structure ◽  
Negative Refractive Index ◽  
Archimedean Spiral ◽  
Circular Polarizer ◽  
Chiral Metamaterial ◽  
Multi Band

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.

scholarly journals MULTI-BAND NEGATIVE REFRACTIVE INDEX IN FERRITE-BASED METAMATERIALS

2013 ◽  
Vol 140 ◽  
pp. 457-469 ◽  
Author(s):  
Ke Bi ◽  
Ji Zhou ◽  
Xiaoming Liu ◽  
Chuwen Lan ◽  
Hongjie Zhao
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Multi Band

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.

scholarly journals Kajian Gejala Penyearahan Optik pada Metamaterial Chiral

2017 ◽  
Vol 4 (02) ◽  
pp. 149
Author(s):  
Juliasih Partini ◽  
Kamsul Abraha ◽  
Arief Hermanto ◽  
Satoshi Tomita ◽  
Matsui Takahiro
Keyword(s):  
Refractive Index ◽  
Negative Refractive Index ◽  
Second Harmonic ◽  
Harmonic Wave ◽  
Optical Rectification ◽  
Polarization Angle ◽  
Linear Optics ◽  
Alternative Source ◽  
Non Linear ◽  
Chiral Metamaterial

<p>Chiral metamaterial is a new breakthrough in the fabrication of a metamaterial because of the capability of providing different refractive index values for each circular polarization angle. This provides opportunities to obtain negative refractive index values, without the necessity to have simultaneously negative values for both permittivity and permeability. This study investigated the optical rectification, which is the phenomenon of second order non-linear optics in the chiral metamaterial. This relates to the testing of the new designs of square structure chiral metamaterial. Optical rectification is often used to 'rectify' femtoseconds laser from the realm of visible light into the terahertz domain. Nonlinear response of metamaterial was observed by terahertz emission spectroscopy. The results showed that the obtained terahertz signal is proportional to the square of the laser power used. This suggests that in the<br />incoherent optical rectification, there is a mixture of optical rectification with the second harmonic wave generation. Development of square-structured chiral metamaterials is expected to be an alternative source of material due to the lack of non-linear material that can be used in the terahertz domain.</p>

Multi-band Terahertz Chiral Metamaterials Based on Complementary Cross-wire Structure

2013 ◽  
Vol 455 ◽  
pp. 137-141 ◽  
Author(s):  
Pan Zhang ◽  
Zheng Ze Cheng ◽  
Hong Xu Cao
Keyword(s):  
Finite Element Method ◽  
Refractive Index ◽  
Negative Refractive Index ◽  
The Finite Element Method ◽  
Chiral Metamaterials ◽  
Terahertz Region ◽  
Fem Method ◽  
Potential Applications ◽  
Cross Wire ◽  
Multi Band

In this paper, a multi-band chiral metamaterials (CMMs) based on complementary cross-wire structure is proposed and studied numerically. The finite element method (FEM) method was used to simulate the EM properties of the designed structure. Numerical results indicate that the giant optical activity and multiband negative refractive index can be realized in terahertz region. The proposed CMMs may have some potential applications in novel terahertz device.Particle size of bayerite (d50) was about 24 μm. Al2O3was obtained after calcination at 1050 °C for 1.5 h.

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