Asymmetric transmission of linearly polarized electromagnetic waves using chiral metamaterials with constant chirality over a certain frequency band

2014 ◽  
Vol 28 (32) ◽  
pp. 1450250 ◽  
Author(s):  
Furkan Dincer ◽  
Muharrem Karaaslan ◽  
Oguzhan Akgol ◽  
Emin Unal ◽  
Cumali Sabah
Keyword(s):  
Frequency Band ◽  
Electromagnetic Waves ◽  
Dynamic Structure ◽  
Dielectric Substrate ◽  
Suggested Model ◽  
Asymmetric Transmission ◽  
Chiral Metamaterials ◽  
Linearly Polarized ◽  
Novel Devices ◽  
Polarization Rotators

In this study, a dynamic chiral metamaterial (MTM) structure leading to an asymmetric electromagnetic (EM) wave transmission for linear polarization is presented. The structure is composed of square-shaped resonator with gaps on both sides of a dielectric substrate with a certain degree of rotation. The dynamic structure is adjustable via various parameters to fit any desired frequency ranges. Theoretical and experimental analysis of the proposed structure are conducted and given in detail. The suggested model can provide constant chirality over a certain frequency band and thus, it can be used to design myriad novel devices such as EM transmission and antireflection filters, and polarization rotators for desired frequency regimes.

scholarly journals Asymmetric Transmission in a Mie-Based Dielectric Metamaterial with Fano Resonance

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1003 ◽  
Author(s):  
Xiaobo Wang ◽  
Haohua Li ◽  
Ji Zhou
Keyword(s):  
High Performance ◽  
Near Field ◽  
Destructive Interference ◽  
Asymmetric Transmission ◽  
Microwave Frequencies ◽  
Chiral Metamaterials ◽  
Field Coupling ◽  
Polarized Waves ◽  
Linearly Polarized ◽  
Polarization Rotators

Chiral metamaterials with asymmetric transmission can be applied as polarization-controlled devices. Here, a Mie-based dielectric metamaterial with a spacer exhibiting asymmetric transmission of linearly polarized waves at microwave frequencies was designed and demonstrated numerically. The unidirectional characteristic is attributed to the chirality of the metamolecule and the mutual excitation of the Mie resonances. Field distributions are simulated to investigate the underlying physical mechanism. Fano-type resonances emerge near the Mie resonances of the constituents and come from the destructive interference inside the structure. The near-field coupling further contributes to the asymmetric transmission. The influences of the lattice constant and the spacer thickness on the asymmetric characteristics were also analyzed by parameter sweeps. The proposed Mie-based metamaterial is of a simple structure, and it has the potential for applications in dielectric metadevices, such as high-performance polarization rotators.

New generation planar chiral metamaterials with small and constant chirality over a certain frequency band

2015 ◽  
Vol 29 (01) ◽  
pp. 1450257
Author(s):  
Furkan Dincer ◽  
Muharrrem Karaaslan ◽  
Oguzhan Akgol ◽  
Emin Unal ◽  
Ekrem Demirel ◽  
...  
Keyword(s):  
Frequency Band ◽  
Ring Resonators ◽  
Split Ring ◽  
Chiral Metamaterials ◽  
Proposed Model ◽  
Time In Literature ◽  
New Generation ◽  
Novel Devices ◽  
Electromagnetic Transmission ◽  
Polarization Rotators

Chiral metamaterial (MTM) researchers generally concentrate and aim to obtain large chirality with optical activity in certain frequencies. However, new generation planar chiral MTM which have small and constant/flat chirality over a certain frequency band have not queried by this time in literature. In fact, this area is mostly ignored by researchers. This study, first one according to best of our knowledge in the literature, is investigating the small and constant/fixed chirality and focuses on the new generation planar chiral MTM based on circular split ring resonators (SRRs), in details. It can be seen from the results that the proposed model can provide small and constant/flat chirality over a certain frequency band and thus it can be used to design myriad novel devices such as polarization rotators, and electromagnetic transmission and antireflection filters for several frequency regions.

New generation chiral metamaterials with small and flat chirality over a certain frequency band based on circular split ring resonators for microwave filter applications

2016 ◽  
Vol 30 (08) ◽  
pp. 1650114
Author(s):  
Furkan Dincer ◽  
Oguzhan Akgol ◽  
Muharrem Karaaslan ◽  
Emin Unal ◽  
Ekrem Demirel ◽  
...  
Keyword(s):  
Frequency Band ◽  
Ring Resonators ◽  
Microwave Filter ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Chiral Metamaterials ◽  
Suggested Structure ◽  
New Generation ◽  
Polarization Rotators

There are many studies in literature on chiral metamaterials (MTMs) to obtain large chiralities with dynamic optical activities. With this regard, this new generation planar chiral MTM study focuses on a small, non-dispersive (constant/flat) chirality admittance over an indicated frequency band which has not been investigated so far in literature. This new generation planar chiral MTM provides a small and a constant/fixed chirality which is mostly ignored by the scientists. This study numerically and experimentally investigates and examines these new generation MTMs based on circular split ring resonators (SRRs) with an increased capacitance in details. Obtained results show that the suggested structure can provide a small and constant/flat chirality admittance over a certain frequency band and hence it can be used to design myriad novel electromagnetic (EM) devices such as transmission and antireflection filters, polarization rotators for any desired frequency regions.

Asymmetric transmission of linearly polarized waves in terahertz chiral metamaterials

2017 ◽  
Vol 121 (3) ◽  
pp. 033103 ◽  
Author(s):  
Shenying Fang ◽  
Kang Luan ◽  
Hui Feng Ma ◽  
Wenjin Lv ◽  
Yuxiang Li ◽  
...  
Keyword(s):  
Asymmetric Transmission ◽  
Chiral Metamaterials ◽  
Polarized Waves ◽  
Linearly Polarized
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