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Anisotropy modeling of terahertz metamaterials: polarization dependent resonance manipulation by meta-atom cluster.

Jung H, In C, Choi H, Lee H - Sci Rep (2014)

Bottom Line: Most metamaterials are known to have anisotropic properties, but existing anisotropy models are applicable only to a single meta-atom and its properties.Here we propose an anisotropy model for asymmetrical meta-atom clusters and their polarization dependency.The proposed anisotropic meta-atom clusters show a unique resonance property in which their frequencies can be altered for parallel polarization, but fixed to a single resonance frequency for perpendicular polarization.

View Article: PubMed Central - PubMed

Affiliation: 1] School of Electronic Engineering, Soongsil University, Seoul 156-743, Korea [2].

ABSTRACT
Recently metamaterials have inspired worldwide researches due to their exotic properties in transmitting, reflecting, absorbing or refracting specific electromagnetic waves. Most metamaterials are known to have anisotropic properties, but existing anisotropy models are applicable only to a single meta-atom and its properties. Here we propose an anisotropy model for asymmetrical meta-atom clusters and their polarization dependency. The proposed anisotropic meta-atom clusters show a unique resonance property in which their frequencies can be altered for parallel polarization, but fixed to a single resonance frequency for perpendicular polarization. The proposed anisotropic metamaterials are expected to pave the way for novel optical systems.

No MeSH data available.


Related in: MedlinePlus

Experimental results of complementary H-shaped meta-atom cluster arrays.(a) Optical microscopy images of our fabricated complementary H-shaped meta-atom clusters with different numbers (single, double, triple, and quad) of complementary H-shaped unit cells. Measured and simulated transmission spectra of the proposed complementary H-shaped metamaterials (b) for parallel polarization and (c) for perpendicular polarization.
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f6: Experimental results of complementary H-shaped meta-atom cluster arrays.(a) Optical microscopy images of our fabricated complementary H-shaped meta-atom clusters with different numbers (single, double, triple, and quad) of complementary H-shaped unit cells. Measured and simulated transmission spectra of the proposed complementary H-shaped metamaterials (b) for parallel polarization and (c) for perpendicular polarization.

Mentions: In order to verify the proposed equation for the H-shaped meta-atom clusters, we simulated and measured the transmission spectra, as shown in Figure 5b and c. The resonance frequencies of the single, double, triple, and quad meta-atom clusters for parallel polarization are 2.75, 2.15, 1.85, and 1.6 THz, respectively, while the resonance frequencies for perpendicular polarization are fixed at 6.1 THz for all structures. These results show that the results from the proposed equations well match with the measured resonances, and that the H-shaped anisotropic meta-atom and its clusters can alter the resonance frequency for parallel polarization, but fix the resonance frequency without any perturbation for perpendicular polarization, unlike the previous SSR metamaterial structures. Furthermore, as discussed above, the complementary H-shaped meta-atom clusters have similar resonance properties, as shown in Figure 6.


Anisotropy modeling of terahertz metamaterials: polarization dependent resonance manipulation by meta-atom cluster.

Jung H, In C, Choi H, Lee H - Sci Rep (2014)

Experimental results of complementary H-shaped meta-atom cluster arrays.(a) Optical microscopy images of our fabricated complementary H-shaped meta-atom clusters with different numbers (single, double, triple, and quad) of complementary H-shaped unit cells. Measured and simulated transmission spectra of the proposed complementary H-shaped metamaterials (b) for parallel polarization and (c) for perpendicular polarization.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4048888&req=5

f6: Experimental results of complementary H-shaped meta-atom cluster arrays.(a) Optical microscopy images of our fabricated complementary H-shaped meta-atom clusters with different numbers (single, double, triple, and quad) of complementary H-shaped unit cells. Measured and simulated transmission spectra of the proposed complementary H-shaped metamaterials (b) for parallel polarization and (c) for perpendicular polarization.
Mentions: In order to verify the proposed equation for the H-shaped meta-atom clusters, we simulated and measured the transmission spectra, as shown in Figure 5b and c. The resonance frequencies of the single, double, triple, and quad meta-atom clusters for parallel polarization are 2.75, 2.15, 1.85, and 1.6 THz, respectively, while the resonance frequencies for perpendicular polarization are fixed at 6.1 THz for all structures. These results show that the results from the proposed equations well match with the measured resonances, and that the H-shaped anisotropic meta-atom and its clusters can alter the resonance frequency for parallel polarization, but fix the resonance frequency without any perturbation for perpendicular polarization, unlike the previous SSR metamaterial structures. Furthermore, as discussed above, the complementary H-shaped meta-atom clusters have similar resonance properties, as shown in Figure 6.

Bottom Line: Most metamaterials are known to have anisotropic properties, but existing anisotropy models are applicable only to a single meta-atom and its properties.Here we propose an anisotropy model for asymmetrical meta-atom clusters and their polarization dependency.The proposed anisotropic meta-atom clusters show a unique resonance property in which their frequencies can be altered for parallel polarization, but fixed to a single resonance frequency for perpendicular polarization.

View Article: PubMed Central - PubMed

Affiliation: 1] School of Electronic Engineering, Soongsil University, Seoul 156-743, Korea [2].

ABSTRACT
Recently metamaterials have inspired worldwide researches due to their exotic properties in transmitting, reflecting, absorbing or refracting specific electromagnetic waves. Most metamaterials are known to have anisotropic properties, but existing anisotropy models are applicable only to a single meta-atom and its properties. Here we propose an anisotropy model for asymmetrical meta-atom clusters and their polarization dependency. The proposed anisotropic meta-atom clusters show a unique resonance property in which their frequencies can be altered for parallel polarization, but fixed to a single resonance frequency for perpendicular polarization. The proposed anisotropic metamaterials are expected to pave the way for novel optical systems.

No MeSH data available.


Related in: MedlinePlus