Maximized Circular Dichroism induced by Geometrical Parameters in Twisted Layered Chiral Metamaterials

We have studied twisted layered chiral metamaterials (TLCMs) which have three twisted-layers with C4-symmetric unit cell. Chiral metamaterials which exhibit broken mirror symmetry have the potential to be used for many sensing applications. However, most of previously reported chiral metamaterials exhibit weak chiroptical property, thus practical applications of chiral metamaterials are hindered. Here, we propose the TLCMs and corresponding enhanced circular dichroism (CD) which is derived from the layer coupling effect.In this work, the relationship between the chiroptical quantity (CD) and the geometrical parameters (e.g. layer thickness and twisted angle of each layer) are studied. Although the many researchers have studied the chirality due to the twisted angle and the nondispersive bi-layer chiral metamaterials but, the maximized CD depending on the layer position is not conducted. We will provide a generalized way to enhance CD response in TLCMs having C4 symmetric multi-layers.1

Engineered hydrogenated amorphous silicon for functional metasurfaces working at the visible frequencies

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Tailoring complex refractive index of amorphous silicon via chemical vapor deposition equilibrium

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Phase-gradient TiO2 metasurfaces by plasma-enhanced local crystallizing

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Ultra-High Refractive Index of Optically Transparent Hydrogenated Amorphous Silicon for a Low-Cost Functional Photonic Device at The Visible Frequencies

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Generating perfect optical vortex on the hybrid-Poincaré sphere by using tunable metasurface

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Adaptive Control of the Packet Transmission Period with Solar Energy Harvesting Prediction in Wireless Sensor Networks

A number of research works has studied packet scheduling policies in energy scavenging wireless sensor networks, based on the predicted amount of harvested energy. Most of them aim to achieve energy neutrality, which means that an embedded system can operate perpetually while meeting application requirements. Unlike other renewable energy sources, solar energy has the feature of distinct periodicity in the amount of harvested energy over a day. Using this feature, this paper proposes a packet transmission control policy that can enhance the network performance while keeping sensor nodes alive. Furthermore, this paper suggests a novel solar energy prediction method that exploits the relation between cloudiness and solar radiation. The experimental results and analyses show that the proposed packet transmission policy outperforms others in terms of the deadline miss rate and data throughput. Furthermore, the proposed solar energy prediction method can predict more accurately than others by 6.92%

Enhancing the robustness of metasurfaces via versatile encapsulation coating

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Dual-mode anti-counterfeiting system via Hydrogel-based Reconfigurable metasurface

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