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It is commonly believed that most of naturally occurring transparent materials have small positive refractive indices around 1 in the terahertz waveband. However, metamaterials have made a paradigm shift and achieve the design of man-made materials with both on-demand electromagnetic properties and unprecedented refractive indices. Here, inspired by the metamaterial concept, we report a transparent...
We study plasmonic properties of metal nanoparticles with sharp corner- and tip-shaped surface perturbations supporting plasmon resonances superlocalized on the scale of the curvature radius. We reveal the conditions for employing such particles as nano-antennas that precisely couple the free-space light to the nanosize volumes near the perturbation apexes with the light fields enhanced by several...
This paper proposes the reflection and transmission control structure using the artificially designed materials and a dielectric layer. As the artificially designed material, finite- and infinite-length metal wire array sheets are used here. The reflection and transmission characteristics of the laminated structures are evaluated experimentally in free space.
This paper proposes reflection and transmission controlling materials using the artificially designed material. As the artificially designed material, finite- and infinite-length metal wire array sheets are used here. The laminated structures consisting of the metal wire array sheets and dielectric material are proposed. Reflection and transmission characteristics of these sheets can be controlled...
This paper proposes reflection and transmission controlling materials using the artificially designed material. As the artificially designed material, the metal wire array sheets are used here. The laminated structures consisting of the metal wire array sheet and dielectric layer are proposed. Reflection and transmission characteristics of these structures can be controlled by changing the sheet parameters...
In this paper, properties of artificially-designed materials and their applications in electromagnetic (EM) wave absorber are discussed. First, EM-wave absorber composed of the straight length wire array sheet and a ferrite-powder/rubber mixture plate is investigated. The absorbing characteristics of the absorber using the wire array sheet can be matched at around the resonant frequency of the sheet...
The concept of quality factor enhancement in a two dimensional rectangular dielectric resonator (RDR), based on the phenomenon of edge diffraction suppression by a plasma, is presented. This phenomenon occurs when the plasma exhibits the specific negative permittivity, which makes the RDR separable, i.e., analytically solvable by means of the separation of variables. The Rotman plasma, constituted...
An on-chip buck converter with 3D chip stacking is proposed and the operation is experimentally verified. The manufactured converter achieves a maximum power efficiency of 62% for an output current of 70mA with a switching frequency of 200MHz and a 2x2mm on-chip LC output filter in 0.35mum CMOS. The use of glass epoxy interposer to increase the maximum power efficiency up to 71.3%, and the power efficiency...
Based on the electromagnetic scattering theory of dielectric wire and effective medium theory, the effective dielectric constant in the simple-cubic lattice of metal wire is derived. Numerical result reveals that effective dielectric constant become negative at frequency below some frequency, which in the case of a strong skin effect, is determined by the crystal structure only. The reflection characteristics...
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