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In this paper, we report a new and generic method for all-dielectric resonators operating at terahertz (THz) frequencies based on polymer/ceramic composite particles. In this method, the polymer solution is added into ceramic powders (strontium titanate) and prilling technology is employed to make them become polymer/ceramic composite micro particles. The prepared micro particles are then assembled as single-layer all-dielectric resonators. By using a THz time-domain spectrometer, we find that various Mie resonances can be induced in these all-dielectric resonators. It is also demonstrated that the permittivity of the composite particles can be improved by being sintered at proper temperatures, thereby provides a new way for ceramic all-dielectric resonators in THz range. This method, free from complex process, time-consuming, expensive equipment, and clean room, provides a generic method for high-throughput and low cost THz all-dielectric resonators, which is promising for developing potential applications in wide-bandwidth THz devices. [ABSTRACT FROM AUTHOR]

In this work, we propose an electrostatic field concentrator using electrostatic metamaterial. Specifically, a shell with anisotropic dielectric constant is employed to concentrate the electrostatic field into core region to achieve an enhanced electrostatic field (192% of the applied electrostatic field intensity) and keep the external field undistorted simultaneously. As such, a fan-shaped structure consisting of alternating wedges is designed, fabricated and tested. The good agreement between the experimental and simulated results certifies the feasibility of our scheme. Our study suggests that the proposed device has potential applications in noninvasive detection, energy transfer and other electrostatic related fields. [ABSTRACT FROM AUTHOR]

An isotropic Mie resonance-based metamaterial perfect absorber with near unity absorbance is experimentally and numerically demonstrated. The metamaterial is constructed with an array of dielectric cubes and a metallic ground plane. The absorption peak of the metamaterial perfect absorber is dependent on the permittivity and the side length of the dielectric cubes. A good agreement between experimental and simulated result at X band absorption is achieved. [ABSTRACT FROM AUTHOR]