Metamaterial Particles for Electromagnetic Energy Harvesting
ABSTRACT Metamaterials are typically made of an ensemble of electrically small resonators such as metallic loops. The fact that such particles resonate individually to generate a bulk material behavior having enhanced constitutive parameters is essentially indicative of these particles' ability to collect energy. We show that such particles act as energy collectors when a resistive load is inserted within the particle's gap. A proof of concept is provided using a 5.8 GHz field and a split-ring resonator (SRR) as the electromagnetic energy collecting cell. Numerical simulation for a 9 × 9 SRR array shows the effectiveness of an SRR array as an energy collector plate.
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ABSTRACT: This work introduces a class of electrically small resonators composed of a complementary split-ring resonator backed by a ground plane. The proposed structure has low profile, efficient for wide range of illumination angles and can be placed on metallic surfaces. An example unit cell was designed, optimized, and fabricated to resonate at around 5.8 GHz. It is shown through numerical simulations and laboratory measurements that the complementary split-ring resonator can efficiently deliver the incident power carried by an electromagnetic wave to a resistive load.Applied Physics Letters 04/2014; 104(16):163903-163903-4. DOI:10.1063/1.4873587 · 3.52 Impact Factor
Conference Paper: Harvesting electromagnetic energy using metamaterial particles[Show abstract] [Hide abstract]
ABSTRACT: A novel electromagnetic energy harvester based on Split Ring Resonators (SRR) is presented. The resonance phenomenon of SRR cells is indicative of their ability to trap electromagnetic energy from an incoming wave. This paper shows that an SRR cell can potentially be used to harvest electromagnetic energy by placing a resistive load across the gap of the resonator. To prove the concept, a prototype of a loaded single loop SRR resonating at 5.8 GHz is simulated, fabricated and tested. We show through numerical simulations that an SRR array can harvest electromagnetic energy effectively across wide range of incident angles.2013 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting; 07/2013
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ABSTRACT: Polarization is one of the fundamental properties of electromagnetic waves, conveying valuable information in signal transmission and sensitive measurements. We investigated the controllability of dual-band absorption metamaterials whose unit cells were designed and fabricated based on the conventional absorber model with proper manipulation of the structural pattern. Dual-band perfect absorption is achieved and gradually switched off according to the polarization angle. Moreover, another mode emerges concomitantly at higher frequencies. The electromagnetic properties were investigated to clarify the mechanisms of dual-band perfect absorption and polarization-sensitive switchable effects. Our work was demonstrated experimentally in the gigahertz range and applied to the terahertz region.Journal of the Optical Society of America B 11/2014; 31(11). DOI:10.1364/JOSAB.31.002744 · 1.81 Impact Factor