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CÁC THÀNH TỰU TIÊU BIỂU
CÁC CÔNG BỐ TIÊU BIỂU
Magnetic metamaterials for wireless power transfer (WPT)
Magnetic metamaterials operating at low megahertz frequencies provide various important commercial and research applications. We investigate the control of wave propagation in two-dimensional (2-D) tunable magnetic metamaterials for wireless power transfer (WPT). The propagation control is achieved by using reconfigurable defect cavities formed in the metamaterial, which allows for the dynamic creation of various waveguide configurations with switching control. The physical mechanism for creating the cavity is described using Fano interference, in which the resonant frequency of the cavity falls into the bandgap of the metasurface. And the routing and transmission control of the proposed waveguide is easily achieved by resonant switching. The proposed approach allows highly localized, strong field confinement in the deep subwavelength scale of 2.6λ × 10-3. The transmission losses and bandwidths of various dynamically tunable metamaterial waveguides are experimentally characterized. This result can find useful applications for integrated surface wave devices and planar WPT.
Reference: Thanh Son Pham, Huu. Nguyen Bui, and Jong Wook Lee, “Wave propagation control and switching for wireless power transfer using tunable 2-D magnetic metamaterials,” Journal of Magnetism and Magnetic Materials,” vol. 485, pp. 126-135, Apr. 2019.
Plasmonic Hybridization in Metamaterials
A simple but general mechanism is introduced to realize the dual magnetic resonance exhibiting a broadband negative permeability. A satisfactory explanation, based on the second-order hybridization of symmetric metamaterials, for resonant splitting is given. It is manifested that the geometric correlation plays a vital role in controlling the hybridization strength. Transfer matrix simulations and equivalent circuit model analysis are performed to corroborate our idea. In the left Figure, the transmission evolution of second-ordered hybridized CWP metamaterials according to lattice constant in the k direction a(z).
Reference: V. T. T. Thuy et al., Optics Communications 283, 4303 (2011) and N. T. Tung et al., Applied Physics Express 5, 112001 (2012).
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