Abstract
The asymmetric transmission of electromagnetic (EM) wave can be fully manipulated by chiral metamaterials, but little can achieve real-time and high efficient tunability due to challenges in practically deployable solutions. Here, we proposed a new scheme for flexibly and dynamically controlling the asymmetric EM wave transmission at microwave frequencies using planar metamaterial of deep subwavelength thickness incorporated with active components of PIN diodes. The asymmetric transmission of linearly polarized EM wave exhibits a high efficiency and a pronounced real-time continuous tunability controlled by the external stimulation of voltage biasing. In addition, the asymmetric transmission effect can be well preserved at large oblique incident angle up to ±70°. The design principle and EM performance are validated by both full wave simulations and experimental measurements. Such dynamically controllable chiral metamaterial may provide robust and flexible approach to manipulate EM wave propagation, as well as to facilitate EM device integration to create diverse functionalities.
Highlights
Asymmetric transmission of EM wave is successfully realized by various types of metamaterials with symmetry-broken chiral configurations, its performance is usually fixed which lacks of dynamic and reconfigurable control, and inherently limits its practical uses[7,8,9,10,34,35,36,37,38,39]
The proposed active chiral metamaterial is based on such twisted split ring resonators (SRRs) structure, and the configuration of the unit cell is sketched in the lower-left part of Fig. 1
We have realized real-time tunability of active chiral metamaterial structure with specific metallic cut wires connected by PIN diodes, which can be changed from an insulator to an almost conductive one upon corresponding electrical biasing
Summary
Asymmetric transmission of EM wave is successfully realized by various types of metamaterials with symmetry-broken chiral configurations, its performance is usually fixed which lacks of dynamic and reconfigurable control, and inherently limits its practical uses[7,8,9,10,34,35,36,37,38,39]. Some theoretical proposals have been reported to realize dynamic asymmetric transmission for certain polarized EM wave[23,25], but practical challenges are still needed to be tackled for real-time tunability with practically deployable solutions. We proposed a new strategy to realize dynamic control of the asymmetric transmission for certain linearly polarized EM waves at microwave frequencies. The dynamic performances have been validated both from the simulation and measurement on fabricated prototype with good coincidence with each other. We expect such dynamically controllable chiral metamaterial could provide new ways for active and reconfigurable functionality, which may be applicable to versatile compact EM device designs
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