Abstract
Many real-world applications, including adaptive radar scanning and smart stealth, require reconfigurable multifunctional devices to simultaneously manipulate multiple degrees of freedom of electromagnetic (EM) waves in an on-demand manner. Recently, kirigami technique, affording versatile and unconventional structural transformation, has been introduced to endow metamaterials with the capability of controlling EM waves in a reconfigurable manner. Here, we report for a kirigami-inspired sparse meta-architecture, with structural density of 1.5% in terms of the occupation space, for adaptive invisibility based on independent operations of frequency, bandwidth, and amplitude. Based on the general principle of dipolar management via structural reconstruction of kirigami-inspired meta-architectures, we demonstrate reconfigurable invisibility management with abundant EM functions and a wide tuning range using three enantiomers (A, B, and C) of different geometries characterized by the folding angle β. Our strategy circumvents issues of limited abilities, narrow tuning range, extreme condition, and high cost raised by available reconfigurable metamaterials, providing a new avenue toward multifunctional smart devices.
Highlights
Achieving reconfigurable scattering or invisibility [1] adaptive to environmental variation over a large tuning range is of great importance for a smart radar system [2]
Extensive investigations have been carried out to achieve functional reconfigurable devices based on electrical tuning by using varactor [3,4,5,6,7,8,9], PIN diode [10,11,12], Schottky diode [13], photodiode [14], micro-electro-mechanical systems (MEMS) [15], and even nano-electro-mechanical systems (NEMS) [16]
Based on our kirigamiinspired schemes, we start from the periodic meta-atom array where each meta-atom is composed of four electric dipoles, closely placed but with different orientations
Summary
Achieving reconfigurable scattering or invisibility [1] adaptive to environmental variation over a large tuning range is of great importance for a smart radar system [2]. Extensive investigations have been carried out to achieve functional reconfigurable devices based on electrical tuning by using varactor [3,4,5,6,7,8,9], PIN diode [10,11,12], Schottky diode [13], photodiode [14], micro-electro-mechanical systems (MEMS) [15], and even nano-electro-mechanical systems (NEMS) [16] These schemes involve an external knob and typically suffer from additional losses, complex systems, and limited tuning ranges, when operating at microwave frequencies with long wavelengths. Other tunable techniques by using transparent conductive oxide [17], liquid crystals [18,19,20,21,22], phase change materials (PCMs) [23] like vanadium dioxide
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