Invisible Sensors: Simultaneous Sensing and Camouflaging in Multiphysical Fields
Invisible Sensors: Simultaneous Sensing and Camouflaging in Multiphysical Fields
复制标题
DOI：
10.1002/adma.201502513
复制
发表时间：
2015-12-16
影响因子：
29.4
通讯作者：
Qiu, Cheng-Wei
中科院分区：
文献类型：
--
作者：
Yang, Tianzhi;Bai, Xue;Qiu, Cheng-Wei
DOI: 10.1002/adma. 201502513 maintaining its receiving ability. However, this technique is only valid for a single physical field, eg, an invisible electromagnetic sensor or an invisible acoustic detector.[2–4] Consequently, a single-functional sensor is invisible to an acoustic monitoring receiver, but it can be easily detected using a remote thermal imager. Is it possible to create a sensor that is invisible in multiple physical fields while maintaining the same sensing functionality?This is very challenging, if not impossible, to achieve, even using the concept of metamaterials, which are man-made composites that control waves and energy flux in unprecedented ways, resulting in exotic behaviors that are absent in nature. For example, electromagnetic metamaterials were proposed to manipulate electromagnetic waves and produce an invisibility cloak.[5–7] This pioneering idea motivated a number of significant applications, such as the wave concentrator and rotator.[8–10] Other than the electromagnetic waves, metamaterials have been created to manipulate other waves such as acoustic waves,[11–13] elastic waves,[14, 15] magnetostatic fields,[16] and static forces.[17] More recently, metamaterials were presented that control the DC current [18–26] and the heat flux.[27–37] However, these devices were designed to cloak an object in a single physical field. Advanced and multifunctional metamaterials are highly desirable for most practical applications. More recently, some attempts to cloak an object in multiple physical fields have been made, in particular, the bifunctional thermalelectric invisibility cloak [38] and independent manipulation [39] were proposed. Later, the first experiment was carried out to simultaneously cloak an air cavity in the electric and thermal fields.[40] This sample was fabricated through a sophisticated man-made metamaterial structure with many holes drilled in a silicon plate that were, then, filled with poly (dimethylsiloxane)(PDMS). In our work, we found that natural materials with simple structure can also simultaneously manipulate multiphysical fields. We fabricated a device that acted as a “mask” for both thermal and electric fields and behaved as a multifunctional invisible sensor.
