“…None the less, for the past two decades the use of double negative materials has been investigated for a vast number of applications including super-resolution for nano-scale object imaging, [15]- [17], microwave imaging, [18]- [21], object cloaking and insulating, [22], manufacturing electronic sensors, [23], bio-medicine and biomedical imaging, [24], [25], as well as recent applications such as optical computing [26] and energy harvesting [27]. The concept has even been extended to that of heat conduction, [28].…”