We discuss the mechanism for cloaking or hiding of objects from detection by probing with electromagnetic waves using the mechanism of anomalous localized resonance, also called reactive cloaking to distinguish it from the alternative method based on transformation optics or refraction. We highlight the requirements for this type of cloaking, and compare them with those of refractive cloaking. We discuss the challenge common to both methods of achieving cloaking over extended spectral ranges and spatial regions, and possible ways of meeting the challenge.

联系人：精仪系：李立峰教授