Passive reflective tracking media compositions and methods for covertly tracking objects

摘要

A passive reflective tracking media includes a plurality of multi-layer particles including at least one layer of a high refractive index material and at least one layer of a low refractive index material. The particles are configured to reflect ambient electromagnetic radiation at one or more signature wavelengths. Methods of applying the tracking media to a target object, detecting the tracking media, and fabrication the tracking media are also described.