NICOP - DOPPLER CLOAK: MAKING MOVING OBJECTS INVISIBLE
Abstract
Invisibility cloaks have been deeply investigated in the last 10-12 years and may have a dramatic impact inmany military and civil applications. There exist many different approaches to electromagnetic invisibility andall of them have advantages and disadvantag"es. Fundamental limitations of passive cloaks have been alsoinvestigated, showing that the operation bandwidth of a cloak is limite""d for a given invisibility level. In real-lifeapplications, thus, the operation bandwidth of passive cloaks is rather limited and t""his makes cloaked movingobjects visible. When an impinging electromagnetic wave of a given frequency hits a moving object, in fact,"" thefield scattered/reflected by the object is affected by the Doppler frequency shift. Therefore, if the moving objectis cloaked"" with conventional techniques (based on the fact that the object is at rest), the scattered fieldfrequency may lay outside the freq""uency operation bandwidth of the cloak and, thus, the object may becomeagain visible. In order to make moving objects truly invisib""le, thus, we propose using a special cloak made by aspatio-temporally modulated artificial material resulting in a non-reciprocal i""nteraction with the impingingelectromagnetic field. The objective of this project, thus, is to explore this idea and develop an ad" hoc designtechnique to implement the Doppler cloak. This idea may find many applications in both military and civilscenarios.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Sep 01, 2017
- Source ID
- N629091712099
Entities
People
- Alessandro Toscano
Organizations
- Office of Naval Research
- United States Navy