Active Control Approach to Temporal Acoustic Cloaking

Abstract

We propose a realization of a transformation-based acoustic temporal cloak using an active closed-loop control approach to an equivalent electromagnetic problem. Unlike the more common spatial cloaks the goal of which is hiding fixed objects from detection, the goal of the temporal cloak is hiding the occurrence of events during a finite period of time. In electromagnetic systems, in which events represent, for example, leakage of signals from transmission lines or optical fibers, temporal cloaking solutions usually rely on nonlinear phenomena related to the fibers properties, or on modulating the properties of the propagation medium itself. In particular, the transformation-based solution requires modulating the constitutive parameters of the medium both in space and time. Our control approach is fully linear, where the required change in the medium parameters is programmed into the controllers and created by external actuators in real-time. This cloaking system keeps the physical medium unchanged, and enables to reprogram the cloaking parameters upon request. We demonstrate our solution in a simulation of a one-dimensional water channel.

References in corpus (14)

• Hiding Under the Carpet: a New Strategy for Cloaking
• Dielectric Optical Cloak
• Non-reciprocal phase transitions
• Observation of non-Hermitian topology and its bulk-edge correspondence in an active mechanical metamaterial
• Chiral voltage propagation in a self-calibrated topolectrical Chern circuit
• Demonstration of temporal cloaking
• Non-Hermitian band topology and skin modes in active elastic media
• Reprogrammable plasmonic topological insulators with ultrafast control
• Dynamics and topology of non-Hermitian elastic lattices with non-local feedback control interactions
• Active topolectrical circuits
• Digitally virtualized atoms for acoustic metamaterials
• Temporal cloaking with accelerating wave packets
• Cloaks, editors, and bubbles: applications of spacetime transformation theory
• Finite-Difference Time-Domain simulation of spacetime cloak