Perfect cylindrical cloak under gyration, non-inertial effects make perfect cloak visible

Abstract

For the first time, electromagnetic wave interaction with a perfect non-inertial cloak is investigated. The electromagnetic detection of an ideal gyrating cloak, the effect of rotational speed on the scattering pattern, and the determination of rotational direction and rotational velocity magnitude are investigated in the present paper. It is shown that a rotating cloak is electromagnetically detectable due to the magneto-electric and Sagnac effects. These phenomena create bending in the passing wave pattern and generate cylindrical wavelets that are observable in the electromagnetic scattering pattern. It is shown, the gyrating cloak’s speed and direction can be determined using the amplitude of wavelets and bending location in the pulses passed because they increase with growing angular frequency. At low frequency gyration, the distortion of waveform pattern is humble and negligible; however, when the rotational frequency increases, the pattern distortion becomes huge, wavelets are formed, and their intensity grows. The direction of rotation can influence the scattering pattern; thus, the rotation direction could be identified with the scattering pattern analysis. The simulation is computed using the FDTD method by transforming Maxwell’s equations from the non-inertial framework to the lab framework.

KEYWORDS:

• Cloaking
• non-inertial
• Sagnac effect
• magneto-electric effects
• transformation optics

Disclosure statement

No potential conflict of interest was reported by the author(s).