Temporal Cloak without Synchronization

TL;DR

This paper introduces a novel temporal cloaking method using the temporal Talbot effect that eliminates the need for synchronization, enabling invisibility of intensity-modulated events and advancing secure communication technologies.

Contribution

It presents a new scheme for temporal cloaking based on the temporal Talbot effect, removing synchronization requirements and demonstrating cloaking for various signal types.

Findings

Successful realization of temporal cloak for periodic signals

Effective cloaking of pseudo-random signals

Higher order Talbot effect improves cloaking performance

Abstract

Considered to only exist in the fairy tales in the past, invisibility cloaks have been successively converted into reality no matter in the spatial domain or temporal domain. Inspired by the spatial cloaking, time gaps are utilized to hide temporal events. However, a sophisticated synchronization for cloaking is indispensable in these cloaking techniques, therefore leaving inconvenience for the realization of the temporal cloak. Here, by exploiting temporal Talbot effect, we propose a brand new scheme and concept to achieve a temporal cloak without any synchronization for cloaking process, under which the intensity-modulated event is directly turned into invisibility in intensity through temporal averaging effect induced by the Talbot effect. We successfully realize temporal cloak for periodic and pseudo-random signals respectively. We also find that the higher order temporal Talbot effect is beneficial to cloaking performance. Moreover, it is feasible to recover the data from the intensity-cloaked waveform. This method and its concept render a distinct perspective for temporal cloak, extend temporal cloak to the pulsed-wave and promote the development of confidential communication.