Parity-time-symmetric teleportation

Abstract

We show that electromagnetic plane waves can be fully "teleported" through thin, nearly fully reflective sheets, assisted by a pair of parity-time-symmetric lossy and active sheets in front and behind the screen. The proposed structure is able to almost perfectly absorb incident waves over a wide range of frequency and incidence angles, while waves having a specific frequency and incidence angle are replicated behind the structure in sync with the input signal. It is shown that the proposed structure can be designed to teleport waves at any desired frequency and incidence angle. Furthermore, we generalize the proposed concept to the case of teleportation of electromagnetic waves over electrically long distances, enabling full absorption at one surface and the synthesis of the same signal at another point located electrically far away from the first surface. The physical principle behind this selective teleportation is discussed, and similarities and differences with tunneling and cloaking concepts based on PT -symmetry are investigated. From the application point of view, the proposed structure works as an extremely selective filter, both in frequency and spatial domains.

Nonscattering Metasurface-Bound Cavities for Field Localization, Enhancement, and Suppression

“…This relation between the grid impedances implies that if one metasurface is lossy, then the second one should be pumped with external energy to compensate the power dissipated in the lossy sheet. In the limiting case of active/lossy metasurface combination, when the impedances Z e1 = R e and Z e2 = −R e are purely real, the cavity behaves as a teleportation slab with parity-time symmetry [45]. However, for practical implementations of the structure, it is desirable to use purely imaginary grid impedances (using easily realizable capacitive and inductive metasurfaces), which is the case when dissipation is negligible (influence of inevitable small losses on the cavity performance is elucidated below).…”

Electromagnetic Impurity-Immunity Induced by Parity-Time Symmetry

“…Many intriguing phenomena have been discovered, such as power oscillations [31][32][33], coherent perfect absorption and lasing [34][35][36][37][38], unidirectional transparency [39][40][41][42][43], etc. More recently, the concept of PT symmetry has been introduced in metasurfaces [55][56][57], which renders many exciting novel phenomena such as active negative refraction and imaging [46][47][48][49], unidirectional cloaking [50], electromagnetic teleportation [51], etc.…”

Unidirectional invisibility induced by parity-time symmetric circuit

“…1(c). Under the perfect reflection of the reactance component, the attractive performance of the proposed circuit presents replicating the input signal in synchronization behind the structure24. More specifically, at the spontaneous PT-symmetry breaking point, the reflection from one end of the circuit is diminished while it is enhanced from the other, and the transmission coefficient is nearly unitary which presents the unidirectional invisibility, as shown in Fig.…”

“…The optical systems present reflectionless around the Bragg resonance at the one side, and enhanced reflectivity from the other side contrarily15. Furthermore, when the lossy and active sheets are inserted in front and behind the almost fully reflective sheets, the incident waves are replicated behind the PT-symmetric structure in synchronization with the input signal24. Based on the effective-mapping image between the quantum and the classical mechanism, the circuit and the microwave system can be devoted to the PT-symmetry devices in theory and experiment2526.…”