An energy source completely devoid of external radiation has been created Physics

An energy source completely devoid of external radiation has been created

To develop a non-emitting dynamic source of electromagnetic waves, scientists for the first time proposed a meta—atom based on the anapole effect - when waves that emit electric currents of different configurations are the same in amplitude, but opposite in phase. Thus, they suppress each other in the far zone. The problem is to obtain configurations corresponding to the anapole in the required spectral range for the emitting structure, because previously this problem was solved only in the context of light scattering by nanoparticles in photonics.

My colleagues and I suggested that based on the anapol effect, it is possible to create a meta-atom that would not radiate energy to the far zone and allow all electromagnetic energy to be concentrated in its near zone. With a certain configuration of the components of the source, it is possible to ensure that the waves emitted by different parts compensate for each other in the far wave zone and thereby suppress the total radiation," explains Esmail Zanganeh, a graduate student of the New ITMO University Physics Department and one of the authors of the work published in the journal Physical Review Letters.

In the study, scientists examined two types of structure of non-emitting sources with the anapol effect. As scientists explain, two variants of the structure are suitable for different applications, depending on which type of fields is preferred in the source area — electric or magnetic. Super-compact non-emitting sources can be widely used to create highly efficient wireless power transmission systems, contactless chargers, high-precision RF sensors, sensors, chips and tags, as well as medical devices.

The material was provided by the ITMO press service