According to scientists, in an optical diode, the light input in one direction is transmitted while the light input in the opposite direction is blocked. This new optical diode, designed by Lan Yang and her team is reportedly made from parity-time (PT) symmetric micro-resonators in which loss of one of the resonators is balanced by the gain in the other.

When the rate of gain in one resonator exactly equals that of loss in the other, the phase transition occurs at a critical coupling distance between the resonators.

Simply put, when a lossy system is coupled with a gain system such that loss of energy exactly equals gain at an equilibrium point, a phase transition occurs.

According to sources, this diode is capable of completely eliminating light transmission in one direction and greatly enhancing light transmission in the other nonreciprocal light transmission.

The researchers believe that the discovery of this new optical diode will benefit many other fields involving electronics, acoustics, plasmonics and meta-materials.