Just as radio antennas amplify signals from cell phones and televisions, the same principle can be applied to light. This work could lead, in the long term, to the development of more efficient light-emitting diodes and cells. more compact plots; or even be used in quantum cryptography.
Since light is a wave, it should be possible to develop optical antennas capable of amplifying light signals in the same way that televisions and mobile phones capture radio waves. However, since light oscillates a million times faster than radio waves, extremely small objects, nano-sized (nm), are necessary to capture such fast light waves. Therefore, the optical equivalent of an elemental antenna (of the dipole type) is a quantum emitter surrounded by two particles one thousand times smaller than a human hair.