The “diffraction limit” has always posed a challenge to physicists. This limit is essentially brought upon by the law of physics that makes lenses used to direct light beams unable to focus on a spot having a diameter of less than half the light’s wavelength. It was easy enough for physicists to get around it inside their laboratories but proved much more complicated when sought for more practical use.
The creation of light-focusing optical antennas to be used on commercially available laser makes the dream of one DVD-like disc the equivalent of more than 750 recordable DVDs in terms of data storage a possibility. It is good that the antenna does not impose any design constraints. This technology would be of special interest to storage-device companies.