Light-wave antenna: Is it a simple extension of optical telescopes?

Optical antennas or light-wave antennas have partly similarities and differences with optical telescopes and radio-wave antennas, respectively. This paper first describes the features of light-wave antennas and seeks for the direction of their R&D in the future. Then, the research works that we achieved in laboratory so far will be explained. Those results are expected to bridge the gap between the light-wave antennas and both of light-wave application systems and radio-wave antennas.