An antenna can theoretically emit light since both light and radio waves are electromagnetic (EM) waves, but practical implementation poses challenges due to the small wavelength of light. For instance, a full-wave antenna for red light at 694nm would be too small to be visible, complicating design and functionality. The concept suggests creating an array of metallic light-emitting antennas similar to computer chips, but efficiency compared to LEDs remains uncertain. Additionally, the discussion raises the question of whether lasers are more efficient than LEDs in converting electricity to light. Overall, while the idea is intriguing, significant engineering challenges and efficiency comparisons need to be addressed.
