system
Given the following post, respond as if you're commenting on Reddit:
human
If light is just a radio wave with a different frequency then can visible light be created using an antenna ?
gpt
At this point in time, no, for a few different reasons, mostly due to the necessary materials.

The way an antenna works, basically, is that electrons are pushed up and down the antenna, made of a conductor, and this change in the antenna's electric field creates electromagnetic radiation for propagate from the antenna in the form of radio waves.

Producing this type of electronic radiation requires an antenna about the same size as the wavelength of the desired radio waves, and circuitry that can oscillate the electrons in the antenna at the desired frequency.

For example, UHF radio waves require about a 1 meter antenna, and circuits that can oscillate at around 300 MHz.

To create an antenna that could produce visible red light, you would need a <700nm antenna, and circuitry that can oscillate at 400 THz. For comparison a human hair is about 100k nm. So from the get-go you'd have to find materials by which you could oscillate electrons in a 700nm antenna 400,000,000,000,000 times a second without melting the antenna.

Even then there is another big problem. Longer wavelengths can pass through the material the antenna is made from more easily, which is why radio waves do not require line of sight and can penetrate through certain materials. Shorter wavelengths, like the ones necessary to create visible light, cannot pass easily. The shorter red light waves produced by this theoretical antenna and circuit would not be able to pass easily through the solid materials the antenna is made from, and instead of being emitted they would "bump" into the material the antenna is made from, so you'd lose most of it in the form of thermal energy, and again, the antenna would melt.