The science of creating elliptically polarized light According to the researchers, twisted light can be produced using the same technology as the 100-year-old Edison bulb (filament light bulb) ...

This twisted wire illustrates how the filament in the Edison bulb is twisted, but at a micro-scale – when the light's wavelength matches the length of the twist, the lightwaves twirl as they go ...

This is a video recording of Francis Jehl discussing his experience working with Thomas Edison in 1879 and helping to make the first practically viable light bulb in history.