Light is electromagnetic radiation and can be decomposed to a spectrum in which one end contains lower frequencies, thus lower energies, and the other end contains higher frequencies, thus higher energies. Ultraviolet light is on the high-energy end of the visible spectrum, with radiation beyond ~400 nm. The shorter wavelength of UV light allows it to be focused to smaller spots than visible light. Additionally, many materials strongly absorb UV light. These two characteristics combined make UV light ideal for spatially precise light-matter interaction, and enables micro and nanofabrication of fine structures, for example through lithography.