Engraving machine 3 nm refers to:
The key size of node technology, and this size is not the geometric size that the chip can see with the naked eye (generally millimeter to centimeter level), but generally refers to the gate length (gate length). This length is determined by the size defined on the mask plate, and is determined by the lithography machine in the production process (of course, it can be achieved with the support of photoresist, corrosion and other technologies).
The \"nanometer\" in the photolithographic nanomachine refers to the product line width (process size). That is, the chip line size processed by the lithography machine can reach the nanometer order, that is, 10^(-19)m, such as the 5nm process, 7nm process and 14nm process in the CPU. The frequency of light is generally several hundred nanometers, such as the wavelength range of visible light is generally 400nm~700nm.
The lithography machine 3 nanometers is about 20,000 times smaller than a human hair.