How EUV Lithography Works—and Why One Company Controls It

The Light That Makes Modern Chips Possible

Every advanced processor powering smartphones, AI servers, and self-driving cars owes its existence to a single technology: extreme ultraviolet (EUV) lithography. This manufacturing process uses light with a wavelength of just 13.5 nanometers—more than 14 times shorter than its predecessor—to etch transistor patterns so small that millions fit on a grain of sand.

Only one company in the world builds the machines capable of this feat: ASML, a Dutch firm headquartered in Veldhoven, Netherlands. Its monopoly is not the result of patents or market manipulation, but of engineering so extraordinarily difficult that no competitor has managed to replicate it in over three decades of trying.

Turning Molten Tin Into Starlight

At the heart of every EUV machine is a light source unlike anything else in industrial manufacturing. Tiny droplets of molten tin are fired into a vacuum chamber at a rate of 50,000 per second. Each droplet is struck by two consecutive pulses from a high-power CO₂ laser. The first pulse flattens the droplet; the second vaporizes it into a plasma heated to nearly 220,000 °C—roughly 40 times the temperature of the sun's surface.

This superheated tin plasma emits extreme ultraviolet light at exactly 13.5 nm. The light is then collected by ultra-precise mirrors and directed through a mask—a blueprint of the chip circuit—which projects a shrunken pattern onto a silicon wafer coated with light-sensitive material. The result: transistor features smaller than four nanometers across.

Because EUV light is absorbed by virtually everything, including air and glass, the entire optical path must operate in a near-perfect vacuum, and all the optics are reflective mirrors rather than traditional lenses. These mirrors, manufactured by Germany's Zeiss, must be polished to atomic-level smoothness—a process that took 15 years to perfect.

Why Nobody Else Can Build These Machines

An EUV lithography system contains over 100,000 components sourced from more than 800 suppliers worldwide. Each machine is so large it requires three Boeing 747 cargo jets to transport, costs upward of $200 million, and produces up to 200 wafers per hour.

The barriers to competition are staggering. ASML invested more than 30 years and billions of dollars in research, collaborating closely with partners like Zeiss for optics and TRUMPF for laser systems. Competitors Nikon and Canon, once serious contenders in lithography, never bridged the gap to EUV. Even with unlimited funding, replicating ASML's accumulated knowledge—dead ends discovered and avoided, supplier relationships refined over decades—remains practically impossible.

As Georgetown University's Center for Security and Emerging Technology has documented, the technology's emergence depended on a unique constellation of government-funded research, cross-border collaboration, and sustained private investment that would be extraordinarily difficult to reproduce.

The Next Frontier: High-NA

ASML is already pushing beyond current EUV with High-NA (numerical aperture) systems. These next-generation machines increase the numerical aperture from 0.33 to 0.55, enabling resolution of just 8 nanometers and transistor densities nearly three times higher than current systems. Each High-NA machine costs roughly $400 million.

Intel has installed the industry's first commercial High-NA tool, the Twinscan EXE:5200B, for developing its 14A fabrication process. TSMC and Samsung are ramping their own installations, with mass production expected in 2027–28.

A Geopolitical Chokepoint

ASML's monopoly has turned EUV lithography into one of the world's most potent geopolitical chokepoints. The United States and its allies have restricted the export of advanced lithography equipment to China, effectively limiting Beijing's ability to manufacture cutting-edge chips domestically. China has reportedly been developing its own EUV prototype, but analysts estimate it remains years behind ASML's current generation—let alone High-NA.

For now, every company that designs the world's most advanced semiconductors—from Apple to Nvidia—depends on machines built in a single Dutch factory. In the global race for technological supremacy, EUV lithography is the bottleneck through which everything must pass.