Equation 12 · Patterning at the Limit: What Actually Happens When a Chip Is Manufactured
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There are only three levers, and two of them are nearly exhausted. Wavelength went 436, 365, 248, 193 nm and then stopped. Numerical aperture rose past 1.0 only because immersion lithography put water between the final lens and the wafer, and the refractive index of water caps the useful aperture near 1.35 — a figure ASML calls the highest in the industry for its current 193 nm immersion platform, quoting production resolutions down to 40 nm with quadrupole illumination and 38 nm with dipole [ 8 ] . Substitute the vendor’s own numbers back into the relation and the implied is about 0.27, within a few per cent of the two-beam floor. There is nothing meaningful left to extract from that…
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There are only three levers, and two of them are nearly exhausted. Wavelength went 436, 365, 248, 193 nm and then stopped. Numerical aperture rose past 1.0 only because immersion lithography put water between the final lens and the wafer, and the refractive index of water caps the useful aperture near 1.35 — a figure ASML calls the highest in the industry for its current 193 nm immersion platform, quoting production resolutions down to 40 nm with quadrupole illumination and 38 nm with dipole [ 8 ] . Substitute the vendor’s own numbers back into the relation and the implied is about 0.27, within a few per cent of the two-beam floor. There is nothing meaningful left to extract from that configuration. Below roughly 38 nm in a single exposure, either the wavelength changes or the pattern is built from more than one exposure.
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