Symbol λ
the exposure wavelength, is the numerical aperture of the projection optics.
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Why this formula appears here
where is the exposure wavelength, is the numerical aperture of the projection optics, and is a dimensionless process factor absorbing illumination scheme, mask engineering and resist behaviour. Two-beam interference sets a hard floor: for a periodic line-and-space pattern the smallest printable half-pitch is / (2\,) , which is = 0.25 in the convention where R is a half-pitch. Everything the industry calls resolution enhancement — off-axis illumination, phase shifting, optical proximity correction, inverse lithography — is an attempt to drive down toward that floor without printing garbage.
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Equation 5 · AI Hardware & Semiconductors
Patterning at the Limit: What Actually Happens When a Chip Is Manufactured
This mathematical expression combines the displayed quantities; its precise role follows from the surrounding article text.
where is the exposure wavelength, is the numerical aperture of the projection optics, and is a dimensionless process factor absorbing illumination scheme, mask engineering and resist behaviour. Two-beam interference sets a hard floor: for a periodic line-and-space pattern the smallest printable half-pitch is / (2\,) , which is = 0.25 in the convention where R is a half-pitch. Everything the industry calls resolution enhancement — off-axis illumination, phase shifting, optical proximity correction, inverse lithography — is an attempt to drive down toward that floor without printing garbage.