Equation 2 · Part 1 · Patterning at the Limit: What Actually Happens When a Chip Is Manufactured
Symbol λ
What this part means
the exposure wavelength, is the numerical aperture of the projection optics.
Its job in the formula
λ is a part of this expression. Its role is fixed by the surrounding article and by the operations shown in the formula.
Full expression→Symbol λ→Article meaning
Where the article explains it
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.
The passage around this formula
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.
Learn the underlying idea
A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.
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Sources cited in the article section
- [1] International Roadmap for Devices and Systems 2023 Update: Lithography and Patterning ↗
- [8] TWINSCAN NXT:2050i ↗
These citations provide research context; check each source for the exact claim it supports.