e-beam mask writer

**E-Beam Mask Writer** is the **primary mask writing technology using a focused electron beam to expose resist on mask blanks** — the electron beam can be shaped into variable-sized rectangles (VSB — Variable Shaped Beam) to write the mask pattern with sub-nanometer placement accuracy. **VSB E-Beam Writer** - **Beam Shaping**: Two square apertures overlap to create a variable-sized rectangular beam — adjustable shot size. - **Shot Size**: Typical shot sizes from 0.1 µm to 4 µm — larger shots for large features, smaller for fine details. - **Placement**: Sub-nm beam placement accuracy — controlled by electrostatic correction and laser interferometry. - **Dose Control**: Per-shot dose modulation for proximity effect correction — compensate for electron scattering. **Why It Matters** - **Industry Standard**: VSB e-beam writers (NuFlare, JEOL) are the workhorses of mask manufacturing. - **Write Time**: Serial writing means write time scales with shot count — 10-24 hours for advanced masks. - **Resolution**: <10nm resolution on mask (2.5nm on wafer at 4× reduction) — sufficient for current nodes. **E-Beam Mask Writer** is **the electron pencil for masks** — using a precisely shaped electron beam to inscribe nanoscale patterns onto photomask blanks.