Patent ID: 11961708
Assignee: NUFLARE TECHNOLOGY, INC.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A charged particle beam writing apparatus that writes a pattern on a substrate on a stage by causing a deflector to deflect a charged particle beam, the charged particle beam writing apparatus comprising:
a pattern-density distribution calculator virtually dividing a writing region of the substrate in a mesh-like manner and calculating a pattern density distribution indicating an arrangement ratio of the pattern for each mesh region;
a dose distribution calculator calculating a dose distribution indicating a dose for each mesh region using the pattern density distribution;
an exposure-amount distribution calculator calculating an exposure amount distribution of the charged particle beam, which is emitted from an emitter and to which the substrate is exposed, using the pattern density distribution and the dose distribution;
a fogging charged particle amount distribution calculator calculating a plurality of fogging charged particle amount distributions by convoluting each of a plurality of distribution functions for fogging charged particles with the exposure amount distribution, the plurality of distribution functions having different distribution centers and radius of influence of a fogging effect from each other;
a charge-amount distribution calculator calculating a charge amount distribution due to direct charge using the pattern density distribution, the dose distribution, and the exposure amount distribution, and calculating a plurality of charge amount distributions due to fogging charge using the plurality of fogging charged particle amount distributions;
a position shift amount calculator calculating a position shift amount of a writing position based on the charge amount distribution due to direct charge and the plurality of charge amount distributions due to fogging charge;
a corrector correcting an exposure position using the position shift amount; and
a writer exposing the corrected exposure position to a charged particle beam.