Compact column design for a focused ion-beam lithography system

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Abstract
A focused ion beam system using a multicusp plasma ion source and an all-electrostatic accelerator column design is being investigated for maskless direct-write lithography processes. The all-electrostatic accelerator column is very compact with a total length of 3 cm. It consists of an extraction lens, a collimator aperture, a focusing lens and a deflector. Ion beam transport code IGUN and charged particle optics design software (Munro's code) are used to analyze and optimize the performance of the accelerator column. The column can accelerate an 0.1 (mu) A O2+ ion beam to about 1 keV and focus it down to 0.2 micrometer spot size. Both axial and deflection aberration of the beam are investigated using the OPTICS and SOFEM packages of Munro's code.

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