Abstract
Focused ion beams with varied exposure dose were used to mill rectangular trenches into PMMA on SiO2. The dose response was investigated by atomic force microscopy measurements. TRIM calculations were used to simulate the ion distributions and damages expected inside the target. The depth of the trenches measured by AFM showed an unexpected decrease for intermediate dosages of high energetic helium ions in contrast to low energetic helium and nitrogen ions. This has been attributed to the formation of metastable blisters in the PMMA layer.
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