Abstract
When using ultra-short laser pulses it is possible to machine areas smaller than the focal spot by restricting the threshold light intensity to the centre of the spot. However, even smaller and cleaner features can be achieved by utilising a sacrificial material on top of the layer being machined. In particular, we have found that features can be reduced by up to a factor of two and the heat-affected-zone by a factor of three in polymers. These results have implications for improved fabrication of fluid and gas delivery systems and optical devices such as photonic crystals and related devices.When using ultra-short laser pulses it is possible to machine areas smaller than the focal spot by restricting the threshold light intensity to the centre of the spot. However, even smaller and cleaner features can be achieved by utilising a sacrificial material on top of the layer being machined. In particular, we have found that features can be reduced by up to a factor of two and the heat-affected-zone by a factor of three in polymers. These results have implications for improved fabrication of fluid and gas delivery systems and optical devices such as photonic crystals and related devices.
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