A new method to fabricate high-quality fibre probes for scanning near-field optical microscopes by pre-treating the fibre before chemical etching was proposed and implemented. In the pre-treating process, the diameter of the fibre is reduced to a range of 7 -20 mum by etching one end of the fibre in the HF solution and a taper angle is formed simultaneously. Then the tapered part of the fibre is coated with a thick layer of plastic film and etched in the HF solution again. High-quality probes are obtained with an apex diameter as low as approximately 20 nm and a large cone angle.
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Yang et al. (2007) studied this question.
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