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Title: Surface nanostructuring by femtosecond laser irradiation through near-field scanning optical microscopy
Authors: Lin, Y. 
Hong, M.H. 
Wang, W.J.
Wang, Z.B.
Chen, G.X. 
Xie, Q.
Tan, L.S. 
Chong, T.C. 
Keywords: Bethe-Bouwkamp model
Femtosecond laser
Near-field scanning optical microscopy
Issue Date: 12-Feb-2007
Citation: Lin, Y., Hong, M.H., Wang, W.J., Wang, Z.B., Chen, G.X., Xie, Q., Tan, L.S., Chong, T.C. (2007-02-12). Surface nanostructuring by femtosecond laser irradiation through near-field scanning optical microscopy. Sensors and Actuators, A: Physical 133 (2 SPEC. ISS.) : 311-316. ScholarBank@NUS Repository.
Abstract: A near-field scanning optical microscopy (NSOM) and a double-frequency femtosecond laser (400 nm, 100 fs) were applied to push the optical resolution further down to sub-50 nm on thin UV photoresist. A 20-nm feature size can be obtained. It is at a resolution of λ/20 (λ: laser wavelength) and a/2 (a: NSOM probe aperture diameter), respectively. It is proved that laser power and exposure time can affect feature size of lithography patterns. In this paper, the effect of probe-to-sample distance on dot-pattern features is studied, and different dot-pattern shapes are generated: dumbbell-dot, ellipsoid-dot and circle-dot. The simulated light field spatial distributions across the nano-aperture based on Bethe-Bouwkamp model is found to agree with experimental results very well. © 2006 Elsevier B.V. All rights reserved.
Source Title: Sensors and Actuators, A: Physical
ISSN: 09244247
DOI: 10.1016/j.sna.2006.05.047
Appears in Collections:Staff Publications

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