Journal
OPTICAL MATERIALS EXPRESS
Volume 3, Issue 10, Pages 1674-1686Publisher
OPTICAL SOC AMER
DOI: 10.1364/OME.3.001674
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Funding
- Australian Research Council [DP120102980, DP130101205]
- European Social Fund Agency [VP1-3.1-SMM-10-V-02-007]
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We report fabrication of sub-100 nm resolution structures by ablation on the surface of sapphire using femtosecond laser pulses. A single 50-70 nm wide groove was recorded by laser ablation via a controlled ripple formation on the surface. Ripples are created by breakdown due to a sphere-to-plane formation of an ionisation below surface in a similar way as the bulk ripples. Different thresholds for the ripples formed parallel and perpendicular to direction of the laser scan were observed. In a sol-gel photo-polymer SZ2080 and thermo-polymer polydimethylsiloxane, free-standing 3D structures were formed without use of two-photon absorbing photo-sensitizers. Both cases of the surface and bulk structuring were achieved via a controlled avalanche, which dominated ionisation of materials. (C) 2013 Optical Society of America
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