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Proceedings Paper

Photonic jet to improve the lateral resolution of laser etching
Author(s): Andri Abdurrochman; Sylvain Lecler; Joël Fontaine; Frédéric Mermet; Patrick Meyrueis; Bernard Y. Tumbelaka; Paul Montgomery
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Paper Abstract

The techniques applying laser beams or optical systems are limited by the diffraction limit of the optical heads used. We demonstrate theoretically and experimentally that the use of the photonic jet allows an improvement in the optical resolution to achieve smaller etching without reducing the wavelength of the source. The potential of the photonic jet using a nanosecond pulsed near-infrared laser for micro-fabrication is also demonstrated. These lasers are the most common type of laser used in industrial processes because of their price and the fact that well-packaged sources are available. Their typical spatial resolution in laser etching is limited by the spot size of their focus point at around 25-70 μm. This is the reason why a photonic jet, a high spatial concentration onto a half-wavelength spot of a beam that emerges in the vicinity of a dielectric microsphere, is of great interest. In our experiments, micro-scale glass (ns = 1.5) and BaTiO3 spheres (ns = 1.9) have been used to achieve photonic jets. The etching process has been tested on two substrates: silicon wafers, which have a significant absorption at 1064 nm, and glass plates, which have a lower absorption at this wavelength. The smallest marking achieved on silicon has an average diameter of 1.3 μm and despite the low absorption, micrometric etchings have also been achieved on glass using larger microspheres.

Paper Details

Date Published: 1 May 2014
PDF: 11 pages
Proc. SPIE 9135, Laser Sources and Applications II, 913523 (1 May 2014); doi: 10.1117/12.2052718
Show Author Affiliations
Andri Abdurrochman, ICube, Univ. de Strasbourg (France)
Univ. Padjadjaran (Indonesia)
Sylvain Lecler, ICube, Univ. de Strasbourg (France)
Joël Fontaine, ICube, INSA de Strasbourg (France)
Frédéric Mermet, IREPA LASER (France)
Patrick Meyrueis, ICube, Univ. de Strasbourg (France)
Bernard Y. Tumbelaka, Univ. Padjadjaran (Indonesia)
Paul Montgomery, ICube, Univ. de Strasbourg (France)


Published in SPIE Proceedings Vol. 9135:
Laser Sources and Applications II
Jacob I. Mackenzie; Helena JelÍnková; Takunori Taira; Marwan Abdou Ahmed, Editor(s)

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