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Micromachines 2014, 5(4), 825-838; doi:10.3390/mi5040825

Compact Birefringent Waveplates Photo-Induced in Silica by Femtosecond Laser

Institut de Chimie Moléculaire et des Matériaux d'Orsay, UMR CNRS-UPSud 8182, Université de Paris Sud 11, Bâtiment 410, Orsay 91405, France
interdisciplinary Photonic Laboratories (iPL), School of Chemistry, The University of Sydney, Sydney, NSW 2006, Australia
Author to whom correspondence should be addressed.
Received: 21 August 2014 / Revised: 25 September 2014 / Accepted: 26 September 2014 / Published: 30 September 2014
(This article belongs to the Special Issue Laser Micro- and Nano- Processing)
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Recently, we showed that femtosecond laser induced “nanogratings” consist of thin regions with a low refractive index (Δn = −0.15), due to the formation of nanoporous silica surrounded by regions with a positive index change. In this paper, we investigate a wide range of laser parameters to achieve very high retardance within a single layer; as much as 350 nm at λ = 546 nm but also to minimize the competing losses. We show that the total retardance depends on the number of layers present and can be accumulated in the direction of laser propagation to values higher than 1600 nm. This opens the door to using these nanostructures as refined building blocks for novel optical elements based on strong retardance. View Full-Text
Keywords: silica; ultrafast processes in condensed matter; laser-induced chemistry; femtosecond phenomena silica; ultrafast processes in condensed matter; laser-induced chemistry; femtosecond phenomena

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lancry, M.; Desmarchelier, R.; Cook, K.; Poumellec, B.; Canning, J. Compact Birefringent Waveplates Photo-Induced in Silica by Femtosecond Laser. Micromachines 2014, 5, 825-838.

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