CO2 Laser Manufacturing of Miniaturised Lenses for Lab-on-a-Chip Systems

This article describes the manufacturing and characterisation of plano-convex miniaturised lenses using a CO2 laser engraving process in PMMA substrates. The technique allows for lenses to be fabricated rapidly and in a reproducible manner at depths of over 200 µm and for lens diameters of more than...

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Bibliographic Details
Published in:Micromachines (Basel) 2014-09, Vol.5 (3), p.457-471
Main Authors: Mohammed, Mazher-Iqbal, Desmulliez, Marc
Format: Article
Language:English
Subjects:
lab-on-a-chip
laser
microfluidic
microlens
optics
PMMA
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Summary:This article describes the manufacturing and characterisation of plano-convex miniaturised lenses using a CO2 laser engraving process in PMMA substrates. The technique allows for lenses to be fabricated rapidly and in a reproducible manner at depths of over 200 µm and for lens diameters of more than 3 mm. Experimental characterisation of the lens focal lengths shows good correlation with theory. The plano-convex lenses have been successfully embedded into capillary microfluidic systems alongside planar microlenses, allowing for a significant reduction of ancillary optics without a loss of detection sensitivity when performing fluorescence measurements. Such technology provides a significant step forward towards the portability of fluorescence- or luminescence-based systems for biological/chemical analysis.
ISSN:2072-666X
2072-666X
DOI:10.3390/mi5030457