Journal
MICROMACHINES
Volume 5, Issue 3, Pages 457-471Publisher
MDPI
DOI: 10.3390/mi5030457
Keywords
microlens; microfluidic; laser; PMMA; lab-on-a-chip; optics
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Funding
- Engineering and Physical Sciences Research Council [EP/H03014X/1] Funding Source: researchfish
- EPSRC [EP/H03014X/1] Funding Source: UKRI
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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 mu m 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.
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