Issue 11, 2013

Simple and easily controllable parabolic-shaped microlenses printed on polymeric mesas

Abstract

A simple and easy shape-controllable approach is demonstrated for the fabrication of parabolic-shaped polymer microlenses (μ-lenses), which are widely used in bio-imaging systems such as microfluidic and lab-on-a-chip systems for improving the image quality due to their ability to efficiently focus light into the devices. The μ-lenses were printed directly on micro-structured polymeric SU-8 mesas and they were formed on these mesas using a photo-curable organic–inorganic hybrid material (H-resist) using a drop-on-demand (DOD) ink-jet printing technique. The parabolic-shape μ-lenses with a fixed diameter resulting from the micro-structured SU-8 mesas are controlled by surface wetting conditions (i.e., the comparison between hydrophobic and hydrophilic) that efficiently improve the boundary confinement effect, and by printing different numbers of drops per μ-lens. The influence of the geometrical changes on the optical properties is also investigated. The high numerical aperture (NA) parabolic-shaped μ-lenses controlled by the hydrophobic surface-treated micro-structured polymeric SU-8 mesas, which are able to confine the drops at the edge, can be integrated on a microfluidic system and they allow high resolution image quality.

Graphical abstract: Simple and easily controllable parabolic-shaped microlenses printed on polymeric mesas

Article information

Article type
Paper
Submitted
15 Nov 2012
Accepted
21 Jan 2013
First published
21 Jan 2013

J. Mater. Chem. C, 2013,1, 2152-2157

Simple and easily controllable parabolic-shaped microlenses printed on polymeric mesas

J. Y. Kim, C. Martin-Olmos, N. S. Baek and J. Brugger, J. Mater. Chem. C, 2013, 1, 2152 DOI: 10.1039/C3TC00632H

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