Fabrication of Three-dimensional microlenses using hydrophilic confinement and self-surface tension
Date Issued
2014
Date
2014
Author(s)
Chiang, Cheng-Han
Abstract
In this thesis we demonstrated a novel design and fabrication processes of convex and concave microlenses on top of light emitting diodes by using hydrophilic confinement effect and a 3D-printer. We used energy conservation and lawnmower algorithm to design a freeform lens and transform the freeform surface into heterogeneous microlenses. The diameters of microlenses on top of a light emitting diode are 500μm and 200μm for concave and convex shapes, respectively. We made heterogeneous microlenses using hydrophilic confinement effect of the SU-8 photoresist by an inkjet printer on a glass substrate. Then we assembled it with a mold made by a 3D-printer to perform replication process. In the replication process, we filled polydimethylsiloxane (PDMS) into the mold to reproduce heterogeneous microlenses. This heterogeneous microlens array can improve the light distribution uniformity of light-emitting diode from 30% to 70%.
Subjects
microlens
hydrophilicity
hydrophilic
confinement
inkjet printing
SDGs
Type
thesis
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