Fabrication of polymer-based reflowed microlenses on optical fibre with control of focal length using differential coating technique |
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Authors: | Mohammed Ashraf Franck Chollet Murukeshan Matham Chun Yang |
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Affiliation: | (1) Department of Mechanical Engineering, Louisiana State University, Baton Rouge, LA 70803, USA; |
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Abstract: | Thermal reflow of polymer to generate spherical profile has been used to fabricate microlenses in this paper. A simple model
based on the volume conservation (before and after reflow) and geometrical consideration of lens profile, shows that the focal
length of the microlens produced by reflow technique is a function of the initial geometry of microcylinders, i.e. diameter
and thickness. This relationship of focal length with diameter and thickness is used as a basis to control focal length. A
simple spin coating technique on dual surface is used to achieve differential thickness, to control the focal length of microlenses
produced on the same substrate. A biomedical application of such combination of microlenses is endoscopy where the lenses
of varying diameter and equal focal length are needed on top of optical fibre bundles to provide independent function of illumination
and imaging. This paper incorporates the differential thickness technique to show a micro fabrication process to produce the
polymer reflowed microlenses, with a control of focal length based on thickness. The design also helps to integrate these
microlenses on top an optical fibre with accurate alignment. |
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