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Microlens arrays
Further information on UV cured microlens arrays
UV
cured microlens arrays are very useful for a wide range of applications.
The UV cured polymer resin is highly transparent for visible and near
infra-red wavelengths and has good chemical resistance. The microlenses
can be made onto glass, including very thin glass (0.3 mm) for applications
where the back focal plane of the lens array needs to be at the back surface
of the glass substrate. Further generic properties of the replica lens
arrays are given below.
| Material
type
|
acrylate
photopolymer resin |
| Appearance
|
clear |
| Form
|
thin
film |
| Glass
transition temperature
|
80°C |
| Water
Uptake (24 hrs in water)
|
0.09% |
| Thermal
expansion
|
100
x 10-6 K-1 |
| Good
adhesion to
|
glass,
quartz, polycarbonate |
| Optical
transparency
|
See
spectra |
| Refractive
index
|
See
dispersion graph. 1.50 at 633 nm. |
| Vickers
Hardness
|
8 |
| Climate
resistance |
No
change after 20 hrs at 95oC/98% humidity or 1 week at 70oC/98% humidity |
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