Compound Optical Film Using Gray Scale Mask Embedded with Microvoids

<table>The PDMS optical film of no. D20-B microlens array (a) the first scale (34 <i>μ</i>m), (b) the second scale (23 <i>μ</i>m), (c) the third scale (13 <i>μ</i>m), and (d) the forth scale (6 <i>μ</i>m).</table>

Advances in Condensed Matter Physics

fig20

Figure 20

Figure 20: Compound Optical Film Using Gray Scale Mask Embedded with Microvoids 