Cavity Microball Lenses: Femtosecond Laser Fabrication of Cavity Microball Lens (CMBL) inside a PMMA Substrate for Super-Wide Angle Imaging (Small 25/2015)

A simple and innovative scheme to fabricate a completely enclosed cavity microball lens (CMBL) inside a polymer substrate is devised by A. Hu, T. Chen, and co-workers, using a femtosecond fiber laser at high repetition rates. On page 3007, the fabricated CMBL turns out to be a highly transparent, crack-free structure with low internal surface roughness, allowing its use as a high-quality optical component in super wide angle imaging.