In situ fabricated 3D micro-lenses for photonic integrated circuits

Opt Express. 2018 May 14;26(10):13436-13442. doi: 10.1364/OE.26.013436.

Abstract

Aspheric astigmatic polymer micro-lenses were fabricated directly onto photonic integrated circuits using two-photon lithography. We observed a 12.6 dB improvement in the free space coupling efficiency between integrated ridge laser pairs with micro-lenses to those without.