Y. Mizuno et al., Proc. SPIE 12898, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XVII, 128980R (13 March 2024)
3D-printed lens by two photon polymerization is promising technology in the filed of optics thanks to its free-form writing with sub-micron accuracy. However, reflection loss on the lens surface is problematic due to Fresnel reflection. In order to solve the problem, we have demonstrated a 3D-printed aspherical lens with moth-eye anti-reflection structure. An aspherical lens with submicron stripe was printed on fiber end face. Reflectance on the lens surface was reduced from 4.4% to 0.005% at 1550 nm wavelength, and furthermore, coupling efficiency to another fiber is improved from -0.52 dB to -0.33 dB thanks to the reduction of Fresnel reflection.
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