Fig. 1: Schematic of optical condensation with optical fibre module and images of optical fibre module.

a Overview. b Top-view. c Side-view. Optical transmission image of the optical fibre module (d) before ion sputtering; (e) after ion sputtering. The scale bars in (d, e) are 75 μm. Scanning electron microscopy (SEM) image of the optical fibre module (f) after ion sputtering; g captured with a stage tilted at 30°. The scale bars in (f, g) are 20 μm.