HIGHLIGHTS
SUMMARY
To tackle these limitations, the authors propose the manipulation of Janus particles (here, silica microspheres halfcoated with gold) by optical forces in the evanescent field of an optical nanofiber. The authors find that Janus particles exhibit strong transverse localization on the nanofiber and much faster propulsion compared to all-dielectric particles of the same size. After early tests in optical tweezers14, it was soon realised that JPs with metallic parts are very hard to handle by light, because the high reflectance and absorbance of the metal lead to strong optical and thermal forces repelling . . .
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