Etching of fused silica fiber by metallic laser-induced backside wet etching technique

► Fused silica fiber was etched by metallic laser-induced backside wet etching method. ► We studied the progress of the etching, the surface morphology of the etched fiber tip. ► The etched surfaces were porous; it contains sub-100 nm spherical structures. ► Preliminary study was carried out to ascertain the application possibilities of processed fibers.