Abstract

In this Letter, we first proposed a new technology to prepare protruding-shaped ${\mathrm{SiO}}_2$-microtips (PSSMs): transient spinning technology (TST). By designing the operation steps and controlling the discharge parameters of a fiber splicing machine (Furukawa S178a), the protruding-shaped ${\mathrm{SiO}}_2$-microtips with different structural parameters can be fabricated simply, quickly, and efficiently. Two kinds of microtip photonic devices were designed: (1) a high-sensitivity gas refractive index Mach–Zehnder interferometer sensor based on the coned microtip and (2) an efficient ${\mathrm{LP}}_{11}$-mode selective exciter based on the lensed microtip. Furthermore, the PSSMs have more potential applications, such as optical fiber tweezers, optical fiber Raman probes, and scanning near-field optical microscopy.

© 2019 Optical Society of America

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