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We report a novel technique for launching broadband laser light intoliquid-filled hollow-core photonic crystal fiber (HC-PCF). It uniquely offersself-alignment and self-stabilization via optomechanical trapping of a fusedsilica nanospike, fabricated by thermally tapering and chemically etching asingle mode fiber into a tip diameter of 350 nm. We show that a trapping laser,delivering ~300 mW at 1064 nm, can be used to optically align and stablymaintain the nanospike at the core center. Once this is done, a broadbandsupercontinuum beam (~575 to 1064 nm) can be efficiently and close toachromatically launched in the HC-PCF. The system is robust against liquid-flowin either direction inside the HC-PCF and the Fresnel back-reflections arereduced to negligible levels compared to free-space launching or butt-coupling.The results are of potential relevance for any application where the efficientdelivery of broadband light into liquid-core waveguides is desired.

Broadband, Lensless and Optomechanically Stabilised Coupling into Microfluidic Hollow-Core Photonic Crystal Fiber Using Glass Nanospike