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

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Zeltner,  Richard
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Xie,  Shangran
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Pennetta,  Riccardo
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

/persons/resource/persons201171

Russell,  Philip St J.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Zeltner, R., Xie, S., Pennetta, R., & Russell, P. S. J. (2017). Broadband, Lensless, and Optomechanically Stabilized Coupling into Microfluidic Hollow-Core Photonic Crystal Fiber Using Glass Nanospike. ACS PHOTONICS, 4(2), 378-383. doi:10.1021/acsphotonics.6b00868.


Cite as: https://hdl.handle.net/21.11116/0000-0000-7DED-A
Abstract
We report a novel technique for launching broadband laser light into liquid-filled hollow-core photonic crystal fiber (HC-PCF). It uniquely offers self alignment and self-stabilization via optomechanical trapping of a,fused silica nanospike, fabricated by thermally tapering and chemically etching a single mode fiber into a tip diameter of 350 nm. We show that a trapping laser, deliirering similar to 300 mW at 1064 nm, can be used to optically align and stably maintain the iianospike at the core center. Once this is done, a weak broadband supercontinuum signal (similar to 575-1064 nm) can be efficiently and close to achromatically launched in the HC-PCF. The system is robust against liquid-flow in either direction inside the HC-PCF, and the Fresnel back-reflections are reduced to negligible levels compared to free-space launching or butt-coupling. The results are of potential relevance for any application where the efficient delivery of broadband light into liquid-core waveguides is desired.