On-chip hollow-core waveguides represent a promising platform for microfluidic analysis, nonlinear optics and quantum information processing, due to light guidance directly inside the medium of interest. Recently, we have introduced two types of 3D nanoprinted on-chip hollow-core waveguides, namely the hollow-core light cage and the microgap waveguide which have unique properties for on-chip sensing. Here we will present our results for water-based spectroscopy, refractive index sensing, nanoparticle tracking, and optical fiber interfacing.
On-chip hollow-core waveguides represent a promising platform for microfluidic analysis, nonlinear optics and quantum information processing, due to light guidance directly inside the medium of interest. Recently, we have reported a 3D printed hollow-core waveguide ⎯ light cage ⎯ which consists of a ring of high-aspect-ratio cylinders and combines a high fraction of field in the core (>99%) with transverse access. Here we will discuss our results on interfacing light cages with optical fibers, the measurement of electromagnetically induced transparency within light cages filled with alkali vapour, the potential of the light cage concept for spectroscopy and nanoparticle tracking analysis.
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