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.
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Schmidt et al. (2024) studied this question.
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