We demonstrate the concept of vertically standing arc waveguides to couple normally incident light into the plane of a photonic circuit or sensor array. The simple one-step direct write fabrication uses a low power picosecond microchip laser for two-photon polymerization with high-speed and low-cost. Arc waveguides with different arc radii and waveguide port diameters are obtained, with insertion loss down to 1.5 dB. This demonstration of a distinctly different architecture employing unsupported arc waveguides adds another dimension to photonic integration and opens up applications for environmental sensors, integrated microfluidics, bio-assay chips, as well as offering an alternate way of input/output-coupling to planar waveguides.

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