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Ridge waveguides were 3D printed using a stereolithography 3D printer and hydrogel resin formulation. The ridge waveguides were 13, 20 and 30 μm wide, 3-6 μm high and 4.4 mm long. The loss of the waveguides was measured using the cutback method and ranged between 0.28 and 1.2/cm (or 1.2 and 5.2 dB/cm) with transmittances up to 0.94 using 635 nm light. This work demonstrates a quick and inexpensive method to fabricate integrated photonic chips with the promise to fabricate more complex photonic devices.
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Helio Ramollari, Philip Measor, "A low-loss 3D printed ridge waveguide via stereolithography," Proc. SPIE 12004, Integrated Optics: Devices, Materials, and Technologies XXVI, 120040S (5 March 2022); https://doi.org/10.1117/12.2607839