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- W4298325625 abstract "In this work, we demonstrated the application of femtosecond laser direct writing using the two-photon polymerization (TPP) technique in the fabrication of single-mode optical waveguide in SU-8 photoresist. It was found that the polymerization of SU-8 using 780 nm femtosecond laser requires a fluence of 1.8–10 kJ/cm 2 , where 2.5 kJ/cm 2 is sufficient to create a flat-top surface waveguide for a 1.8 µm thick SU-8 film. To reduce the coupling loss of the waveguide, the waveguide width was enlarged with double scan of the femtosecond laser by shifting the sample laterally with a center-to-center spacing of 0.5 µm between scans. The optimized waveguide has an insertion loss of 11 dB, with an approximated propagation loss of 1.27 dB/cm. Based on the information obtained, a directional coupler was fabricated. The resulting coupling ratio of the directional coupler is 47 % and 53 % at each port. To further demonstrate the viability of the proposed technique to fabricate complex waveguide structures, a vertically suspended waveguide has been designed and fabricated." @default.
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- W4298325625 date "2022-11-01" @default.
- W4298325625 modified "2023-09-26" @default.
- W4298325625 title "Single-mode SU-8 waveguide fabricated using ultrafast direct laser writing" @default.
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- W4298325625 doi "https://doi.org/10.1016/j.ijleo.2022.170068" @default.
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