Hwang, JoonhyukKim, Dae-GonHan, SangyoonJeong, DonginLee, Yong HeeChoi, Duk-YongLee, Hansuek2023-02-260146-9592http://hdl.handle.net/1885/286418We report a supercontinuum generation (SCG) in a waveguide that spontaneously forms without an etching process during the deposition of a core material on a preformed SiO substructure. The mechanism of dispersion control for this new, to the best of our knowledge, type of waveguide is analyzed by numerical simulation, which results in a design rule to achieve a target dispersion profile by adjusting the substructure geometry. SCG is experimentally demonstrated with a waveguide made of As S , chalcogenide glass, which has low material absorption over the mid-IR range. A dispersion-controlled waveguide with a length of 10 mm pumped with 77 pJ pulses at a telecommunication wavelength of 1560 nm resulted in a supercontinuum that extends by more than 1.5 octaves. 2 2 3National Research Foundation of Korea (2020R1A2C1008292, 2020R1A4A2002828); Samsung Research Funding & Incubation Center of Samsung Electronics (SRFC-IT1801-03)application/pdfen-AU© 2021 The authors202110.1364/OL.4226062021-12-19