Fabrication and characterization of on-chip optical nonlinear chalcogenide nanofiber devices

Chalcogenide (As₂S₃) nanofibers as narrow as 200 nm in diameter are drawn by the fiber pulling method, are successfully embedded in SU8 polymer, and form on-chip waveguides and high-Q microknot resonators (Q = 3:9 × 10⁴) with smooth cleaved end faces. Resonance tuning of resonators is realized by localized laser irradiation. Strong supercontinuum generation with a bandwidth of 500 nm is achieved in a 7-cm-long on-chip chalcogenide wave-guide. Our result provides a method for the development of compact, high-optical-quality, and robust photonic devices.