Chalcogenide microresonators tailored to distinct morphologies by the shaping of glasses on silica tapers

Production of chalcogenide (As₂Se₃) microresonators in sphere, loop, and bottle morphologies by the shaping of glasses at appropriate temperatures between cleaved silica tapers is reported. The quality factors exceed Q_S=6.2×10⁵, Q_B=6.7×10⁵, and Q_L=1.6×10⁴ for the sphere, bottle, and loop microresonators, respectively. All-optical thermally assisted tuning with a rate of 0.61 nm/mW is demonstrated for a bottle microcavity pumped via a silica taper at a wavelength of 670 nm. This technique enables practical and robust in situ production of chalcogenide microresonators thermally spliced to silica fibers in several morphologies with a wide tuning range of size.