Aktaş, O.Bayındır, Mehmet2018-04-122018-04-1220171559-128Xhttp://hdl.handle.net/11693/37038We report production of air-clad tapered chalcogenide fibers by directly drawing bulk glasses between cleaved tips of tapered silica fibers. Exploiting these tapered fibers with nanoscale waists as evanescent optical couplers, we demonstrate phase-matched coupling of light into on-chip whispering gallery mode chalcogenide microresonators with coupling efficiencies as high as 95%. To the best of our knowledge, this is the first-time demonstration of critical coupling into high-index microresonators by using high-index tapered fibers. The tapered chalcogenide fibers can also be utilized as optical couplers for microresonators made of various high-index materials, as well as for nonlinear optical applications.EnglishChalcogenidesFibersGlassNanotechnologyOptical fibersPhase matchingResonatorsWhispering gallery modesChalcogenide fibersCoupling efficiencyCritical couplingDirectly drawingHigh index materialsMicro resonatorsNonlinear optical applicationsPhase-matched couplingNonlinear opticsArticle10.1364/AO.56.0003852155-3165