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Traditional low-refraction-index devices are usually supported by a pedestals, introducing an extra air layer compared with real on-chip devices, which cannot meet the demand of optical interconnection. In this work, we proposed and experimentally demonstrated silica microtoroids bonded on high-refractive-index silicon substrate realizing good light confinement [1]. With proper microtoroid minor diameter,...
We experimentally realized on-chip deformed microcavities supporting both highly unidirectional emission and ultrahigh Q factors exceeding 108. This type of microcavity holds potential in ultralow-threshold laser and sensitive nanoparticle detection.
We report single nanoparticle detection using mode splitting of the microcavity Raman lasers. Using this method, single polystyrene (PS) nanoparticle down to 20 nm in radius in an aqueous environment is realized.
We observed ultralow-threshold Raman lasing using direct free-space excitation of whispering gallery modes in a deformed microtoroid. This simple and robust excitation method can overcome the inadequacies of taper coupling.
By coating a layer of polydimethylsiloxane (PDMS) on the silica microcavity surface, we observe the Raman laser emission from PDMS, which is to our knowledge the first demonstration of polymer cavity Raman laser.
We report for the first time an alternative way to detect the mode splitting in a silica microcavity through measuring the heterodyne beat note signal of a Raman laser mode.
We experimentally report a novel asymmetrical spherical microcavity with thermal-induced deformation, in which whispering gallery modes possess not only ultra-high quality factors (Q) but also remarkably directional escape emission from the microsphere boundary.
We developed a new method to fabricate a silica microsphere coated by a thin layer of Er : Yb-doped phosphate glass. The coated microsphere possessed high-Q whispering-gallery modes and formed single-mode and multimode microlasers in the both 1550- and 1040-nm bands. A low-loss fiber taper was used to not only launch the pump power around 980 nm into the microsphere, but also collect the resulting...
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