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We show that trench defect in a photonic crystal slab leads to efficient wave-guiding. Based on trench-waveguide geometry, slow-light devices and coupled-cavity micro-resonator arrays can be fabricated with scalable (holographic) photolithography avoiding electron-beam lithography.
Splitting of mode wavelength and loss are observed in coupled photonic-crystal cavities. The characteristics of loss splitting are shown to have important impact on the optical energy transfer between such coupled resonators.
We report room-temperature Raman lasing in electrodynamically levitated pure glycerin microdrops. The possibility of lowering the lasing threshold through surface plasmon enhanced scattering in glycerin microdrops doped with Ag nanoparticles is also demonstrated.
We explore thermal effects in a rare-earth doped glass microsphere resonator arising from internal heating of the cavity via pump intensity. This has facilitated the fabrication of an integrated coupler plus source for L-band lasing.
We measured second harmonic generation in the whispering gallery modes of a microspherical cavity from a monolayer of nonlinear molecules on the sphere surface. Such monolayer is placed with the appropriate configuration for phase matching.
We report the fabrication and characterization of identical dielectric whispering gallery microcavites for teraherz (THz) radiation. The THz radiation is coupled via a tapered waveguide into the coupled cavities. Mode splitting is observed.
General theoretical principles for bistability in microlasers are formulated. Bistable lasing is reported between modes with similar spatial intensity profiles in coupled microcavities, allowing wavelength switching by several nanometers on an ultrafast, picosecond time scale.
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