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We report the onset of lasing from an electrodynamically trapped ZnO tetrapod. Each of the four legs of such an isolated tetrapod behaves as a single nanowire, where light is guided along the length of the wire and the necessary resonant feedback for lasing is provided at the two end facets. A diluted solution of ZnO tetrapods in methanol was sprayed in the form of a charged mist into a chamber containing...
We report room-temperature, low threshold, multi- and single mode lasing in levitated microdrops doped with low concentrations of CdSe/ZnS core/shell quantum dots.
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.
Spherical microcavities doped with semiconductor nanocrystal quantum dots (QDs) have been extensively studied for their fundamental optical properties and for their potential in application such as biolabeling and telecommunications. The spherical microcavities provide a strong 3-dimensional resonant feedback system with a high Q and small mode volume. QDs have tunable emission properties and high...
We measured the self-phase modulation spectra at the output of deep-etched AlGaAs waveguides. The light source was an OPO laser system providing 250fs long pulses, at wavelengths around 1520nm, with a peak power as high as 1kW. FROG measurements of the OPO pulses reveal their asymmetric shape. The multi-peak spectra, observed at the waveguide output, show a dramatic asymmetry and a power shift towards...
Nonlinear switching of an optical pulse through a defect state in a one dimensional photonic microstructured AlGaAs waveguide is observed. This effect is attributed to self-phase modulation of the input spectrum in the initial part of the waveguide.
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