Owein Reese

Owein Reese

New York City Metropolitan Area
2K followers 500+ connections

About

Hands on manager and artisan craftsman of code, experienced leading multiple teams of…

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  • Charm.io Graphic

    Charm.io

    New York, United States

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    New York City Metropolitan Area

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    Greater New York City Area

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    New York, New York

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    Greater New York City Area

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    Greater New York City Area

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Education

Publications

  • Raman Scattering from Surface Phonons in Rectangular Cross-Sectional w-ZnS Nanowires

    Nano Letters

    Wurtzite (w-) ZnS nanowires with nearly square cross sections have been grown by pulsed laser vaporization of a (ZnS)0.9Au0.1 target in a flow of Ar 5%H2. Growth proceeds by the vapor−liquid−solid mechanism. Raman scattering from the ZnS nanowires in air at room temperature reveals a strong first-order longitudinal optic (LO) phonon (346 cm-1) and two transverse optic (TO) phonons (269 and 282 cm-1), as well as several second-order features. Peak assignments based on bulk ZnS can be made for…

    Wurtzite (w-) ZnS nanowires with nearly square cross sections have been grown by pulsed laser vaporization of a (ZnS)0.9Au0.1 target in a flow of Ar 5%H2. Growth proceeds by the vapor−liquid−solid mechanism. Raman scattering from the ZnS nanowires in air at room temperature reveals a strong first-order longitudinal optic (LO) phonon (346 cm-1) and two transverse optic (TO) phonons (269 and 282 cm-1), as well as several second-order features. Peak assignments based on bulk ZnS can be made for all the first- and second-order features, except for one band located between the LO and TO bands. This additional Raman band is observed at 335 cm-1 in air, and downshifts to 328 cm-1 in dichloromethane (εm = 2.0) and to 326 cm-1 in aniline (εm = 2.56). This band is therefore assigned to surface optic (SO) phonons. The position of the SO band is consistent with a dielectric continuum model for rectangular cross section wires. A symmetry breaking mechanism which may activate the SO mode is also discussed.

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  • Surface Optical Phonons in a Triaxial Ellipsoidal Quantum Dot

    Physics Review B

    The surface optical phonon eigenmodes in ellipsoidal quantum dots were calculated using the dielectric-continuum model. The problem is exactly solvable in terms of ellipsoidal coordinates and the eigenmodes are written in terms of Lamé polynomials. A study of the mode frequency dependence on the shape of the dots is carried out. This represents a generalization over earlier work on spheres and spheroids. Differences in the results obtained using an optically active and an optically passive host…

    The surface optical phonon eigenmodes in ellipsoidal quantum dots were calculated using the dielectric-continuum model. The problem is exactly solvable in terms of ellipsoidal coordinates and the eigenmodes are written in terms of Lamé polynomials. A study of the mode frequency dependence on the shape of the dots is carried out. This represents a generalization over earlier work on spheres and spheroids. Differences in the results obtained using an optically active and an optically passive host is presented. The size independence of the mode frequencies for a quantum dot of arbitrary shape is proven.

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