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Filtering by: Creator Hill, David Ray Remove constraint Creator: Hill, David Ray Academic Affiliation Physics Remove constraint Academic Affiliation: Physics Non-Academic Affiliation Oregon State University. Undergraduate Research, Scholarship, and the Arts (URSA) Remove constraint Non-Academic Affiliation: Oregon State University. Undergraduate Research, Scholarship, and the Arts (URSA)

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  • Bandgap measurements of nonspecular materials using a bifurcated fiber optic method of diffuse reflectance

    Creator:
    Wells, Blake
    Abstract:
    A method for determining bandgap energy using diffuse reflection is presented. The method uses bifurcated fiber optic cables to measure the diffuse reflection of diffusely reflective materials. The absorption spectrum is extrapolated from the diffuse reflection spectrum and used to determine the bandgap of powdered materials. The theory of nonspecular...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    Blake Wells Oregon State University Department of Physics Advisor: Dr. David McIntyre 2015

  • Optical Tweezer Trapping of Colloidal Polystyrene and Silica Microspheres

    Creator:
    Peters, Kyle C.
    Abstract:
    Optical trapping is a tool used throughout a wide variety of disciplines rang- ing from precisely probing and manipulating sub-micron organisms in biol- ogy to analyzing fundamental charge transfer in colloidal physics. This thesis presents research involving optical tweezer force measurements of polystyrene and silica microspheres. In addition, preliminary work...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    Trapping 5 2.1 Geometric (ray) Optics Model: Mie Regime (d��) . . . . . . 5 2.2 Rayleigh Regime (d