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  • 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:
    , 126(19):194503–194503, 2007. iii iv electrophoresis experiments designed to track the movement of

  • Optical Development and Materials Applications of Tunable Femtosecond Stimulated Raman Spectroscopy

    Creator:
    Zhu, Liangdong
    Abstract:
    To obtain a mechanistic understanding of the chemical processes, techniques that offer a frame-by-frame visualization of molecular structure during a reaction are of vital importance. Numerous efforts and advances have been made in order to acquire such vivid molecular “movies”, especially in the electronic excited state. Ultrafast molecular spectroscopy method...
    Resource Type:
    Dissertation
    Full Text:
    Thin Film by Femtosecond Laser Spectroscopy ............................ 126 7.1 Abstract

  • Molecular Dynamics on REX-GECO1 Reveal Structural Features Governing Fluorescence

    Creator:
    Rozanov, Nikita
    Abstract:
    Fluorescent proteins have emerged as an essential toolset for bioimaging, creating a demand for engineering proteins with new and improved fluorescent properties. In this thesis, I explore the atomistic structure of REX-GECO1, a newly engineered protein biosensor that has unique optical properties. Since this protein has no available crystal structure,...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    time step is set to 2 fs, along with a rigid constraint on all bonds using the SHAKE algorithm. In

  • Study of Organic Semiconductors Using Time-Resolved Charge Measurements at the Microscale

    Creator:
    Wallace, Richard
    Abstract:
    Understanding charge transfer in organic semiconductors is important for developing devices like organic light emitting diodes and flexible electronics. Optical tweezers have been used in many disciplines for trapping, manipulating, and analyzing microscopic objects such as microspheres, micro-organisms, and other colloidal particles. Using optical tweezers, studies have measured the average...
    Resource Type:
    Undergraduate Thesis
    Full Text:
    -spring system and can be described using Hooke’s Law. (See figure 2.1) Fs = −ks~r Here ks is the force

  • Interlayer Electronic Interactions in Twisted and Stacked Bilayer Graphene

    Creator:
    Patel, Hiral
    Abstract:
    The photophysical properties of two-dimensional (2D) layered van der Waals (vdW) materials, and their heterostructures are manifestly distinct from crystalline bulk materials. Recently, the discovery of new 2D vdW materials and strongly-bound interlayer excitons in these materials has created a new branch in nanoscience. As such, there are a number...
    Resource Type:
    Dissertation
    Full Text:
    ...................................................................................................... 126 6.2.1 Introduction

  • Terahertz Induced Non-linear Electron Dynamics in Nanoantenna Coated Semiconductors at the Sub-picosecond Timescale

    Creator:
    Stickel, Andrew
    Abstract:
    This dissertation is an exploration of the material response to Terahertz (THz) radiation. Specifically we will explore the ultrafast electron dynamics in the nonperturbative regime in semiconductors that have been patterned with nanoantenna arrays using broadband, high intensity, THz radiation. Three main semiconductor materials will be studied in this work....
    Resource Type:
    Dissertation
    Full Text:
    incident THz powers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126 5.22 Total relative

  • Search for Non-Einsteinian Polarization Modes in the Gravitational-Wave Background using NANOGrav’s 12.5 Year Data Set

    Creator:
    Laal, Nima
    Abstract:
    I led a collaborative project involving a search for an evidence of a gravitational wave background (GWB) with all the spatial correlations allowed by general metric theories of gravity using NANOGrav’s 12.5 year data set. The search found no substantial evidence in favor of the existence of such correlations. The...
    Resource Type:
    Masters Thesis

  • Terahertz Imaging and Nonlinear Spectroscopy of Semiconductors using Plasmonic Devices

    Creator:
    Thompson, Zachary James
    Abstract:
    In this dissertation, a series of studies in the field of terahertz (THz) science are presented, specifically using nonlinear THz spectroscopy. We exploit huge field enhancement and subwavelength confinement in plasmonic structures. There are three distinct projects which will be discussed: nonlinear THz spectroscopy using plasmonic induced transparency (PIT), THz-triggered...
    Resource Type:
    Dissertation

  • Electronic and Optical Properties of Organic Semiconductors : Experiment and Simulation

    Creator:
    Johnson, Brian
    Abstract:
    The continued development of organic semiconductor materials relies on an understanding of the relationship between optoelectronic properties, molecular structure, and molecular interaction. Several detailed studies of electronic properties in functionalized polyacene materials are presented. A computational model which allows the extraction of charge generation and transport properties from experimental data...
    Resource Type:
    Dissertation
    Full Text:
    the bandgap. This state decays within the first ∼100 fs after excitation, into a ground state

  • SpaceLab, an N-Body Particle-Particle Ballistic Collision Simulation Tool with Applications in Celestial Body Dynamics

    Creator:
    Guidos, Job
    Abstract:
    This thesis conveys the key technical features and scientific applications of a particle-particle ballistic simulation tool (SpaceLab) as well as a high level overview of experiments it was designed for and executed on. SpaceLab simulates spherical particle interactions under any combination of self-gravity, sliding friction, rolling friction, Van-Der-Waals (VDW) cohesion...
    Resource Type:
    Masters Thesis
    Full Text:
    repulsion, F⃗s = −k Ri + Rj − ||r⃗ij|| j r̂ (3.6) where ||r⃗ij|| is the distance between particles i and