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Showing 1 to 20 of 32 for “"sum frequency generation"”.
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Interrogating the Electrochemical Interface Using Sum Frequency Generation Spectroscopy
SFG in tandem with electrochemical capacitance and CV measurements are used to study the effects of applied potential on the adsorption and orientation of PABA at a Ag(111) surface. The data indicates that PABA changes orientation in response to the charge on the electrode surface, orienting one …
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Investigation of chiral porphyrin aggregates with heterodyne-detected vibrational sum frequency generation spectroscopy
… studies. Heterodyne-detected vibrational sum frequency generation (HD-VSFG) spectroscopy is a phase-sensitive, second-order nonlinear technique which probes the vibrational characteristics of noncentrosymmetric molecular environments. HD-VSFG experiments can also probe excitonic and …
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Investigation of Electrode Processes and Double Layer Structure Using Visible/infrared Sum Frequency Generation
The dependence of single crystal Ag azimuthal rotation on resonant SFG signal line shapes is examined using broad band multiplex SFG. Detailed fitting analysis of acquired spectra is used to extract data as a function of azimuthal rotation angle. Magnitude of non-resonant background, relative phase …
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A Study of Molecular Orientation at Neat Liquid-Mica Interface by Sum Frequency Generation (SFG) Spectroscopy
… of studying the interfacial structures, sum frequency generation vibrational spectroscopy shows advantageous to study the solid-liquid interface due to its unique ability in yielding vibrational spectra at such interfaces. Muscovite mica is an important substrate to investigate the ionic …
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Imaging of Heterogeneous Langmuir -Blodgett Monolayer with Compressive Sensing Sum Frequency Generation Microscopy and Brewster Angle Microscopy
The heterogeneity of biological surfaces has been intensively and widely studied and discussed in the last few decades. The membrane of various phospholipid components, as a critical prototype of biological surfaces, can separate into different domains at the air-water interface, with distinct …
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Structural and kinetic studies of surfactant and phospholipid monolayers at the air/liquid interface using sum-frequency generation spectroscopy
In this work, the non-linear optical technique of sum-frequency spectroscopy (SFG) has been used to investigate a variety of surfactant and phospholipid systems at different interfaces. Firstly, the effects of temperature and ionic strength on the adsorption of cationic and non-ionic surfactants …
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Sum Frequency Generation Spectroscopy of Imidazolium-based Ionic Liquids with Cyano-functionalized Anions at Gas-Liquid and Solid-Liquid Interfaces
… The inherently surface-sensitive technique, sum frequency generation (SFG) spectroscopy, in combination with bulk-sensitive vibrational spectroscopic techniques such as FTIR and Raman, have been used in this report to characterize the surface of cyano-containing ILs, such as [BMIM][SCN], …
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Investigation of the ultrafast fiber and hybrid laser systems and their nonlinear wavelength conversion methods in the infrared spectral region /
… are desirable for nonlinear microscopy and sum-frequency generation spectroscopy. The main goal of this thesis was to create and improve the technologies and methods required for the development of effective and reliable laser sources operating in these spectral regions. The thesis consists …
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Design of reversible "smart" surfaces for biomedical and nanotechnological applications
… Monolayers & Surface Characterization A brief summary of the formation, structure, and characterization techniques of self assembled monolayers (SAMs) is described. The characterization techniques include contact angle goniometry, ellipsometry, grazing-angle Fourier-transform infrared …
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Short-visible-wavelength GHz Display
… modulator array with a strong pump beam for sum-frequency generation in a bulk nonlinear crystal. We realize a 4x4 array of amplitude-modulated spots at 420nm with a 3dB bandwidth of 2GHz.
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Environmental Monitoring - using diode-laser-based spectroscopic techniques
… of tunable diode lasers was extended by use of sum-frequency generation. High-resolution ultraviolet spectroscopy of mercury isotopes around 254 nm was performed on low-pressure cells as well as at atmospheric pressure. Ultraviolet radiation around 300 nm, utilized for monitoring of sulfur …
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Functionalization of Surfaces Using Photolithography and Other Techniques
… SAMs. A variety of surface techniques including sum frequency generation and X-ray photoelectron spectroscopy were employed to study these surfaces and ultimately the presence of a multilayer, more than one monolayer, was found.
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Spectroscopic Study of Compressible Mobile Phase and Stationary Phase Behavior in Chromatography
… spectroscopy, laser-induced fluorescence, and sum-frequency generation (SFG) spectroscopy are used to investigate the behavior of compressible mobile phases and stationary phases under a variety of chromatographic conditions. Efforts to understand and optimize separations employing compressible …
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Single-photon frequency upconversion for long-distance quantum teleportation and communication
Entanglement generation, single-photon detection, and frequency translation that preserves the polarization quantum state of the photons are essential technologies for long distance quantum communication protocols. This thesis investigates the application of polarization entanglement to quantum …
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Investigating Complex Organic Species on Mineral Surfaces
… via depletion isotherms, neutron reflectometry, sum-frequency generation and X-ray reflectometry. Stearic acid is shown to adsorb from toluene and can be removed and reapplied. However, in the presence of excess water, stearic acid can be removed from the surface to form calcium stearate.
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Frequency-resolved optical gating in periodically-poled lithium niobate waveguide devices
Frequency-Resolved Optical Gating (FROG) is a well-established and widely-employed technique for the intensity and phase characterisation of ultrashort optical pulses. Essentially, FROG involves mixing an ultrashort optical pulse with its time-delayed replica, or another pulse, in a nonlinear …
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Three dimensional vibrational spectroscopy and shock initiation of hmx
… energy transfer. Laser driven shocks and sum frequency generation spectroscopy were used to attempt to observe the mechanisms of initiation for HMX. Those first bond breaking events are poorly understood, and much could be learned from experimental observation. Much refinement of the …
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Time-Resolved Interactions of Infrared Vibrations and Plasmonic Nanogaps
… Using a custom-built ultrafast microscope setup, sum-frequency generation from individual plasmonic nanocavities uniquely probes the coherent dynamics of collective vibrational modes. These measurements reveal how intermolecular coupling extends vibrational lifetimes by > 200% and protects …
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