Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 18 of 18 for “"nonlinear spectroscopy"”.
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Fiber Laser Based Nonlinear Spectroscopy
To date, nonlinear spectroscopy has been considered an expensive technique and confined mostly to experimental laboratory settings. Over recent years, optical-fiber lasers that are highly reliable, simple to operate and relatively inexpensive have become commercially available, removing one of the …
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White Light Continuum for Broadband Nonlinear Spectroscopy
… is to develop a WLC for the purpose of broadband nonlinear spectroscopy and use it in spectroscopic measurements. The ability to generate a high-quality, high-spectral-irradiance source of radiation confined in a single beam that spans the visible and near-infrared spectral regimes has great …
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Ultrafast and Nonlinear Spectroscopy of Colloidal Nanomaterials
… second part of this dissertation, the ultrafast spectroscopy of size-selected ([Ru(bipy)3][BETI]2) nanoGUMBPS are reported. The nanoGUMBOS show spectral shifts and size-dependent relaxation dynamics. Long-lived acoustic phonon oscillations with size-dependent frequencies are also observed, where …
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Optical Nanoantennas for Ultrafast Nonlinear Spectroscopy of Individual Nanosystems
Die Arbeit befasst sich mit der ultraschnellen nichtlinearen Dynamik verschiedener Prozesse in individuellen metallischen und halbleitenden Nanostrukturen, ohne die Mittlung über Ensembles. Nanoobjekte mit einer Größe von nur wenigen Nanometern zeigen außergewöhnliche lineare wie auch nichtlineare …
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The generation of high field terahertz radiation and its application in terahertz nonlinear spectroscopy
… enabled time-resolved measurement of ultrafast nonlinear electronic responses in doped bulk semiconductor samples. The ability to spectrally and temporally resolve the response of the semiconductor sample using a THz probe allowed us to uncover both the dynamics of impact ionization and …
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Charge and energy transport in 0D/2D systems probed using linear and nonlinear spectroscopy
… systems. In Chapter 2, low temperature spectroscopy and time-resolved photoluminescence spectroscopy are used to probe the complex energy landscape seen by excitons in acid-treated MoS₂. We show that deeply trapped "dark" exciton states are responsible for the surprisingly long lifetime …
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Hydrogen bonding and solvation dynamics of n-methylacetamide in denatured water (D₂O) or denatured chloroform (CDCl₃) from nonlinear spectroscopy
… was studied by using two-dimensional infrared spectroscopy to probe the frequency fluctuations of the amide I mode of the solvated NMA. An iterative fitting approach was used to extract a correlation function from the experimental data. The correlation function for NMA/D₂O was found to be …
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Generation of high power single-cycle and multiple-cycle terahertz pulses
… This may allow for explorations in coherent nonlinear spectroscopy in the THz region such as the photon echo and multidimensional spectroscopy, revealing novel phenomena in solids, liquids, gases, and complex materials.
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A trajectory-based approach to modeling nonlinear infrared spectra : interrogating strong hydrogen bonds and proton transfer
… approach for modeling linear and nonlinear infrared spectroscopy of condensed phase chemical systems, focusing on applications to strongly hydrogen bonded complexes. To overcome the limitations inherent in common analytical models, I construct full time trajectories for …
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Scaling and Gating Attosecond Pulse Generation
… of applications within imaging, attosecond spectroscopy, and high-precision frequency metrology. However, the rather low efficiency of the HHG process, which implies a limited pulse energy and repetition rate, places restrictions on many applications. In this thesis, the scaling of different …
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Experimental Techniques For Nonlinear Material Characterization: A Nonlinear Spectrometer Using A White-light Continuum Z-scan
… a new method for the rapid determination of the nonlinear absorption spectra and the dispersion of the nonlinear refraction of optical materials in the visible and near IR spectral regions. However, conventional methods like, white-light continuum pump-probe and Z-scan techniques were used to …
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Coherence in nanostructured excitons
… to subsequent function in an excitonic device. Nonlinear spectroscopy offers distinct possibilities for detailed exploration of excitonic properties and processes in nanomaterials. Transient grating experiments are sensitive to population dynamics and energy transport, while multi-dimensional …
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Coherent Terahertz Control and Ultrafast Spectroscopy of Layered Antiferromagnets
… the ongoing effort of developing new ultrafast spectroscopy tools, utilizing them to probe lattice, magnetic, and electronic properties, and gaining active control over them. Specifically, it investigates the induction of a new magnetic state with net magnetization using intense low-energy …
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Single and multi-exciton dynamics in nanoscale semiconductors
… are revolutionizing an array of industries. Nonlinear spectroscopy is a powerful tool for studying the unique optical and electronic properties of these semiconductors. This thesis describes experiments using a unique multi-dimensional spectrometer to study three semiconductors: double-walled …
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Multidimensional Spectra from Classical trajectories
Multidimensional spectroscopy plays an important role in determining the dynamical and structural properties of chemical and biological systems. Exact quantum dynamical calculations for large complex systems are difficult. That opens the window for approximations to quantum dynamics to incorporate …
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Nonlinear Optical Response of Simple Molecules and Two-Photon Semiconductor Lasers
… investigates two long standing issues in nonlinear optics: complete characterization of the ultrafast dynamics of simple molecules, and the potential of a two-photon laser using a bulk semiconductor gain medium. Within the Born-Oppenheimer approximation, nonlinear refraction in molecular …
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Investigation of chiral porphyrin aggregates with heterodyne-detected vibrational sum frequency generation spectroscopy
… 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 vibronic characteristics via experimental …
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In Actu Et In Silicio: Linear and Nonlinear Photophysical Characterization of a Novel Europium Complex, and Incorporating Computational Calculations in the Analysis of Novel Organic Compounds
… the photophysical characterization, linear and nonlinear, of a several novel organic compounds, and a europium complex, as well as using quantum chemical calculation techniques to understand some of the phenomena that are witnessed and begin to develop predictive capability. The nonlinear …