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 20 of 478 for “"Ultrafast"”.
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Towards ultrafast quantum processing: generation and storage of ultrafast photonic quantum states
This thesis is divided into five parts, each with an accompanying publication. In Chapter 1, I motivate the broad scientific pursuit that underlies this thesis: the quest to build universal, fault-tolerant technology that operates on the principles of quantum mechanics and quantum information …
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Ultrafast Broadband Terahertz Spectroscopy
This dissertation centers on broadband terahertz spectroscopy and is arranged in four main sections. In the first section, we describe terahertz generation from a two-color laser air breakdown plasma. This is modeled with a plasma current that includes plasma density and dispersion in propagation. …
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Adaptively shaped advanced ultrafast laser sources
… is to investigate adaptively shaped advanced ultrafast laser sources in the near-(NIR) and the mid-infrared (MIR) regimes. The setup involves shaping a NIR pulse using an adaptively controlled liquid crystal spatial light modulator (LC-SLM) in a pulse shaper. The shaped NIR pulse is then …
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Ultrafast dynamics of [NiFe] hydrogenase models
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2027-05-01
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Ultrafast Ultra-confined Plasmon Phonon Interactions
… and interrogating nanometrically confined ultrafast plasmon-phonon interactions. Nanometric plasmonic confinement is achieved by coupling the charge oscillations of a single gold nanoparticle to a gold substrate. This confines the plasmonic field to the single nanometre gap separating the two …
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Ultrafast Raman Scattering in Plasmonic Nanocavities
When bound to metals, molecular vibrations play a key role in sensing, catalysis, molecular electronics and beyond, but investigating their coherence and dynamics is difficult as pulsed experiments prove very challenging. In this thesis, I study vibrations of 1-1000 molecules in a plasmonic …
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Ultrafast dynamics of Fullerene thin films
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Ultrafast Atomic Dynamics in Arbitrary Light Fields
… R-matrix with time-dependence (RMT) theory for ultrafast atomic processes in arbitrarily polarised laser fields is described. The theory is applicable to multielectron atoms and atomic ions subject to ultrashort laser pulses with any given ellipticity, and generalises previous time-dependent …
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Ultrafast and Nonlinear Spectroscopy of Colloidal Nanomaterials
… absorption is also used to investigate the ultrafast excited-state relaxation dynamics of the different dyes adsorbed on the core-shell-shell surface and the size-dependent dynamics o interfacial charge transfer between the gold nanoclusters and the TiO2 bandgap in TiO2-Au nanocomposites. In …
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Ultrafast studies of diffusion and electron transfer
Picosecond flash photolysis is used to study the recombination of carbon monoxide to protoheme in glycerol:water over ten decades in time (1 ps to 10 ms). The rebinding consists of an initial nonexponential geminate phase followed by a slower exponential bimolecular phase. The entire time course of …
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Innovations in three-dimensional ultrafast ultrasound imaging
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01
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Shaped ultrafast optical pumping for NMR applications
Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2002.
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Strong-field physics with ultrafast optical resonators
… fields are generally achieved with amplified, ultrafast laser pulses. In this thesis we explore phenomena unique to strong-fields by using optical resonators to passively enhance ultrafast laser pulses. We pursue two major themes in the area of ultrafast resonator-enhanced strong-field physics. …
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Heterogeneous Ultrafast Energy Transfer in Photosynthetic Proteins
… experiments to measure rates relied on ensemble ultrafast spectroscopy, which is limited to average values. With single-molecule approaches, we can overcome the limitations of ensemble averaging by measuring individual proteins. However, single-molecule experiments have been primarily restricted …
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Ultrafast 2D IR spectroscopy of membrane peptide systems
Plasma membranes are the main liaisons between the intercellular and extracellular environment, playing a critical role in numerous biological processes. Recent research has challenged the long-standing "fluid mosaic model," representing membranes as densely packed, heterogeneous environments. …
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Ultrafast infrared spectroscopy investigation of DNA-ligand interactions
Two-dimensional infrared spectroscopy (2D-IR) is a label-free analysis method that can provide structural insight into biological processes by uncovering the coupling between the intrinsic, vibrational modes of a molecule. Technological advancements in the last decade have drastically reduced …
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Ultrafast Ionisation Dynamics Induced by Short Proton Pulses
… by the multi-component structure of the glass. Ultrafast pulsed-ion radiolysis is performed on H2O to investigate the formation of solvated electrons. Significant delay in the formation of these aqueous electrons is observed to occur under proton irradiation compared to X-rays/electrons. …
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