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.
Results
Showing 1 to 20 of 20 for “"Spontaneous Raman"”.
-
MONITORING PHONON DYNAMICS IN QUANTUM MATERIALS BY TIME-RESOLVED SPONTANEOUS RAMAN SCATTERING
… quantum materials, employing time-resolved spontaneous Raman spectroscopy (TRRS) as the primary experimental approach. Among ultrafast spectroscopies, TRRS provides unique access to phonons and other low-energy excitations in systems impulsively driven into transient non-equilibrium states, …
-
Spontaneous Raman spectroscopy: Exploring applicability in drug discovery and the medical sciences
This thesis reports the investigation of spontaneous Raman Spectroscopy (RS) for its applicability in early drug discovery. A key focus has been to develop an understanding of the applicability of RS for the quantification and localisation of compound concentration inside mammalian cells. Further …
-
Enhancement and extinction effects in surface-enhanced stimulated Raman spectroscopy
Surface-enhanced Raman spectroscopy (SERS) is a technique that allows one to probe the vibrational modes of molecules with great precision. However, current methods involve the enhancement of local fields from spontaneous Raman scattering near a metallic substrate. By utilizing stimulated Raman …
-
Nonlinear interferometric vibrational imaging for applications in the study and diagnosis of breast cancer
… its diagnosis in early stages of development. Spontaneous Raman scattering microscopy studies on human breast pathologies have led to models that characterize normal and cancerous breast tissue. This technique, however, is weak and requires long integration times, making it problematic as a …
-
Raman Spectroscopy Of Glasseswith High And Broad Raman Gain In The Boson Peak Region
This thesis investigates Raman spectra of novel glasses and their correlation with structure for Raman gain applications. Raman gain for all-optical amplification by fibers depends significantly on the cross section for spontaneous Raman scattering allowing to compare signal strength and spectral …
-
Coherent anti-Stokes Raman spectroscopy of diamond
… performed to investigate Coherent Anti-Stokes Raman Scattering (CARS) in diamond. Aspects of this type of non-linear scattering are presented theoretically, and various experimental configurations were attempted in order to study them. These included the dependence of the CARS signal intensity …
-
Discrete frequency chemical imaging with stimulated Raman scattering microscopy
… dissolved analyte in a fluidic system. Coherent Raman scattering (CRS) spectroscopies have gained increasing attention in recent years, as they represent a class of techniques which affords high-resolution, z-stack capable, not-perturbative, rapid chemical imaging. Stimulated Raman scattering …
-
Investigation of single-frequency high-power Raman fiber amplifier for guide star application
… of power scaling of core-pumped single-frequency Raman fiber amplifiers operating at 1178 nm. A numerical model was developed that accounts for stimulated Raman scattering (SRS) and stimulated Brillouin scattering (SBS) in relation to the fiber mode field diameter, length, seed power, and …
-
Development of "Core-Suction" Technique for Fabrication of Highly Doped Fibers for Optical Amplification and Characterization of Optical Fibers for Raman Amplification
… doped fibers (HDFs) for optical amplification (Raman effect based or Erbium fiber based). The technique involves drawing the molten non-conventional core glass material into the silica cladding tube to form the preform. The developed technique is simple, inexpensive and shows great potential for …
-
Flame stabilization and mixing characteristics in a stagnation point reverse flow combustor
… OH PLIF, chemiluminescence imaging, PIV and Spontaneous Raman Scattering. Results indicate that the combustor is primarily stabilized in a region downstream of the injector that is characterized by low average velocities and high turbulence levels; this is also the region where most of the …
-
High Gain / Broadband Oxide Glasses For Next Generation Raman Amplifiers
Interest in Raman amplification has undergone a revival due to the rapidly increasing bandwidth requirements for communications transmission, both for long haul and local area networks, and recent developments in the telecom fiber industry and diode laser technology. In contrast to rare earth doped …
-
Utilizing Raman spectroscopy and multivariate analysis to identify and monitor the differentiation states of individual stem cells
… presented herein investigates the potential of spontaneous Raman microspectroscopy as an objective, non-invasive, marker-free, quantitative technique to chemically characterize and identify individual cells, specifically stem cells and their progeny, with location and time specificity. Chapter 1 …
-
Laseroptische Untersuchungen des Verbrennungsprozesses in einem PKW-Dieselmotor
… the late mixture-controlled combustion phase the Spontaneous Raman Scattering (SRS) could be applied successfully for determination of temperature and mole fraction distribution of oxygen and carbon dioxide above the piston bowl. From the results it can be reasoned, that soot emissions must …
-
Quantum applications of Raman-mediated photon-pair generation
… and linear optics quantum computing. Raman scattering is one of the most fundamental light-matter interactions and can be used to generate photon pairs. Using the spontaneous Stokes Raman interaction, a photon from a strong pump laser pulse is annihilated, and a Stokes photon and …
-
Development and Application of Gas-phase Raman Spectroscopy Techniques for Analysis of Carbon Nanotube Synthesis Processes
… of synthesis parameters. In this study, two Raman-based spectroscopic techniques were tested for the realisation of in situ measurements in a FC-CVD reactor. Cavity-enhanced Raman spectroscopy (CERS) was found to be a powerful low-cost high-resolution tool for analysis of non-reacting gaseous …
-
On entropic and compositional sound and its sources
… methane into a low Mach number mean flow of air. Spontaneous Raman spectroscopy (1.5 kHz) is employed for the time-resolved measurement of the local concentration upstream of the nozzle. Single pulse experiments in the infra-sound range are used to validate the derived analytical model for direct …
-
Single-cell analysis of hematopoietic cell fate on niche-mimetic platforms using Raman microspectroscopy
… combinations on stem cell fate specification. Raman spectroscopy has emerged as one of the few analytical approaches that can be used to noninvasively assay the biomolecular composition of cells. Combining Raman spectroscopy with multivariate methods such as partial least-squares discriminant …
-
Optimising nutrient use efficiency in crop production
… infrared (FTIR) spectroscopy and Raman spectroscopy are two such approaches and have been readily implemented across biological samples. However, their applications in the field of plant science have been relatively underexploited. This is largely associated with the presence of …
-
Velocity, temperature, and electric field measurements on a plasma-assisted hydrogen diffusion flame
… of the flame, by means of Rayleigh or Raman scattering techniques, in different regimes demonstrated a change in the fuel mixing structure and location of the reaction zone due to the position and intensity of the plasma-induced toroidal vortex. Finally, optical electric field …
-
Nebulizer facilitated molding of freeform 3D printed sacrificial scaffolds for breast tumor microenvironment tissue engineering
… with media. Using a combination of stimulated Raman scattering (SRS) microscopy and X-ray computed tomography, the coating was characterized to assess surface roughness and consistency. Colorimetric measurements of dissolution rates allowed optimization of sprayer parameters, yielding a …