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 17 of 17 for “"optical manipulation"”.
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Precise optical manipulation techniques for exploring neuronal function
This thesis presents two optical techniques for manipulating neurons in the analysis of their function, namely time-gated holographic two-photon photostimulation and femtosecond laser dendrotomy. At the start of this thesis, no illumination technique had been able to activate synapses along the …
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Precise optical manipulation techniques for exploring neuronal function
This thesis presents two optical techniques for manipulating neurons in the analysis of their function, namely time-gated holographic two-photon photostimulation and femtosecond laser dendrotomy. At the start of this thesis, no illumination technique had been able to activate synapses along the …
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Photonic Tweezers for Optical Manipulation of Cells and Tissues
Optical tweezers represent a powerful tool for studying forces in biological samples. In this thesis, I explored applications of optical tweezers that pushed the technique beyond its limitations. In fact I worked on extending the range of forces applicable by the tweezers and on applying optical …
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Novel schemes for the optical manipulation of atoms and molecules
… We hope to implement these and other coherent manipulation schemes, and we begin with a system which is well understood and over which we can exert precise control. This thesis covers the design and construction of an experiment to demonstrate coherent manipulation of cold rubidium atoms …
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Optical manipulation of helium(2(3)S) atoms with a diode laser
… atomic beam of He(2$\sp3$S) metastable atoms by optical pumping on the $\rm 2\sp3S\sb1\rightarrow2\sp3P\sb1$ (D1) transition. The diode laser is an InGaAs/GaAs strained multiquantum well with a distributed Bragg reflector to insure single longitudinal mode operation. The laser has been frequency …
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Applications of Optical Manipulation for Low Cost Implementation, Beam Shaping and Biophysical Force Measurements
… of research fields requiring non-contact micro- manipulation. An increasing number of these fields are turning to optical tweezers as a solution, owing to their high spatial and temporal resolution. Optical tweezers have the ability to quantitively exert and measure forces on the piconewton …
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Three dimensional optofluidic devices for manipulation of particles and cells
Optical forces offer a powerful tool for manipulating single cells noninvasively. Integration of optical functions within microfluidic devices provides a new freedom for manipulating and studying biological samples at the micro scale. In the pursuit to realise such microfluidic devices with …
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Optical micro- and nanofibres: Higher mode generation and particle manipulation studies
… thesis is centred on two experimental fields of optical micro- and nanofibre research; higher mode generation/excitation and evanescent field optical manipulation. Standard, commercial, single-mode silica fibre is used throughout most of the experiments; this generally produces high-quality, …
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Nonlinear Periodic Structures: From Classical to Quantum Devices
… transfer-matrix (TDTM), is presented to simulate optical pulse propagation in layered media with resonant nonlinearity. As there were no satisfactory methods in the literature to model this problem, in order to validate and compare with the TDTM method, the standard FDTD method is generalized to …
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Exploiting the Spin Of Photons and Electrons in Light-Matter Interactions
… in a waveguide is revealed through the use of optical torque to ex- cite torsional motion of the device. The quantitative optical torque measurement confirms the spin angular momentum of a photon in waveguide to be on the order of . Our measurement also provides a check of the famous …
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Nonlinear Optical Techniques For Imaging And Manipulating The Mouse Central Nervous System
… of novel multi-photon microscopy (MPM) and optical manipulation techniques as they apply to studies the mouse central nervous system (CNS), with an emphasis on the spinal cord. The scientific findings which have resulted from the implementation of these techniques are also presented. In …
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Investigation of quantum information storage in rare earth doped materials
… quantum memory. Long coherence times in both the optical and hyperfine levels have been observed as well as optical manipulation of the nuclear spin states. The rare earth ions of interest also possess a linear Stark shift which is essential for the quantum memory under investigation here. The …
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Investigation of quantum information storage in rare earth doped materials
… quantum memory. Long coherence times in both the optical and hyperfine levels have been observed as well as optical manipulation of the nuclear spin states. The rare earth ions of interest also possess a linear Stark shift which is essential for the quantum memory under investigation here. The …
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Plasmonic nanoantennas for multipurpose particle manipulation and enhanced optical magnetism
Optical manipulation – using light to control matter – is based on the transfer of momentum from confined electromagnetic fields to micro- and nanoscale objects. Optical tweezers, based on the use of high-numerical aperture objective lenses, take advantage of this phenomenon to form non-contact …
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Accelerated fibre microendoscopy techniques for in-vivo applications
… which allows converting a hair-thin multimode optical fibre into an ultra-narrow imaging tool. Compared to current endoscopes based on GRIN lenses or fibre bundles, this concept offers a footprint reduction exceeding an order of magnitude, together with a significant enhancement in …
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Photon Sources for Linear Optical Quantum Computing
… measurement and quantum computing. Linear optical quantum computing (LOQC) is a technology of particular interest - especially given that recent progress in on-chip waveguide technology removes the requirement for complex and costly bulk optics setups and state-of-the-art detectors have …