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 23 for “"optical forces"”.
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Particle Manipulation Via Optical Forces and Engineering Soft-Matter Systems With Tunable Nonlinearities.
… of an electromagnetic field to exert mechanical forces on polarizable objects. This phenomenon is a direct consequence of the fact that light carries momentum, which in turn can be transferred to matter. Mediated by scattering, this interaction usually manifests itself as a “pushing force” in the …
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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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Implementation of Residual Tandem Neural Networks for Photonic Inverse Design
… the modeling and design of nanophotonic and optical structures. Traditional full-wave simulations are time and resource-intensive, which can act as a bottleneck in photonic design. On the other hand, deep-learning approaches for designing the response of nanophotonic geometries can be …
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Combining optical and hydrodynamic forces for single cell characterization, isolation and delivery
… interest from bulk samples, precise and directed forces on the order of picoNewtons are necessary. To generate these forces, we combine optical and hydrodynamic methods enabled by microfluidic platforms that operate in regimes where viscous forces dominate and hydrodynamics is readily predicted …
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Multi-view microscopy and multi-beam manipulation for high-resolution optical imaging
… in this thesis tackles some of the challenges in optical conventional and confocal microscopy and opens the third dimension for biological experiments like 3D cell cultures. Two instruments were built that provide high and isotropic resolution. In the Multi Imaging AxisMicroscope (MIAM) four …
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Photonic Crystals For Optofluidic Transport, Trapping And Biosensing
… interest to the optics community. Their unique optical properties have revolutionized the field of photonics and have enabled a new class of optical devices with applications in a broad range of areas such as creating nanophotonic light guiding circuits, efficient optical add-drop filters and …
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DNA nanotechnology for light-emitting plasmonic applications
… light into nanometric spaces, sustaining an optical resonance. This resonance can be carefully tuned by changing the geometry and material of the gap. In this work, I use the NanoParticle-on-Mirror (NPoM) geometry to fabricate plasmonic cavities in a bottom-up fashion by simply drop casting …
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Study of optical propulsion concepts and techniques for small-satellites
… and expel nanoparticle propellant via strong optical forces. This research also explores how material selection affects the electromagnetic response of the closely positioned asymmetric nanostructures.</p> <p>Furthermore, a dielectrophoretic (DEP) nanoparticle injector concept and its use in a …
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Nonlinear optical emission and near-field enhancement effects in arrays of gold bowtie nano-antennas
… we focus on laser-induced damage, nonlinear optical emission, and a proof-of-concept for utilizing arrays of gold BNAs to enhance the forces in an optical trapping system. From FDTD simulations, the optical response of a single BNA is demonstrated to increase the local intensity by a factor …
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Toward a demonstration of a Light Force Accelerometer
The Light Force Accelerometer (LFA) is an optical inertial sensor in which radiation pressure from two counter-propagating laser beams optically confines a glass microsphere. Inertial acceleration of the device results in microsphere displacement along the sensitive axis, which is subsequently …
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Engineering optical traps for new environments and applications in the measurement of biological adhesives and motors
Optical traps have played a central role in the exploration of biological systems through the examination of molecular motors, biopolymers, and many other interactions at the nano and micro length scales. This thesis seeks to extend the applications of optical trapping instrumentation and the …
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Propulsion of polymer particles on caesium ion-exchanged channel waveguides for stem cell sorting applications
Optical trapping of particles has become a powerful non-mechanical and nondestructive technique for precise particle positioning. The manipulation of particles in the evanescent field of a channel waveguide potentially allows for sorting and trapping of several particles and cells simultaneously. …
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Fresnel-focusing and bessel-beam integrated optical phased arrays for optical trapping applications
Optical trapping and tweezing - the manipulation of particles using optical forces - enables direct interaction with biological samples and non-invasive monitoring of their properties. As such, optical trapping has become a common tool in biology with applications ranging from better understanding …
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Nanophotonics for tailoring light-matter interaction/
… dielectric boundaries significantly enhances the optical response of nanoparticles. We propose an optimization-based theoretical approach to tailor the optical response of silver/silica multilayer nanospheres over the visible spectrum. We show that the structure that provides the largest …
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Novel optical trapping - from enhanced forces via vector beams to characterizing optical properties of trapped microparticles
… checksum: 82ec029b346982bddf02073e916eb734 (MD5) OpticalTrapping.tex: 17663 bytes, checksum: d845f91430736d6e098172e4cf2433fb (MD5) References.bib: 7592 bytes, checksum: 19f8daddf98c11859b904eb1a5207695 (MD5) Theory.tex: 30403 bytes, checksum: 5e92f6d396d5c0488ed582d5b38761c1 (MD5)
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The synergistic role of light and heat in liquid-based nanoparticle manipulation
… of nanoparticles and biomolecules. When optical effects dominate over thermal effects, the motion of nanoparticles can be controlled by optical forces. Here, we study the motion of 100 nm gold particles within a 1D optical potential, created by interfering counterpropagating beams. …
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The control of gold and latex particles on optical waveguides
The trapping of microparticles by optical methods using a focussed laser beam, known as optical tweezers, has evolved rapidly in the last thirty years. However this process is limited to the trapping of a small number of particles. Evanescent wave trapping allows simultaneous trapping of many …
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Optomechanical Devices and Sensors Based on Plasmonic Metamaterial Absorbers
… oscillations inside a subwavelength space at optical frequencies simultaneously overcome the limit of diffraction in conventional photonics and carrier mobilities in semiconductor electronics. Due to the subwavelength confinement, plasmonic resonances can strongly enhance local fields and, …
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On the theory of the optical stretcher : optics, mechanics, and thermal effects
The optical stretcher (OS) is dual-beam laser trap capable of capturing and deforming micron-sized particles or biological cells. It can be employed to measure cell-mechanical properties and, thus, to monitor physiological changes, such as differentiation, and to diagnose diseases that affect the …
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Generation and imaging of structural laser beams for optical trapping of airborne particles and light-matter interaction applications.
Recently emerged non-diffracting optical Bessel-Gaussian beams have extended the `optical toolbox' in laser interaction with matter studies, providing many techniques that are not possible using conventional Gaussian beams. The research work performed under this thesis focuses on the design, …
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