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 85 for “"Optical Trap"”.
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Measuring acoustic fields in an optical trap
This thesis describes progress in the use of optical traps for measurement of acoustic fields, a first step toward acoustic micromanipulation in fluids. The optical trap used throughout this study is carefully characterized. Eccentricity of measured distributions of thermal fluctuations of trapped …
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Design of a dual beam optical trap
Dual beam optical traps use radiation pressure from two counterpropagating laser beams to manipulate microscopic particles. Typical traps use optical fibers to guide those beams. This thesis proposes a design for the coaxial alignment of optical fibers that allows for the fibers to translate along …
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Laser cooling of rubidium atoms in a magneto-optical trap
… to rubidium atoms confined in a magneto-optical trap. After a short history of the field of laser cooling, a review of the semiclassical theory of mechanical interactions between two-level atoms and electromagnetic radiation is given. Different formulations of the semiclassical theory are …
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A chirped, pulsed laser system and magneto-optical trap for rubidium
… construction and characterisation of a magneto-optical trap (MOT) for 85Rb from the very beginning. It details both the optical and mechanical aspects from laser diode assembly, tuning and stabilisation to the preparation and assembly of the vacuum system. The MOT construction forms the first …
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Experimental Investigation of a Rubidium-Argon Dual Species Magneto-Optical Trap
… sides of the periodic table in a dual magneto optical trap (DMOT) has been accomplished. The alkali-metal <sup>85</sup>Rb and the noble gas <sup>40</sup>Ar* have been simultaneously confined, characterized, and interspecies interaction parameters have been measured. The DMOT confined 1.2 × …
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Characterization of Magneto-optical Trap For Experiments in Light-Atom Interfacing
… cloud density and temperature in a magneto-optical trap (MOT). The purpose is to find the method in obtaining the densest and coldest cloud the setup can produce. In steady state trap, the highest atomic density possible is that of a cloud in multiple scattering regime where a repulsive …
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Photoassociative Spectroscopy of Ultracold Argon and Krypton Confined in a Magneto Optical Trap
… cool and confine the atoms and is known as the “trapping transition.” Spectroscopy near the trapping transition in argon was studied previously in our group [1] and specific features were observed in the spectrum. At the time, the features were not definitively identified, but more than one …
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Experimental studies of evaporative cooling and Bose Einstein condensation in an optical trap
… loading phase of 60 ms about 1% of the atoms are trapped in a tight CO2 Laser focus region. Evaporative Cooling is optimized by lowering the dipole trap depth over a 7s period, leading to condensates of typically having 20000 atoms. In this thesis detailed characterization of the system and its …
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Adaptive Control of an Optical Trap for Single Molecule and Motor Protein Research
… the development of an advanced, state-of-the-art optical trap for use in biological materials and nanosystems investigation. An optical trap is an instrument capable of manipulating microscopic particles using the inherent momentum of light. First introduced by Askin et al., the single beam …
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Development of a plasmon resonance enhanced optical trap for characterisation of single metal nanoparticle
… a plasmon resonance based gold nanorod trapping platform and suggest methods for characterizing a trapped single nanoparticle. While there are published methods that emphasize on building up an optical trapping setup or trap single gold nanorod using high power lasers, none were found …
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Characterization of a two-color magneto-optical trap for a spin-squeezed optical lattice clock
We experimentally realize a magneto-optical trap (MOT) for ytterbium that simultaneously scatters light from two atomic transitions, in order to reduce the minimum magnetic field gradient required for trapping atoms. From the experimental data, we propose a model of the MOT where one transition is …
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Noise analysis of inkjet printers over stages and quality of the job and frequency sources from equipment in laboratory optical trap room
… contributors to a laboratory room containing an optical trap. The laser's fan-based cooling system yields frequencies of approximately 270 Hz and 540 Hz in the room, while the room's heater produces frequencies of approximately 110 Hz. The devices contributing to frequency peaks are the laser's …
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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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Towards a quantum gas microscope for fermionic atoms
… of a laser system capable of cooling and trapping gaseous lithium-6 atoms in a 3D Magneto-Optical Trap. Second, we discuss the realization of a 2D Magneto-Optical Trap which, in our experiment, acts as a high-flux source of cold potassium-40 atoms. These two systems are critical first …
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Surface trap for ytterbium ions
… an experiment to load a shallow planar ion trap from a cold atom source of Ytterbium using photoionization. The surface trap consisted of a three-rod radio frequency Paul trap fabricated using standard printed circuit board techniques. The cold atom source was an isotope-selective …
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Methods of single-molecule energy landscape reconstruction with optical traps
Optical traps facilitate measurement of force and position as single molecules of DNA, RNA, or protein are unfolded and refolded. The effective energy landscape of a biomolecule can be reconstructed from the force and position data, providing insight into its structure and regulatory functions. We …
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Loading a planar RF Paul Trap from a cold Yb⁺ source
… planar radio frequency, three-rod Paul Trap, loaded with Yb+ ions that have been photoionized from a source of neutral atoms, which were cooled in a magneto-optical trap. Planar ion traps have only recently been successfully loaded[1], and never from a cold ion source. Additionally, …
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Trapping cold rubidium in a fiber
… of loading cold ⁸⁷Rb into a red-detuned optical dipole trap within a hollow core photonic fiber. This confines the atoms to 6 microns in two dimensions. We initially cooled the Rubidium in a magneto-optical trap. The great confinement of the Rubidium allows for increased optical depths …
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Modeling and Experimental Techniques to Demonstrate Nanomanipulation With Optical Tweezers
… of effective prototyping tools at the nanoscale. Optical trapping is well established for flexible three-dimensional manipulation of components at the microscale. However, it has so far not been demonstrated to confine nanoparticles, for long enough time to be useful in nanoassembly applications. …
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Exploring the mechanome with optical tweezers and single molecule fluorescence
The combination of optical tweezers and single molecule fluorescence into an instrument capable of making combined, coincident measurements adds an observable dimension that allows for the examination of the localized effects of applied forces on biological systems. This technological advance had …
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