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 23 for “"light collection"”.
-
Optical cavity integrated surface ion trap for enhanced light collection
… entanglement generation relies upon efficient light collection from single ions into a single mode fiber. This can be realized by integrating an ion trap with an optical cavity and employing the Purcell effect for enhancing the light collection. Remote entanglement can be used as a resource for …
-
Design of the gas-puff imaging diagnostic for Wendelstein 7-X
… consists of a fast-camera component, a light-collection component, a "gas-puff" component with valves to inject controlled amounts of gas, and a component for valve control and data collection purposes. This thesis documents some of the aspects of the design of the diagnostic and its …
-
Laser diode-to-singlemode fiber butt-coupling and extremely-short-external-cavity laser diodes: Analysis, realization and applications
… application of the butt-coupling technique for light collection in an optical recording head is discussed. The work presented here is a research tool that can be used to facilitate the design of extremely-short external cavity laser diodes, which in many ways are technologically novel.
-
Measuring photometric and spectral radiometric bi-directional transmission and reflection in a video-goniospectrometer
… use of a unique semi-transparent hemispheroidal light collection system to investigate the spectral and angular selectivity of CFS across the visible and near infrared portions of the solar spectrum. This thesis seeks to describe the most recent advancements in the development of the …
-
Aging tests for dielectric-coated aluminum to be used in the Sudbury Neutrino Observatory
… and, thus, minimum statistical uncertainties, collection of Cerenkov light must be maximized. Our group at UBC, working with collaborators at Oxford, have designed and tested an optical concentrator that couples with a photomultiplier tube to achieve an effective gain in light collection by …
-
Neutrino interaction vertex reconstruction and particle identification in the MicroBooNE detector
… argon time-projection chamber (LArTPC) with a light-collection system, permitting precise tracking of neutrino interaction final states. MicroBooNE's primary physics goal is to resolve the low-energy electron neutrino appearance anomalies observed at MiniBooNE and LSND. The experiment therefore …
-
Sterile neutrino searches in MiniBooNE and MicroBooNE
… focusing on the MicroBooNE experiment and light collection studies. In particular, understanding the degradation source of TPB, designing the TPB-coated plates for MicroBooNE and developing light guide collection systems will be discussed. We find an excess of events in the …
-
Integration of Advanced Optics for Trapped Ion Quantum Information Processing
… to a probe beam that causes one state to scatter light (a "bright" state), but not the other state (a "dark" state). In free space, a single ion acts like a point source that emits in all directions; a standard two inch lens system can only collect about 2% of the light emitted by the ion. Poor …
-
Design, analysis, and fabrication of a prototype non-invasive system for assessment of biological and synthetic tissues
… This new system incorporates an efficient light delivery system, as well as a novel light collection system to provide high repeatability, reproducibility, sensitivity, and detection thresholds. The system incorporates simultaneous measurement of transmitted light, forward scattered light, …
-
Integrated optical components for quantum key distribution
… than conventional methods, while increasing light collection ratio. In the second part, site-controlled growth of semiconductor III-V nanowires on Si for photodetection applications is achieved by fabricating the sites using electron-beam lithography and wet etching. Studies were also carried …
-
Light-sheet microscopy used for tracking particles
… has generally been limited to 2D culture dishes. Light-sheet microscopy, a recent advance which was awarded Nature Method of the Year in 2014, allows fast, non-invasive 3D imaging across an entire organism. This works by decoupling illumination and detection such that the microscope only …
-
Fiber optic integration in planar ion traps
… because they collect a large fraction of light scattered by the trapped ions, and many optical fibers can be placed in a small area, allowing more ions to be measured in a small region. The question I address in this thesis is, "How can optical fibers be integrated onto planar ion traps?" …
-
Detection of Antineutrinos at the North Anna Nuclear Generating Station
… controllable artificial neutrino sources shed lights on a wide range of fundamental questions in physics. Specifically, the Reactor Antineutrino Anomaly hints that there may exist a novel eV-scale sterile neutrino, which requires new physics beyond the Standard Model. Performing reactor …
-
CRYOGENIC DETECTION OF SCINTILLATION LIGHT WITH LARGE AREA SIPM ARRAYS FOR NEXT GENERATION NEUTRINO AND DARK MATTER EXPERIMENTS
The collection of scintillation light is a fundamental technique for the detection of neutrino or dark matter interactions in cryogenic environments. The continuous development and deeper understanding of such technique are fundamental to advance the results in these fields. In the present work, a …
-
The application of laser measurement techniques to the pneumatic transport of fine particles
… for gas and liquid flows. In these situations, light from a low powered laser is scattered by seeding particles in the fluid which are small enough to follow the flow. The resulting Doppler shift of the scattered light is proportionate to the velocity of the particles and hence, to the velocity …
-
Fluorescence endoscopic imaging system for detection of colonic adenomas
… fluorescence imaging instrument. Excitation light at 3 51 and 364 nm was delivered through an optical fiber at a power of 300 mW. Fluorescence images over the spectral bandwidth from 400 to 700 nm were collected from colonic mucosa in 33 ms frames . . fluorescence images were collected in …
-
New approaches for optical and microoptical diagnostics in IC engines
… optical elements) has an about ten times better light collection efficiency than a commercial UV endoscope with simul-taneous high spatial resolution over a broadband spectral range. Its performance is demon-strated in various experiments. Microoptics for the generation of lightsheets and …
-
Controlling light-matter interaction with resonant semiconductor nanostructure
… electronic properties to obtain full control of light-matter interaction at the nanoscale. The outcomes may open the way for tunable, ultra-thin, cost-effective, and energy-saving optoelectronic devices. This research first studies the optical modes of dielectric nanostructures, including …
-
Growth and characterization of site-controlled InAs(Sb) nanowires for use in infrared photodetectors
… scientific understanding in the control of light matter interactions through geometry, while also offering practical integration advantages and strong, tuneable optical emission. However, optical emission is currently limited to low temperatures due to strong non-radiative Auger and surface …
-
Analysis of the optical coupling of wavelength-shifting fibers to organic liquid scintillator filled fluoropolymer tubes for industrial and nuclear security applications
… The 1:400 ratio of diameter to length makes light collection from the organic scintillator very challenging. Over ten configurations of OLS, fluoropolymer tubes, and WLS fibers were tested. The final configuration consisted of two 2mm BCF-91A WLS fibers optically coupled to the outside of an …
Page 1 of 2