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 33 for “"single photon counting"”.
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Long-range depth profiling based on time-correlated single-photon counting
Single-photon detection technologies are of high relevance to light detection and ranging (LiDAR) applications for the range resolution and surface profiling of distant target objects. Modern single-photon detectors offer high quantum efficiencies and small timing jitters in the order of tens of …
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Lumineszenz durch hochenergetische Atom- und Clusterionen: Untersuchung an dünnen Schichten
… wurde untersucht und dabei das Messprinzip des 'single ion hitting single photon counting' eingesetzt. Durch Verwendung von Proben mit Schichtdicken von 50 Nanometern bis ca. 3 Mikrometern war die direkte Bestimmung der Lumineszenz pro Wegstrecke möglich. Die Diskussion der gewonnenen Messdaten …
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Superconducting nanowire single-photon detectors on aluminum nitride photonic integrated circuits
With recent advances in integrated single-photon sources and quantum memories, onchip integration of high-performance single-photon detectors becomes increasingly important. The superconducting nanowire single-photon detector (SNSPD) is the leading single-photon counting technology for quantum …
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LINEAR AND NONLINEAR FLUORESCENCE LIFETIME IMAGING FOR BIOSENSING APPLICATIONS
… FLIM technique combined with Time Correlated Single Photon Counting (TCPSC) Technology was used to develop several novel biosensing approaches. Using linear or nonlinear excitation source, TCSPC-FLIM enabled real time monitoring of cellular metabolite profiles, as well as longitudinal …
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Microwave engineering in superconducting nanowires for single-photon detection
Detecting light at the single-photon level plays a crucial role in photonic quantum information processing, deep-space optical communication, astronomical observation, and biological and chemical sensing. With their exceptional performance, superconducting nanowire single-photon detectors (SNSPDs) …
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The Recovery Of Underlying Lifetime Distributions From Fluorescence Decay Data
… underlying lifetime distributions from single photon counting fluorescence decay data are described, namely the Exponential Series Method (ESM) and the Maximum Entropy Method (MEM). Extensive testing of these two methods is performed, using both real and simulated decay curves, in order …
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Spectrum and conversion efficiency measurements of suprathermal electrons from relativistic laser plasma interactions
… up to 500 keV. The spectrometer is used with a single photon counting camera for measuring K[alpha] emission in experiments on the Titan laser (1.06 [mu]m, 150 J, 0.7 ps) at Lawrence Livermore National Laboratories. The Bremsstrahlung and K-shell emission from 1 mm3 planar targets irradiated …
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Strategies towards high performance (high-resolution/linearity) time-to-digital converters on field-programmable gate arrays
Time-correlated single-photon counting (TCSPC) technology has become popular in scientific research and industrial applications, such as high-energy physics, bio-sensing, non-invasion health monitoring, and 3D imaging. Because of the increasing demand for high-precision time measurements, …
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Protein and RNA folding: from bulk towards high throughput single molecule experiments
… of a high throughput time correlated single photon counting experiment is presented. Drops of ~10 μm diameter are optically trapped and interrogated by a femtosecond probe laser beam. Fluorescence photons emitted by the sample inside the drop are collected in all 4π steradians with …
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Novel Thienyl Dyes and related Metal Carbonyl Complexes
… infrared (TRIR) spectroscopy and time correlated single photon counting. Chapter two involves the study of thienyl porphyrins. This chapter begins with a literature survey on the synthesis, photophysics and electrochemistry of thienyl porphyrin systems. The synthesis of the porphyrins studied is …
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Optical methods for monitoring biological parameters of phototropic microorganisms during cultivation
… investigation of microalgae cells. Specifically, photondensity wave spectroscopy was applied as a technique for the on-line observation of the culture. For effective evaluation of the photosynthetic growth processes, fast and non-invasive sensor systems that analyze the relevant biological and …
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Time Resolved Light Sheet Microscopy
… of prevention and treatment. Time-correlated single photon counting fluorescence lifetime imaging microscopy is just one of the tools used to carry out this line of research. Here we demonstrate a direct interaction between two proteins involved in gene regulation and expression; p21 and FMN2. …
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The synergistic role of light and heat in liquid-based nanoparticle manipulation
… profiles were characterised by time-correlated single-photon counting microscopy, with a temperature-sensitive dye. Through analysis of the particle velocities, the thermoelectric field strength, as well as the previously unknown Soret coefficients of azide ions were quantified. Transmission of …
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Development of a simulation environment for the analysis and the optimal design of fluorescence detectors based on single photon avalanche diodes
… of the fluorescence detectors. The features of single-photon avalanche diodes (SPAD) make these optical detectors a good alternative to conventional photomultiplier tubes and micro-channel plates. CMOS technology allows cointegration of a SPAD and electronic circuits on the same substrate and …
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Capillary and microchip gel electrophoresis using multiplexed fluorescence detection with both time-resolved and spectral-discrimination capabilities: applications in DNA sequencing using near-infrared fluorescence
… the information content obtainable from a single assay and system miniaturization has continued to be important research areas in analytical chemistry. The research presented in this dissertation involves the development of a two-color, time-resolved fluorescence microscope for the …
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Luminescent decay and spectra of impurity-activated alkali halides under high pressure
… the electronic transitions, a pressure-dependent single configuration coordinate model is used to interpret the luminescence data. While pressure affects the volume, it also couples to the nontota1ly symmetric coordinates that determine the lifetime in the phosphors studied here. Luminescent …
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RO-Based TDC Design with Configurable Resolution and Power for SPAD-Based TCSPC LiDAR Applications
Single-photon avalanche diodes (SPAD) are used to measure time-of-flight (ToF) using CMOS time-to-digital Converters (TDCs) for compact, low-cost, and highly integrated three-dimensional (3D) sensing. The TDC specifications are critical determinants of the system's range, resolution, and accuracy. …
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New approaches for optical and microoptical diagnostics in IC engines
… were measured via TCSPC (time-correlated single-photon counting) with unprecedented time resolution. The measured bi-exponential decay for toluene LIF could validate the prevailing model. Before the microoptical systems were finished, two experiments in optical single-cylinder engines were …
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High-speed electrochemistry using ultramicroelectrodes
… as a function of time using time correlated single photon counting (TCSPC). Computer processing of the light intensity data can convert this data back to current. The technique is capable of measurements on nanosecond time scales, but TCSPC requires tens or hundreds of millions of experiments …
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A photon counting pixel detector for x-ray imaging
… 3 presents measurements made by the author on a photon counting detector (PCD1) comprising a PCC1 (MEDIPIX1) readout chip bumpbonded to silicon and gallium arsenide pixel detectors. Tests on the seperate readout chip and the bump-bonded assembly are shown with comparisons between the performance …
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