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 53 for “"Photodetection"”.
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Photodetection using ultrathin metal films
… is the most widely used material for visible photodetection, with extensive applications in both consumer and industrial products. Further, its excellent optoelectronic properties and natural abundance have made it nearly ideal for microelectronic devices and solar cells. However, silicon's …
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Photodetection in Silicon Pyramidal Microdischarges
Photodetection in a silicon pyramidal microdischarge device has been observed. This hybrid plasma/semiconductor device was fabricated from standard silicon wafers using common integrated circuit, microfabrication techniques. The response of the devices to a 780-nm laser diode was shown to have an …
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Photodetection and Spectrometry at the Nanoscale
Over the past fifteen years, one- and two-dimensional nanostructures have drawn intense attention across a range of scientific fields. For optoelectronic device applications these nanomaterials are particularly attractive due to their fundamental physical properties, such as dramatic environmental …
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Simulation of a pion photodetection experiment
In this thesis we asses the capabilities of the Crystal Box detector and evaluate its advantages over the Neutral Meson Spectrometer (NMS) detector in a planned experiment at the High Intensity Gamma Source (HI[gamma]S) at Duke University. After discussing the relevance of the experiment and …
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High efficiency photodetection below the quantum noise limit
Two low-noise, high quantum efficiency, high bandwidth photodetectors have constructed to form a balanced homodyne detector to detect squeezed light. The detectors have quantum efficiencies of 85% and 90%, a bandwidth of 1MHz, and a dark noise of ... at 1MHz.
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Technologies for Room-Temperature Mid-Infrared Photodetection using Graphene
… These devices achieve waveguide-integrated photodetection at a record-long wavelength of 5.2 µm with a Johnson noise-limited noise-equivalent power of 1.1 nW/Hz¹⸍² . They also feature fast response, with no fall-off in photoresponse up to 𝑓 = 1 MHz and a predicted 3-dB bandwidth of 𝑓₃ …
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Graphene Field-Effect Transistors on p-doped Semiconductors for Photodetection
Recent advancements in photodetection using 2D materials suggest significant improvements in the performance of photodetectors. Among these, graphene field-effect transistors (GFETs) have demonstrated promising enhancements in photodetection, characterized by low noise, broad-spectrum response, …
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The measurement, creation and manipulation of quantum optical states via photodetection
In this thesis, we demonstrate an array of photodetection theory and techniques bridging the traditional discrete and continuous variable experimental domains. In quantum optics, the creation and measurement of states of light are intertwined and we present experimental architectures considering …
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Investigation of Thin Film Supercurrent and Photodetection in Wide Niobium Nitride Wires
Over the past two decades, superconducting nanowire single photon detectors have become the dominant platform for detection at telecommunication wavelengths. Despite their practical success, the theoretical framework that describes the detection mechanism within the nanowire is continually …
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Narrowband Photodetection in the Short-wavelength Infrared with a Plasmon-induced Hot Electron Device
In gratings, incident light can couple strongly to plasmons propagating through periodically spaced slits in a metal film, resulting in a strong, resonant absorption whose frequency is determined by the nanostructure periodicity. When a grating is patterned on a silicon substrate, the absorption …
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Strain-balanced silicon-germanium materials for near IR photodetection in silicon-based optical interconnects
… way to achieve high quantum efficiency near IR photodetection for silicon-based optical interconnects. The growth of the strain-balanced superlattices by molecular beam epitaxy (MBE) and ultra high vacuum chemical vapor deposition (UHV-CVD) is presented and the role of adsorbed hydrogen during …
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Timing performance of superconducting nanowire single-photon detectors
… has largely remained unchanged. Furthermore, the photodetection process in superconducting nanowires is still not fully understood and subject to ongoing research. In this thesis, I will present a systematic study of the timing performance of different types of nanowire single-photon detectors. I …
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Polarization entanglement storage in ensemble-based atomic memories
… generation, as well as finite transmission and photodetection efficiencies under number-resolving and non-resolving photodetection schemes. Using these results, we perform a detailed quantitative performance analysis of quantum networks that distribute and swap entanglement.
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Développement d'un dispositif intégré de photodétection de grande sensibilité avec discrimination spectrale pour les laboratoires sur puce
… fluorescence measurements with the designed photodetection device were performed on mixtures of fluorescent nanocrystals (quantum dots) or of organic fluorophores. These preliminary results validate the performances in terms of photodetection of the designed integrated photodetection device.
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Studies on Optically Induced DC-Voltage in Thin Film Structures
… applications ranging from energy conversion to photodetection. However, there are still many challenges to reach high conversion efficiency and broad spectral coverage. Overall, photodetection through conventional procedures is based on light absorption by a material with a matching bandgap. …
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Nanostructures for Coherent Light Sources and Photodetectors
… efficient light emission as well as broadband photodetection from silicon in extending the silicon technology into fully integrated optoelectronic circuits. Recent breakthroughs, including the demonstration of high-speed optical modulators, photodetectors, and waveguides in silicon, have …
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Silicon microplasma devices as real-time sensors of bulk plasma
… devices have been demonstrated to exhibit photodetection capabilities. This thesis explores the possibility of using silicon microcavity devices as passive photodetectors for bulk plasma to serve as a diagnostic tool. The voltage-current characteristics of the device show that there is an …
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Heterogeneous integration of two-dimensional materials for on-chip optical interconnects
… dramatically enhanced and spectrally selective photodetection in graphene. To further enable broadband photodetection, a similar scheme that couples graphene to the evanescent field of nanophotonic waveguides extends the interaction length of graphene with light dramatically, achieving …
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Engineering Nanocrystal Devices Through Cation Exchange And Surface Modifications
… design to achieve shortwave infrared (SWIR) photodetection. We build photo FETs with CdSe NCs by surface modification to introduce In doping. We achieve strong quantum confinement in high mobility CdSe NC thin films, which we hypothesize makes intra sub-band transitions possible and allows us …
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Optical detection development for the Hogan quantum holographic noise experiment
… interferometers. We have assembled and tested a photodetection system to measure broadband phase correlation between two optical signals, to be used in the noise detection experiment. This included modifying and characterizing photodetectors and setting up a system to record the signal …
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