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Dissertations / Theses on the topic 'Photon annihilation'

Author: Grafiati

Published: 10 March 2023

Last updated: 11 March 2023

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1

Deng, Fan. "Photon Upconversion Based on Triplet-Triplet Annihilation." Bowling Green State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1395249331.

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2

Wilke, Bryn. "UPCONVERTING LOW POWER PHOTONS THROUGH TRIPLET-TRIPLET ANNIHILATION." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1335378364.

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3

Berkowicz, Sharon, Helena Olsson, and Henrik Broberg. "Evaluation of Amyloid Fibrils as Templates for Photon Upconversion by Sensitized Triplet-Triplet Annihilation." Thesis, KTH, Skolan för kemivetenskap (CHE), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215658.

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In the face of global warming and shrinking resources of fossil fuels the interest in solar energy has increased in recent years. However, the low energy and cost efficiency of current solar cells has up to this date hindered solar energy from playing a major role on the energy market. Photon upconversion is the process in which light of low energy is converted to high energy photons. Lately, this phenomenon has attracted renewed interest and ongoing research in this field mainly focuses on solar energy applications, solar cells in particular. The aim of this study was to investigate and evalu

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4

Aldousari, Hanan. "Study of 2-to-3 photon annihilation using hydrophilic material as hypoxic tumour phantom." Thesis, University of Surrey, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.616952.

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The use of three gamma annihilation as a new PET molecular imaging modality which can predict tumour hypoxia was proposed by Kacperski and Spyrou in 2004. The positronium and its annihilation, could then serve as an oxygen-sensitive marker. The relative magnitude of three photon annihilation is increased in an oxygen deficient environment. The main questions addressed in this thesis are the potential use of the lanthanum bromide LaBr3: Ce (5%) scintillator detector for three-photon positron annihilation measurements. Also, the optimum source-to-detector distance that achieves good efficiency a

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5

RONCHI, ALESSANDRA. "Hybrid and Nanostructured materials for low power photon upconversion based on triplet-triplet annihilation." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/370864.

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Durante il dottorato ho investigato il processo fotofisico di "upconversion" assistito da annichilazione tripletto-tripletto (TTA-UC) tramite studi di spettroscopia in sistemi profondamente differenti gli uni dagli altri. In TTA-UC radiazione ad alta energia è emessa dalla ricombinazione radiativa dello stato di singoletto eccitato di una molecola emettitore, popolato precedentemente dall'annichilazione dei tripletti di due emettitori. Un sensibilizzatore immagazzina la luce incidente a bassa energia e trasferisce l'eccitazione agli emettitori tramite trasferimento di energia alla Dexter. Poic

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6

Kang, Ji-Hwan. "Energy transfer enhancement of photon upconversion systems for solar energy harvesting." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/45846.

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Photon energy upconversion (UC), a process that can convert two or more photons with low energy to a single photon of higher energy, has the potential for overcoming the thermodynamic efficiency limits of sunlight-powered devices and processes. An attractive route to lowering the incident power density for UC lies in harnessing energy transfer through triplet-triplet annihilation (TTA). To maximize energy migration in multicomponent TTA-assisted UC systems, triplet exciton diffusivity of the chromophores within an inert medium is of paramount importance, especially in a solid-state matrix for

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7

Alkhorayef, Mohammed A. "The potential use of three photon positron annihilation in positron emission tomography for tumour hypoxia imaging." Thesis, University of Surrey, 2010. http://epubs.surrey.ac.uk/843299/.

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Identifying and localising tumor hypoxia in cancer patients is a challenge in oncology imaging. There are many ongoing clinical trials using conventional positron emission tomography (PET) scans and PET agents as cellular markers for detection of tumour hypoxia depending on the concept of the basic physics of 2gamma annihilation. However, Kacperski and Spyrou (2004) proposed, for the first time, to use 3gamma annihilation as a new PET molecular imaging modality, where the positronium and its annihilation, could serve as an oxygen-sensitive marker. The effective yield of 3gamma annihilation dep

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8

Llewellyn, T. J. "Evaluation of a multi-element ismuth germanate converter for high resolution and efficiency annihilation photon detection." Thesis, University of Bristol, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377349.

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9

Abuelhia, Elfatih Ibrahim. "The potential use of three photon positron annihilation processes as a new imaging modality for positron emission tomography (PET)." Thesis, University of Surrey, 2006. http://epubs.surrey.ac.uk/843017/.

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In this thesis the main aspects of three photon positron annihilation processes and their potential use in medical imaging have been investigated as a positron emission tomography technique. The main objectives are focused on: three-photon positron annihilation measurement and imaging, analytical modelling and Monte Carlo simulation and the evaluation of the detection system requirements. A novel method as proof-of-principle of the three photon positron annihilation imaging concept based on a triple coincidence imaging technique using high energy resolution semiconductor detectors has been int

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10

Lissau, Jonas Sandby. "Non-Coherent Photon Upconversion on Dye-Sensitized Nanostructured ZrO2 Films for Efficient Solar Light Harvesting." Doctoral thesis, Uppsala universitet, Fysikalisk kemi, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-229831.

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Photon upconversion by sensitized triplet–triplet annihilation (UC-STTA) is a photophysical process that facilitates the conversion of two low-energy photons into a single high-energy photon. A low-energy photon is absorbed by a sensitizer molecule that produces a triplet excited state which is transferred to an emitter molecule. When two emitter triplet states encounter each other, TTA can take place to produce a singlet excited state which decays by emission of a high-energy (upconverted) photon. While traditional single-threshold dye-sensitized solar cells (DSSCs) have a maximum efficiency

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11

Hasner, Caspar [Verfasser], Martin [Akademischer Betreuer] Beneke, Martin [Gutachter] Beneke, and Björn [Gutachter] Garbrecht. "Resummed photon spectra from wino and Higgsino dark matter annihilation at NLL' accuracy / Caspar Hasner ; Gutachter: Martin Beneke, Björn Garbrecht ; Betreuer: Martin Beneke." München : Universitätsbibliothek der TU München, 2020. http://d-nb.info/1215837917/34.

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12

Sanchez, Crespo Alejandro. "Novel computational methods for image analysis and quantification using position sensitive radiation detectors." Doctoral thesis, Stockholm University, Medical Radiation Physics (together with KI), 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-754.

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<p>The major advantage of position sensitive radiation detector systems lies in their ability to non invasively map the regional distribution of the emitted radiation in real-time. Three of such detector systems were studied in this thesis, gamma-cameras, positron cameras and CMOS image sensors. A number of physical factors associated to these detectors degrade the qualitative and quantitative properties of the obtained images. These blurring factors could be divided into two groups. The first group consists of the general degrading factors inherent to the physical interaction processes of rad

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13

Sterner, Kevin L. "Electron-positron annihilation into photons at √s = 50 to 64 GeV." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40450.

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14

Butterling, Maik [Verfasser], Reinhard [Akademischer Betreuer] Krause-Rehberg, Hartmut [Akademischer Betreuer] Leipner, and Klaus [Akademischer Betreuer] Rätzke. "Application of high-energy photons for positron annihilation spectroscopy and positronium chemistry / Maik Butterling. Betreuer: Reinhard Krause-Rehberg ; Hartmut Leipner ; Klaus Rätzke." Halle, Saale : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2014. http://d-nb.info/1054950660/34.

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15

Lott, Joseph Robert. "Design, Synthesis and Incorporation of Functional Additives into Multilayered Polymer Films." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1295673932.

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16

Nguyen, Dac Trung. "Spectroscopie optique nonlinéaire à 1,55 μm de boîtes quantiques et de nanotubes de carbone". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2011. http://tel.archives-ouvertes.fr/tel-00628240.

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La technique originale de spectroscopie par saturation d'absorption, dite holeburning spectral, est mise en oeuvre pour étudier l'élargissement homogène de transitions optiques à 1,55 μm dans deux types de nanostructures. Pour les boîtes quantiques GaN/AlN, notre expérience constitue la première mesure directe de la largeur homogène de la transition intrabande s − pz. Des études en puissance démontrent le rôle prédominant des processus Auger dans la relaxation de population des niveaux. Le profil spectral d'absorption homogène s'avère gaussien. La forte augmentation de la largeur homogène entr

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17

Hu, Huayu [Verfasser]. "Multi-photon creation and single-photon annihilation of electron-positron pairs / presented by Huayu Hu." 2011. http://d-nb.info/1011936178/34.

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18

COSTANZO, LUCA SALVATORE. "Hybrid quantum state and mode engineering of light." Doctoral thesis, 2017. http://hdl.handle.net/2158/1086807.

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In this thesis work, after a brief introduction of some basic concepts of quantum optics, some experimental techniques useful for the manipulation of quantum states of light are presented. In particular, I focused on two transformations operated at the single-photon level, like the addition and the subtraction of a single photon from a travelling light beam. Both these methods share a probabilistic approach, that is their implementation has a non unitary success probability. Anyway, the detection of an additional photon in an ancillary mode exactly announces when the operation has been actuall

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19

"Photophysical Studies of Photon Upconversion via Triplet-Triplet Annihilation in Polymer Systems with Potential Photovoltaic Applications." Thesis, 2014. http://hdl.handle.net/10388/ETD-2014-04-1509.

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The present work reports the study of noncoherent photon upconversion (NCPU) via triplet-triplet annihilation (TTA) in polymer systems. This upconversion mechanism has application in photovoltaic devices through the utilization of sub-band gap photons for potentially enhanced power conversion efficiencies. First, homomolecular TTA was studied in zinc tetraphenylporphyrin (ZnTPP) in polymer matrices. Here, ZnTPP acts as both the sensitizer and upconverting emitter as TTA yields an S2 excited porphyrin. Use of poly(methyl methacrylate) (PMMA) as the host polymer demonstrates aggregation-driv

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20

"Characterization of the optical properties of metalloporphyrins in TiO2 sol-gel films for photon upconversion applications." Thesis, 2013. http://hdl.handle.net/10388/ETD-2013-10-1028.

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The photophysical properties of a series of Zn (II) porphyrins adsorbed onto a semiconductor were investigated using steady-state absorbance and emission measurements. The ability of the porphyrins to undergo triplet-triplet annihilation (TTA), a photophysical process through which photons in the red and near-infrared (NIR) regions of the optical spectrum can be converted into higher energy photons (upconversion), was explored. Aggregation capabilities were determined to verify possibility of these molecules to undergo triplet-triplet annihilation (TTA). TTA has significant potential for incre

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