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Dissertations / Theses on the topic 'Visible-light'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Hussein, Ahmed Taha. "Visible light communication system." Thesis, University of Leeds, 2016. http://etheses.whiterose.ac.uk/15894/.

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Visible light communication (VLC) systems have become promising candidates to complement conventional radio frequency (RF) systems due to the increasingly saturated RF band and the potentially high data rates that can be achieved by VLC systems. Over the last decade, significant research effort has been directed towards the development of VLC systems due to their numerous advantages over RF systems, such as the availability of simple transmitters (light emitting diodes, LEDs) and receivers (silicon photo detectors), better security at the physical layer, improved energy efficiency due to the d

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Soleiman, Andreas. "Battery-free Visible Light Sensing." Thesis, Uppsala universitet, Avdelningen för datorteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-381370.

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In this thesis, we show that it is possible to design a battery-free light sensing system that can sense and communicate hand gestures while operating fully on harvested power from indoor light. We present two main innovations that push our system to tens of microwatts of power to enable battery-free operation. First, we introduce a novel visible light sensing system that can track variations in light intensity by using a solar cell as a sensor. Solar cells are unlike photodiodes optimized for energy yield in the visible light region and hence do not require any power hungry active components

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Raval, Manan. "Nanophotonic visible light phased arrays." Thesis, Massachusetts Institute of Technology, 2016. http://hdl.handle.net/1721.1/109686.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2016.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 81-85).<br>Previously demonstrated integrated optical phased arrays have primarily been implemented in silicon-based platforms and have therefore been limited to operation at infrared wavelengths, where silicon provides low-loss transmission. Developing integrated optical phased arrays for visible wavelengths would enable the exploration of new applications for this technology, such as autost

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4

Ferreira, Ricardo Xavier da Graça. "Gallium nitride light-emitting diode enabled visible light communications." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=28805.

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This thesis focuses on the development, measurement and application of novel micrometre-sized light emitting diodes (micro-LEDs) based on Gallium Nitride (GaN) for visible light communications (VLC) in both free-space and guided wave configurations. The goal is to set benchmarks for LED-based wireless optical communications. An overview of the field integrating research, industry and standards is presented. A top-down approach is taken with application requirements driving development of new micro-LEDs with simultaneously increased optical power and modulation bandwidth. This was achieved by m

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Guo, Shangyuan. "Device Pairing Using Visible Light Communications." Thesis, Mittuniversitetet, Avdelningen för informations- och kommunikationssystem, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-21601.

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Device authentication in ad hoc networks is becoming more and more important. Nowadays, there are many interesting applications which communicate via the short-rang wireless communication channel (such as Bluetooth or WiFi). In the communication, a great deal of sensitive information is required to be transmitted. Therefore, device authentication is significant. In order to build a secure authentication mechanism, protocols are proposed using human control visual channels. However, this method brings many challenges, the main one being the burden placed on humans. Therefore, in this thesis, th

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Boubezari, Rayana. "Smartphone to smartphone visible light communications." Thesis, Northumbria University, 2018. http://nrl.northumbria.ac.uk/36194/.

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Visible light communications (VLC) is an emerging technology of optical wireless communications, which has been in the research spotlight recently, thanks to the remarkable development of light emitting diodes. Furthermore, optical camera communications, a timely VLC topic, has earned a great share of researchers'interest in the last few years, given the wide availability of digital cameras. This thesis proposes to merge two separate technologies: image processing and VLC, to create a camera-based VLC system. Moreover, the work presented in this thesis describes a short-range mobile-to-mobile

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Azhar, Ahmad Helmi. "Visible light commuinications using optical OFDM." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:9e4c363b-27ba-4e47-8660-39f4e0a077f8.

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This thesis presents an investigation into designs and developments of indoor visible light communication (VLC) systems using orthogonal frequency division multiplexing (OFDM) schemes. The novel contribution of this thesis is a development of a visible light communication system that incorporates OFDM and imaging-diversity multiple-input multiple-output (MIMO) techniques, which allows robust transmissions on multiple channels at high data rates. The characteristics of VLC systems are presented, one of which is VLC communications channel exhibits high Signal-to-Noise Ratio (SNR). The major cons

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8

Xia, Zhonghua. "Gold(I) Catalysis Under Visible Light." Thesis, Sorbonne université, 2018. http://www.theses.fr/2018SORUS606.

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Cette thèse s'intéresse à l'étude d'un double processus catalytique, la catalyse à l'or et la photocatalyse. Nous avons cherché à synthétiser des dérivés enzofuranique à partir d'o-alkynylphénols et de sels d'aryle diazonium ou d'iodoalcynes en présence d'un mélange catalytique d'un complexe d'or (I) et d'un photocatalyseur sous irradiation à la lumière visible. Dans un premier temps, nous présentons un nouveau procédé de catalyse duale photoredox/or par cyclisation arylative d'o-alkynylphénols avec des sels d'aryle diazonium. Cette réaction s'effectue dans des conditions douces à température

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Chen, Xi. "Noble metal photocatalysts under visible light and UV light irradiation." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/47008/1/Xi_Chen_Thesis.pdf.

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One of the greatest challenges for the study of photocatalysts is to devise new catalysts that possess high activity under visible light illumination. This would allow the use of an abundant and green energy source, sunlight, to drive chemical reactions. Gold nanoparticles strongly absorb both visible light and UV light. It is therefore possible to drive chemical reactions utilising a significant fraction of full sunlight spectrum. Here we prepared gold nanoparticles supported on various oxide powders, and reported a new finding that gold nanoparticles on oxide supports exhibit significant act

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10

Chen, Cheng. "Downlink system characterisation in LiFi Attocell networks." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25420.

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There is a trend to move the frequency band for wireless transmission to ever higher frequencies in the radio frequency (RF) spectrum to fulfil the exponentially increasing demand in wireless communication capacity. Research work has gone into improving the spectral efficiency of wireless communication system to use the scarce and expensive resources in the most efficient way. However, to make wireless communication future-proof, it is essential to explore ways to transmit wirelessly outside the traditional RF spectrum. The visible light (VL) spectrum bandwidth is 1000 times wider than the ent

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Ramakrishnan, Ayyappan. "Visible light induced catalytic sulfoxidation of alkanes." [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=981136915.

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Ma, Hao. "Coordinated transmission for visible light communication systems." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/63348.

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Visible light communication (VLC) is an emerging optical wireless communication technology that employs the light-emitting diode (LED) as the data transmitter. It has great potential to alleviate the strain on the radio-frequency (RF) spectrum in the indoor environment. The integration of VLC into indoor communication networks establishes optical attocells, responsible for the downlink traffic from the network to user terminals. These attocells could be easily deployed wherever LEDs are adopted for general illumination, including in electromagnetic interference sensitive areas like hospitals a

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譚祐怡 and Yau-yee Tam. "Dual use of visible light-emitting diodes." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2000. http://hub.hku.hk/bib/B31223436.

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Talukdar, Sumanta. "Microstereolithography implemented via visible light digital holography." Thesis, University of Sussex, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404209.

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The amalgamation of the technologies of Microfabrication and Rapid Prototyping and Manufacturing is a field that has witnessed a surge of research activity in recent years. This thesis demonstrates the development of a novel microfabrication system characterised by the use of Computer Generated Holograms (CGHs) as part of a StereoLithographic rapid prototyping system in cohesion with applied microfabrication techniques. CGHs are reconstructed using a laser diode operating at a visible wavelength (407nm) and subsequently implemented in the fabrication of a microstructure. The hologram encoding

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Velasquez, Estuardo Rene Garcia. "Sending Location-Based KeysUsing Visible Light Communication." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-310907.

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In this thesis we present a Security Application based on Visible Light Communication(VLC). As VLC continues to develop, the need to protect valuable informationtransmitted using this type of communication is also growing. We aim to protect thisvaluable information by proposing a security application in which the data is encryptedin a multiple-light system and only recoverable in specific locations of a movingpattern within specific time. We use the Shamir Secret Sharing algorithm as basis forthe encryption combined with additional algorithms to provide a more securetransmission. The applicati

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Lourenço, Nuno Rafael Mendonça. "Communication systems using visible light : emitter/receiver." Master's thesis, Universidade de Aveiro, 2009. http://hdl.handle.net/10773/2097.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>A presente dissertação aborda o design de um transdutor optoelectrónico para um sistema de comunicações sem fios que utiliza a luz visível como meio de transmissão. Estes sistemas tiram partido dos conhecimentos tecnológicos existentes sobre sistemas de comunicações sem fios utilizando o espectro dos infravermelhos, e da recente introdução em massa de díodos emissores de luz de elevado brilho em diversas aplicações de iluminação. O trabalho apresentado foi desenvolvido dentro do projecto VIDAS, tendo em conta os respectivos cenários de

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Farias, Gonçalo Nuno Brás. "Low data rate visible light communication system." Master's thesis, Universidade de Aveiro, 2014. http://hdl.handle.net/10773/14542.

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Mestrado em Engenharia Eletrónica e Telecomunicações<br>Recent advances in light emission diodes (LED) technology led them to an important place on lighting systems. This conquer allied to its switching speed permitted the development of new visible light communication systems (VLC), these are included in unguided optical communications. In the past, unguided optical communications were restricted to infrared spectrum due to LEDs ine ciency, but nowadays this is changing. Visible light communication systems can o er viable or complementary alternatives to the existing communication sys

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Tam, Yau-yee. "Dual use of visible light-emitting diodes /." Hong Kong : University of Hong Kong, 2000. http://sunzi.lib.hku.hk/hkuto/record.jsp?B21949001.

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Popova, Marina. "Visible Light-Triggered Carbon Monoxide-Releasing Molecules." DigitalCommons@USU, 2019. https://digitalcommons.usu.edu/etd/7500.

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Carbon monoxide (CO) is now well established as one of the signaling molecules in higher organisms, including humans. Due to its physiological roles, CO is now accepted as a potential therapeutic agent. The use of CO gas has been studied in multiple clinical trials. Vasodilation, anti-inflammatory, anti-apoptotic, anti-proliferative and cytoprotective effects are just a few of the pharmacological actions attributed to CO gas in various models of diseases. Use of inhaled CO gas as a therapeutic has many limitations which necessitate the development of a new approach for CO delivery. In order to

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Tucker, Joseph Walter. "Synthetic applications of visible-light photoredox catalysis." Thesis, Boston University, 2013. https://hdl.handle.net/2144/12865.

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Thesis (Ph.D.)--Boston University PLEASE NOTE: Boston University Libraries did not receive an Authorization To Manage form for this thesis or dissertation. It is therefore not openly accessible, though it may be available by request. If you are the author or principal advisor of this work and would like to request open access for it, please contact us at open-help@bu.edu. Thank you.<br>Reduction and oxidation reactions are some of the most common chemical transformations occurring both in nature and chemical laboratories. The vast majority of redox reaction systems utilized by synthetic chemi

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Lucas, Rodrigues Leona. "Advanced photochemical reactions induced by visible light." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/235925/1/Leona%2BLucas%2BRodrigues%2BThesis%283%29.pdf.

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Nature utilizes the energy of light for chemical transformations such as photosynthesis or the visual systems in human eyes, where wavelengths from predominantly high energetic UV to harmless visible light are consumed by the respective chromophores. Therefore, the herein presented thesis focusses on developing photoreactive molecules responsive to visible light to ensure minimal harm in form of photo-bleaching or degradation to molecules, polymers or materials via three major reaction pathways: light induced ligation, bond-cleavage/rearrangement and isomerization reactions. Here, a particular

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Anutgan, Mustafa. "Nanocrystal Silicon Based Visible Light Emitting Pin Diodes." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612718/index.pdf.

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The production of low cost, large area display systems requires a light emitting material compatible with the standard silicon (Si) based complementary metal oxide semiconductor (CMOS) technology. The crystalline bulk Si is an indirect band semiconductor with very poor optical properties. On the other hand, hydrogenated amorphous Si (a-Si:H) based wide gap alloys exhibit strong visible photoluminescence (PL) at room temperature, owing to the release of the momentum conservation law. Still, the electroluminescence (EL) intensity from the diodes based on these alloys is weak due to the limitatio

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23

Enlund, Åström Isabelle. "Mobility-based Key Sharing Using Visible Light Communication." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-333031.

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Visible Light Communication (VLC) has become an increasingly interesting topicamong researchers. The LEDs used in VLC have important characteristics which differfrom radio waves, and which enables a vast spectrum to be used with many security aspects. Light cannot pass through walls and can be directed. Directing different light sources to different locations, keys can be distributed to these locations. Using this, a mobility pattern can be defined by a user. This thesis considers the Shamir's Secret Sharing algorithm and how it can be used to create a mobility pattern where each distributed k

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Mostafa, Ayman. "Physical-layer security for visible-light communication systems." Thesis, University of British Columbia, 2017. http://hdl.handle.net/2429/61328.

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Visible-light communication (VLC) is an enabling technology that exploits the lighting infrastructure to provide ubiquitous indoor broadband coverage via high-speed short-range wireless communication links. On the other hand, physical-layer security has the potential to supplement conventional encryption methods with an additional secrecy measure that is provably unbreakable regardless of the computational power of the eavesdropper. The lack of wave-guiding transmission media in VLC channels makes the communication link inherently susceptible to eavesdropping by unauthorized users existing

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Windlin, Charles. "Visible Light Communication as a material for design." Thesis, KTH, Människa-datorinteraktion, MDI (stängd 20111231), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-189553.

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Visible light communication (VLC) is a novel complement to Radio Frequency Communication (RFC) and has many applications in wireless communication, indoor positioning and where RFC is not applicable. The problem is that the technology is black-boxed and therefore hard to apply in today’s design process. For designers to be able to use VLC in their creative process, this study uses the Inspirational Bits approach to expose the materiality of VLC by asking the question: How can we design artefacts that allow designers to engage in a conversation with Visible Light Communication as a material? Th

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Gao, Shuo. "Performance Study for Indoor Visible Light Communication Systems." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/23986.

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The field of Optical Wireless Communications (OWC) has seen rapid development during the recent years. This growing popularity is due to several characteristics of considerable importance to consumer electronics products, such as large bandwidth that is also not having spectrum regulations imposed, low cost, and license free operation. As a branch of OWC, visible light communication (VLC) systems have their own unique advantages, with several new technologies, products and patents having been developed during since the end of last century. In this research, a VLC system for indoor application

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Theorell, Axel, and Anton Osika. "Distinguishing Visual Information from Visible Background Light Sources." Thesis, KTH, Tillämpad fysik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-129277.

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This thesis regards problems of the form: Two light sources are present. The two sources have dierent light spectra. One of the sources carries information and the other source can be regarded as background light. How can we maximize the contrast between the information and the background light using optical ltering techniques? A relevant question when working with this problem is the theoretical limit of how big dierence a lter can make. The dierence is calculated with regards to the optimal lter for a particular setup. An algorithm for nding the optimal lter for a given setup is implemented.

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Peard, J. M. "The visible-light induced polymerisation of methyl methacrylate." Thesis, University of Liverpool, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.372728.

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Rae, Katherine Jeanne. "Micro-transfer printing for visible light communications applications." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=29591.

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The work presented in this thesis focuses on the transfer printing of InGaN-based blue emitting light emitting diodes (LEDs) onto various non-native substrates for visible light communications applications. The controlled mechanical integration of photonic structures onto non-native substrates using micro-transfer printing (μTP) techniquesis paving the way to high-performance, heterogeneous and multi-functional integrated photonic devices. 2μm-thick 100μm x 100μm LEDs are transfer printed onto these non-native, capability enhancing, substrates using a modified nano-lithography system. Blue-emi

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Hilmia, Abdalah. "Sending Location-Based Keys Using Visible Light Communication." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-276338.

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In this thesis we explore the possibilities of using Visible Light Communication (VLC) to build a system that is capable of securely sharing small amounts of data in the form of encryption keys in a boundary defined area. We design and implement the MAC and Physical layers of the system. On the transmission part, the system uses BFSK and Manchester encoding to modulate the signal. The reception is handled in windows of fixed size where the Goertzel algorithm is applied to detect the transmitted frequencies. The transmitters synchronize their transmissions using a simple static scheduling metho

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Alsolami, Ibrahim. "Visible light communications with single-photon avalanche diodes." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:744eeb47-8bb6-4776-8b8f-f7b6374d89bd.

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This thesis explores the use of single-photon avalanche diodes (SPADs) for visible light communications (VLC). The high sensitivity of SPADs can potentially enhance the performance of VLC receivers. However, a SPAD-based system has challenges that need to be addressed before it can be considered as a viable option for VLC. The first challenge is the susceptibility of SPAD-based receivers to variations in ambient light. The high sensitivity of SPADs is advantageous for signal detection, but also makes SPADs vulnerable to variations in ambient light. In this thesis, the performance of a SPAD-bas

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Li, Yichen. "Enhancing communication link performance in visible light communication." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25666.

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With data throughput increasing exponentially in wireless communication networks, the limited radio frequency (RF) spectrum is unable to meet the future data rate demand. As a promising complementary approach, optical wireless communication (OWC) has gained significant attention since its licence-free light spectrum provides a considerable amount of communication bandwidth. In conventional OWC systems, the information-carried signal has to be real-valued and non-negative due to the incoherent light output of the conventional optical transmitter, light emitting diode (LED). Therefore, an intens

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Melo, Santos João Miguel. "Hybrid GaN-based optoelectronics for visible light communications." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27924.

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Development of light-emitting diode technology is driven mainly by the need for efficient solid-state lighting, but it is also creating opportunities for new applications such as visible light communications (VLC). Here, the solid-state visible light sources are used to transmit data with the added requirement of a short excited-state lifetime so that sources can be modulated at high speed. This research focuses on hybrid optical sources for visible light communications with an emphasis on novel formats of colour-converters for multi-wavelength photoluminescence as well as white-light generati

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Kumar, Navin. "Visible light communication systems for road safety applications." Doctoral thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/8176.

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Doutoramento em MAP-Tele<br>Esta tese apresenta um estudo exploratório sobre sistemas de comunicação por luz visível e as suas aplicações em sistemas de transporte inteligentes como forma a melhorar a segurança nas estradas. Foram desenvolvidos neste trabalho, modelos conceptuais e analíticos adequados à caracterização deste tipo de sistemas. Foi desenvolvido um protótipo de baixo custo, capaz de suportar a disseminação de informação utilizando semáforos. A sua realização carece de um estudo detalhado, nomeadamente: i) foi necessário obter modelos capazes de descrever os padrões de radiação nu

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Rodrigues, Luís Filipe Abade. "Error correcting codes for visible light communication systems." Master's thesis, Universidade de Aveiro, 2015. http://hdl.handle.net/10773/15887.

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Mestrado em Engenharia Eletrónica e Telecomunicações<br>Over the past few years, the number of wireless networks users has been increasing. Until now, Radio-Frequency (RF) used to be the dominant technology. However, the electromagnetic spectrum in these region is being saturated, demanding for alternative wireless technologies. Recently, with the growing market of LED lighting, the Visible Light Communications has been drawing attentions from the research community. First, it is an eficient device for illumination. Second, because of its easy modulation and high bandwidth. Finally, it can

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Camacho, Pedro Alexandre Armas. "Front-end design for visible light communications systems." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23477.

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Mestrado em Engenharia Eletrónica e Telecomunicações<br>Communications are vital in the world today. Everything is connected and this means that communication technologies are constantly being pushed to their limits. Any kind of development and improvement that can be done to increase networks capabilities, will ﬁnd use in some speciﬁc application, or even in more common technologies if such is justiﬁed. One such case is VLC, it can be used to improve other communication methods capabilities, or as standalone solution, providing advantage in certain scenarios where regular wirelesscommunicatio

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Ireland, Christopher. "Niobium oxide based material for visible light photocatalysis." Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/8713/.

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The primary aim of the work presented in this thesis was to design and synthesise well-characterised material that would exploit visible light to promote photocatalysis, involving the degradation of organic compounds in water, or generation of hydrogen from the water splitting reaction. In doing so, both environmental concerns, such as the removal of pollutants in wastewater, and energy concerns, such as the generation of a clean and safe form of hydrogen for use as a renewable fuel could be addressed. The approach used was to employ existing methods to synthesise high surface area quasi-amorp

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Calisti, Alex. "Simulation of visible light communications in vehicular networks." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7597/.

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The rapid development in the field of lighting and illumination allows low energy consumption and a rapid growth in the use, and development of solid-state sources. As the efficiency of these devices increases and their cost decreases there are predictions that they will become the dominant source for general illumination in the short term. The objective of this thesis is to study, through extensive simulations in realistic scenarios, the feasibility and exploitation of visible light communication (VLC) for vehicular ad hoc networks (VANETs) applications. A brief introduction will introduce th

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Clapp, Paula Jean 1968. "Visible-light induced reactions in lamellar phospholipid assemblies." Diss., The University of Arizona, 1996. http://hdl.handle.net/10150/282185.

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Cyanine photosensitizers are visible-light absorbing dyes commercially useful in photography and available in a variety of structures with tunable redox, absorptivity and excited state properties. The areas of research described in this dissertation all utilize cyanine dyes to photosensitize various processes to visible-light within the confines of lamellar phospholipid assemblies. In Chapter III, an efficient three component, liposome-bound photochemical molecular device for transfer of energy and electrons is described. A porphyrin (free base or metallated) serves as the energy donor, a cyan

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Nagabhairava, Nitish. "Implementation of Visible Light communications For Indoor Applications." Thesis, Blekinge Tekniska Högskola, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-17292.

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In recent years there is growing research in optical wireless communication. This growing popularity isdue to several characteristics like such as large bandwidth that is also not having spectrum regulationsimposed, low cost and license-free operation. Since visible light communications (VLC) is a branch ofoptical wave communications (OWC), it is used for replacing RF communications. The other primaryreason for the use of visible light communications [1], because it uses 400 THz of unlicensed secure andradio free media for wireless communications which are 1000 times more than that of radiocom

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CALAFIORE, GIUSEPPE. "Nanoimprinting of Photonic Devices for Visible Light Applications." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2640840.

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The science of photonics is increasingly enabling the discovery of unprecedented proprieties that stem from the interaction of light with nanostructured matter. On the other hand, nanotechnology provides a key support to the research in photonics. In particular nanoimprint lithography (NIL) proved important to accelerate the development and prototyping of novel photonic device concepts. In this thesis, NIL was analyzed as a suitable, flexible, low-cost lithography solution for photonics. The purpose of this work is to research and evaluate novel nanofabrication technologies, materials and devi

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In, Su-Il. "Catalysts and light : synthesis and application of new, visible light activated photocatalytic materials." Thesis, University of Cambridge, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.612014.

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Shen, Yangyang. "Visible Light Photoredox Promoted Transformations of Inert Chemical Bonds." Doctoral thesis, Universitat Rovira i Virgili, 2018. http://hdl.handle.net/10803/665125.

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L'última dècada ha estat testimoni del desenvolupament dramàtic de la catàlisi de fotògrafs de llum visible, s'han descobert algunes de les transformacions no reconegudes anteriorment i es van iniciar en condicions excepcionalment suaus. Les aplicacions habilitades per la tècnica de photoredox s'han trobat en síntesi orgànica, farmàcia i ciències dels materials. Tanmateix, la funcionalització dels enllaços químics inerts més enllà de la capacitat confinada dels fotocatalizadores convencionals segueix sent menys explorada. Tenint en compte l'interès investigador del grup Martín i el potencial

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Singh, Ravinder. "Physical layer techniques for indoor wireless visible light communications." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/13818/.

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The growing demand for bandwidth-hungry applications and increasing number of smart interconnected devices has increased the data traffic on radio access networks. Subsequently, the saturating spectral efficiencies in crowded radio frequency spectrum has impelled the researchers to exploit the optical spectrum for communications. In particular, many developments in the visible light communication (VLC) as a combined lighting and communications system have taken place. Despite abundant optical bandwidth, the data transmission rates and power efficiencies in VLC are partly limited by the electri

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Ghasimi, Saman [Verfasser]. "Conjugated porous polymers for visible-light photocatalysis / Saman Ghasimi." Mainz : Universitätsbibliothek Mainz, 2017. http://d-nb.info/1123047847/34.

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Li, Xuan. "Design and optimisation of user-centric visible-light networks." Thesis, University of Southampton, 2016. https://eprints.soton.ac.uk/419060/.

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In order to counteract the explosive escalation of wireless tele-traffic, the communication spectrum has been gradually expanded from the conventional radio frequency (RF) band to the optical domain. By integrating the RF band relying on diverse radio techniques and optical bands, the next-generation heterogeneous networks (HetNets) are expected to be a potential solution for supporting the ever-increasing wireless tele-traffic. Owing to its abundant unlicensed spectral resources, visible light communications (VLC) combined with advanced illumination constitute a competent candidate for comple

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Duque, Alexis. "Bidirectional visible light communications for the internet of things." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI072/document.

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Dans cette thèse, nous concevons et étudions un système de communication bidirectionnel par lumière visible (VLC) entre une diode électroluminescente (DEL) de couleur, intégrée à un objet connecté, et un smartphone. Le dispositif est ainsi capable d'envoyer et de recevoir des informations à travers sa DEL, tandis que le smartphone utilise sa caméra pour recevoir des données et son flash pour envoyer des informations. Nous mettons en œuvre et évaluons expérimentalement ce système VLC DEL-à-camera conçu spécifiquement pour les DELs de couleur à faible puissance. En nous appuyant sur les résultat

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Ain-Ul-Aisha, FNU. "Fundamental Limits of Poisson Channels in Visible Light Communications." Digital WPI, 2017. https://digitalcommons.wpi.edu/etd-dissertations/475.

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Visible Light Communications (VLC) has recently emerged as a viable solution for solving the spectrum shortage problem. The idea is to use artificial light sources as medium to communicate with portable devices. In particular, the light sources can be switched on and off with a very high-frequency corresponding to 1s and 0s of digital communication. The high-frequency on-off switching can be detected by electronic devices but not the human eyes, and hence will not affect the light sources' illumination functions. In VLC, if a receiver is equipped with photodiodes that count the number of arriv

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Iyer, Akila. "Visible Light Photocatalysis of N-N Bond Based Compounds." Diss., North Dakota State University, 2016. http://hdl.handle.net/10365/25862.

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The well-established principles of organic photochemistry, offer chemists the fundamental understanding and tools for studying light induced chemical transformations. Employing visible light for photocatalysis, one can design and develop benign routes for the synthesis of new organic materials. In our present investigation, we have developed novel N-N bond based compounds for visible light mediated phototransformations. We have presented synthesis for targeting achiral/chiral N-N bond based compounds and their study for various light driven applications. To name a few applications, these compo

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Chun, Hyunchae. "Multi gigabit/s visible light communications : modelling and demonstrations." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:646e24a9-244b-45de-a528-d4ea788f60da.

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Traffic in wireless communications is expected to increase exponentially due to demands such as multiple up/downloading, and streaming of ultra-high-definition or multi-dimensional content. This demand requires the development of multi-Giga bit/s communication systems. Insufficient radio spectrum is the main barrier to developing such high-speed wireless systems. Visible light communications (VLC) has the potential to overcome this barrier by providing THz of unlicensed spectrum. This thesis reports a new generalized modelling method and demonstrations for multi Gigabit/s VLC. For the optimum

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