Дисертації з теми "PEDOT Surface"
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Garnier, Jérôme. "Polymer electrochromism and surface plasmons combined on metallic diffraction gratings." Thesis, Linköping University, Department of Science and Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-11522.
Повний текст джерелаAll conducting polymers are potentially electrochromic, owing to the injection of charge carriers that changes their electronic structure and results in a shift of their optical absorption towards higher wavelengths. PEDOT-PSS and PEDOT-S are very promising materials in terms of electrochromic properties, due to the good contrast existing between their doped and undoped forms. However this contrast has to be enhanced in order to design more efficient electrochromic devices, and new solutions should thus be found in order to solve this issue.
Surface plasmons are described as electromagnetic waves propagating along the surface between a dielectric and a metal. Coupled to an incident radiation, they create an energy loss in the light transmitted and reflected by the interface. When the metallic surface is periodically corrugated, this absorption phenomenon due to plasmonic resonance occurs at a specific wavelength that depends on several parameters, such as the incidence angle, the dielectric constants of the two media and the grating period. By coating metallic gratings with electrochromic polymers, we may thus be able to trigger a plasmonic absorption at a given wavelength and shift it upon reduction or oxidation of the material.
Electrochromic devices consisting of PEDOT-PSS or PEDOT-S spin-deposited on gold and silver gratings were investigated by UV-visible reflectance measurements. The periodically corrugated structures were reproduced from commercial gratings by soft nanolithography and were analyzed by AFM. Some electrochromic cells exhibited new colors or a high shift of the plasmonic resonance upon redox switching of the polymer film. Depending on the step and the nature of the grating employed, this shift could reach 20 nm in the case of PEDOT-PSS and more than 100 nm for PEDOT-S. A theoretical model was found to predict the wavelength of plasmonic excitation and the orientation of the shift.
Dogan, Uzeyir. "Preparation And Characterization Of Surface Enhanced Raman Scattering Substrate Through Electro Deposition Of Silver-pedot Film On Ito Glass Surface." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613667/index.pdf.
Повний текст джерелаmoreover, even single molecule detection can be possible. In this study, a novel surface enhanced Raman scattering (SERS) substrate was prepared in two steps: In the first step, ethylenedioxythiophene (EDOT) monomer was polymerized electrochemically onto indium tin oxide (ITO) coated glass. In the next step, silver ions were reduced electrochemically onto surface prepared in the previous step.In the substrate preparation part, the reduction potential of silver ion, the concentration of silver ions in solution, the polymer film thickness and reduced silver amount on substrates were optimized to get the best SERS performances from substrates. The prepared substrates were characterized by cyclic voltammetry (CV), ultraviolet-visible (UV-Vis) spectroscopy, scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDX) attached to SEM. In the SERS performance investigation part, homogeneity and the shelf life of the prepared silver-PEDOT substrates were tested. Homogeneity is very important in terms for the applications of Raman technique in quantitative analysis since most of the reported substrates are lack homogeneity consideration, our study will be an important contribution to the literature. The stability of the substrate was investigated for a period of one month. The very small change in the signal at the end of one month indicated that the substrate can be used even longer time with high efficiency. In all the studies, brilliant cresyl blue (BCB) is used as a model compound. Some important Raman active chemicals, namely, rhodamine 6G (R6G) and 4-mercapto benzoic acid (4-MBA) were detected by using the prepared substrates.
Cao, Zhixiong. "Silver nanoprisms in plasmonic organic solar cells." Thesis, Ecole centrale de Marseille, 2014. http://www.theses.fr/2014ECDM0015/document.
Повний текст джерелаNowadays there has been a strong global demand for renewable and clean energy due to the rapid consumption of non-renewable fossil fuels and the resulting greenhouse effect. One promising solution to harvest clean and renewable energy is to utilize solar cells to convert the energy of sunlight directly into electricity. Compared to their inorganic counterparts, organic solar cells (OSCs) are now of intensive research interest due to advantages such as light weight, flexibility, the compatibility to low-cost manufacturing processes. Despite these advantages, the power conversion efficiency (PCE) of OSCs still has to be improved for large-scale commercialization. OSCs are made of thin film stacks comprising electrodes, electron transporting layer, active polymer layer and hole transporting layer. In this study, we are concerned with PEDOT:PSS layer which is commonly used as a buffer layer between the anodic electrode and the organic photoactive layer of the OSC thin film stack. We incorporated different concentrations of silver nanoprisms (NPSMs) of sub-wavelength dimension into PEDOT:PSS. The purpose is to take advantage of the unique optical properties of Ag MPSMs arisen from localized surface plasmon resonance (LSPR) to enhance the light harvest and the charge generation efficiency by optimizing absorption and scattering of light in OSCs. We found that the key factors controlling the device performance of plasmonic solar cells include not only the optical properties but also the structural and electrical properties of the resulting hybrid PEDOT:PSS-Ag-NPSM-films. On one hand, the addition of Ag NPSMs led to (1) an increased optical absorption; (2) light scattering at high angles which could possibly lead to more efficient light harvest in OSCs. On the other hand, the following results have been found in the hybrid films: (1) the surface roughness was found to be increased due to the formation of Ag agglomerates, leading to increased charge collection efficiency; (2) the global sheet resistance of the hybrid films also increases due to the excess poly(sodium styrenesulphonate) introduced by incompletely purified Ag NPSMs, resulting in lower short circuit current (Jsc); (3) the Ag nanoprisms and their agglomerates at the PEDOT:PSS/photoactive layer interface could act as recombination centers, leading to reductions in shunt resistance, Jsc and open circuit voltage (Voc). In order to partially counteract the disadvantage (2) and (3), by incorporating further purified Ag NPSMs and/or a small amount of glycerol into PEDOT:PSS, the sheet resistance of hybrid PEDOT:PSS-Ag-NPSM-films was reduced to a resistance value comparable to or lower than that of pristine film
IQBAL, KASHIF. "Study of Rheological Behaviour of Coating Paste containing conductive polymer complex." Thesis, Högskolan i Borås, Institutionen Textilhögskolan, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-20146.
Повний текст джерелаProgram: Magisterutbildning i textilteknologi
Sekli-Belaidi, Fadhila. "Fonctionnalisation de surfaces d'électrodes par un film de poly (3,4-éthylènedioxythiophène) PEDOT pour l'élaboration de microcapteur spécifique des acides ascorbique et urique : application à l'étude des propriétés antioxydantes du sérum sanguin." Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1144/.
Повний текст джерелаAscorbic (AA) and uric (UA) acids are of a great biological interest considering the various physiological roles they play (antioxidants, cofactor of hydroxylation, marker of the purins metabolism). In medicine, the assay of both molecules contributes to the establishment of diagnosis and therapies. In alternative to the traditional methods currently used (high performance chromatography liquid and spectrometry), which are generally time consuming and often require costly materials, complex experimental protocols and sample pretreatment, the aim of this work is to develop a voltammetric microsensor functionalized by a electrogenerated conducting polymer (3,4-ethylenedioxythiophene) PEDOT. This sensor made possible a selective and sensitive simultaneous detection of both acids. The study of the electropolymerization parameters (PEDOT film thickness, electropolymerization potential range, monomer concentration) and of the electrochemical measurements parameters (potential scan rate) allows the optimization of the analytical performances of the microsensor (sensitivity, limit of detection and linear range). The study highlighted also an EC’ mechanism of regeneration of uric acid by ascorbic acid in the vicinity of the electrode. Electrochemical assay of the two acids was finally performed in the human blood serum without any preparation of the sample. The results are in very good agreement with those of the standardized chromatographic and enzymatic methods
Tran, Tuan A. "Extrinsic Fabry-Perot interferometer for surface acoustic wave measurement." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-10242009-020318/.
Повний текст джерелаLee, Kyung-Woo. "Fiber Fabry-Perot interferometer (FFPI) sensor using vertical cavity surface emitting laser (VCSEL)." Diss., Texas A&M University, 2005. http://hdl.handle.net/1969.1/4221.
Повний текст джерелаHodiak, Justin Hannah. "Design of fiber-coupled surface-normal fabry perot electroabsorption modulators for analog applications /." Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9936831.
Повний текст джерелаRichard, William. "Nouvelle stratégie de fonctionnalisation de surfaces d'électrodes à base de sels de diazonium : application aux capteurs à antioxydants." Toulouse 3, 2013. http://thesesups.ups-tlse.fr/2231/.
Повний текст джерелаThe work here discussed is a fundamental study of the electrochemical reduction of the 4-nitrobenzene diazonium (NBD). Mechanistic and kinetic studies shed some light on the parts of the NBD reactivity and completed literature data about the subject. An NBD-functionalized antioxidant sensor has been envisaged, allowing the assay of ascorbic acid (AA). In a second time, a combined functionalization using a diazonium salt and a conductive polymer, the polyethylenedioxythiophene (PEDOT) coupled diazonium stability and electrocatalytic properties of PEDOT towards AA and uric acid, two major antioxidants. The modification parameters optimization of the interface and analytical performances determination highlighted the influence of the polymer structure on the sensor response
Manca, Benedetto [Verfasser], and Franz [Akademischer Betreuer] Pedit. "DPW potentials for compact symmetric CMC surfaces in the 3-sphere / Benedetto Manca ; Betreuer: Franz Pedit." Tübingen : Universitätsbibliothek Tübingen, 2019. http://d-nb.info/119063967X/34.
Повний текст джерелаCostantini, Daniele. "Generation and amplification of surface plasmon polaritons at telecom wavelength with compact semiconductor-based devices". Thesis, Paris 11, 2013. http://www.theses.fr/2013PA112036/document.
Повний текст джерелаThe field of plasmonics is experiencing a rapid development, due to the interest in studying the behavior of light at the nanometer scale. Key ingredients of plasmonics are the surface plasmons (SPs), electromagnetic modes localized at the interface between a metal and a dielectric. SPs rely on the interaction between electromagnetic radiation and conduction electrons at metallic interfaces or in "small" metallic nanostructures. The recent intense activity on plasmonics has been also enabled by state-of-the-art nano fabrication techniques and by high-sensitivity optical characterization techniques. These tools pave the way to promising applications (integration in electronics, chemical and biological detection...), which exploit the SP peculiarity of confining optical fields over sub-wavelength mode volumes. The number of publications concerning plasmonics has been continuously increasing over the last twenty years giving rise to a dynamic research context. Several plasmonic devices have been demonstrated during the last years (modulators, couplers, detectors ...). However their integration is limited by the absence of a compact generator (electrical pumping, small dimensions) and by the huge ohmic losses. Standard techniques for surface plasmon polariton (SPP) generation need an external alignment with a laser source on a prism or on a grating. Our approach is based on semiconductor lasers sources with a transverse magnetic (TM) polarization. Therefore, it is possible to obtain compact semiconductor devices suitable for the on chip integration. During my thesis I studied experimentally and numerically the performance of a diode laser as a function of the metal distance from its active region. The proximity of the gain to the metal is necessary to realize active plasmonic devices. I demonstrated the generation and the amplification of SPP in the telecom range (λ=1.3µm) with compact semiconductor based devices, operating at room temperature and by electrical injection. I realized an elegant architecture with an integrated coupler grating for the SPP generation. The SPPs are directly accessible at the device surface. An ultra-thin cladding device allowed the demonstration of a hybrid plasmonic laser with a consistent fraction of electric field at the metal/semiconductor interface. Finally I demonstrated that the metal patterning allows a loss reduction, decreasing the laser threshold. The results are strengthened by a new near-field technique (NSOM) which permitted to measure the SPPs at the metal/air interface and at the metal/semiconductor interface. Thanks to the NSOM we showed unambiguously the effect of the metal patterning on the optical mode
Liu, Quan. "Enhanced Emission of a Single Quantum Emitter Coupled to a Microcavity and a Nanocavity." Thesis, Troyes, 2021. http://www.theses.fr/2021TROY0029.
Повний текст джерелаThe development of single molecule-based techniques in the last decades has enabled directly selecting, tracking, and measuring an individual molecule. In this thesis, the structural dynamics of a single quantum emitter, served by hypericin, is characterized. By using confocal scanning microscopy combined with radially/azimuthally polarized laser modes, three-dimensional reorientation of the transition dipole moment of a single molecule is observed. To quantify the temporal properties of the tautomerism, photon autocorrelation function is used to extract the intensity fluctuations. The results show the distinct influence of the local environment, such as PVA matrix and deuteration effect. The local photonic environment of a molecule is modified by the microcavity/nanocavity. A significant change of the radiative emission rate and of the fluorescence spectra is discussed. It allows us to measure the absolute quantum yield by using a tunable microcavity. The results show the possibility of controlling tautomerization by changing the photonic environment. Subsequently, molecular dissociation is discussed by single molecule surface-enhanced Raman spectra profiting from near field enhancement of nanocavity. A fast experimental optimization strategy towards optimal fluorescence enhancement is outlined
Costantini, Daniele. "Génération et amplification de plasmon polaritons de surface aux longueurs d'onde télécom au moyen de dispositifs compacts à semi-conducteur." Phd thesis, Université Paris Sud - Paris XI, 2013. http://tel.archives-ouvertes.fr/tel-00828337.
Повний текст джерелаGomes, Rossin Bruna. "Estudo das substâncias húmicas em pedo-paisagem podzolizada na bacia do Alto Rio Negro- AM, Brasil." Thesis, Toulon, 2017. http://www.theses.fr/2017TOUL0022.
Повний текст джерелаThe purpose of this study is understaning the behavior of fulvic and humic acid fractions in a podzolized soilssystem, taking into account soils characteristics and to investigate the complexing capacity of Cu + 2 and Al + 3.For this purpose, conventional pedology and spectroscopic methods, Uv-Visible absorbance Spectroscopy, FourierTransform Infrared Spectrometry (FTIR) and Quenching Fluorescence using the CP/PARAFAC treatment wereused to achieve the objectives: (i) to determine the stages of transformation of the pedo-landscape through thestudy of soils and the spatial distribution of podzolized soils and gleysol in a drainage basin; (ii) to characterize SHand to understand the distribution patterns of fulvic and humic acids in a podzolized soil sequence along a slopeand in the horizons along the soil profiles taking into account the morphological characteristics, texture, pH, carbontotal and groundwater variation in the horizons of the soils of a sequence of podzols soils; (iii) to study thecomplexing capacity of humic substances (fulvic and humic acids) of podium soils samples in the Alto Rio NegroBasin, by identifying the fluorescent components of humic substances, evaluating capacities and complexingconstants of these substances with the Cu + 2 and Al + 3 metals, and the comparison with the functional groupsobtained with FTIR. Although fulvic acids are more aromatic and condensed their character is predominantlyaliphatic and hydrophilic and secondarily aromatic and carboxylic. Humic acids are less aromatic and lesscondensed than fulvic acids and are characterized by polysaccharide and ether/alcohol functions, but secondarilytheir character is aliphatic and hydrophilic. These differences are related to the presence of the functional groupsthat are responsible for the differences in the complexation dynamics of the metals, in the humic acids complexesCu+ 2 and Al+ 3 are associated with the functional groups ether/alcohol and CO polysaccharides while in the fulvicacids the correlation is greatest with the functional groups -CH, -OH and carboxylic COOH
Dos, Reis Gabriel. "Sur les surfaces dont la courbure moyenne est constante." Paris 7, 2001. http://www.theses.fr/2001PA077187.
Повний текст джерелаMiddendorf, John Raymond. "Novel Devices and Components for THz Systems." Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1400252710.
Повний текст джерелаSantos, Pablo Grahl dos. "Mineralogia, gênese e relações pedo geomórficas de solos desenvolvidos de litologias das formações Pirambóia, Sanga-do-Cabral e Guará na região sudoeste do Estado do Rio Grande do Sul." Universidade do Estado de Santa Catarina, 2015. http://tede.udesc.br/handle/handle/2627.
Повний текст джерелаMade available in DSpace on 2018-03-23T16:50:55Z (GMT). No. of bitstreams: 1 PGCS15DA035.pdf: 8233837 bytes, checksum: 2bf2d66cbb50bb2bfe83751d86a81f26 (MD5) Previous issue date: 2015-09-25
Capes
The sustainable use of natural resources, with emphasis on soil exploration in conservation base, demand for detailed information on their characteristics and properties, as an indication of its quality, to recommend the correct land use and the best management system. The study aimed to characterization of the nature and properties of the main soils in the southwestern region of the State of Rio Grande do Sul – Brazil, establishing relationships between the physical and chemical attributes with your mineralogical constitution, and researching the causes of the variability of soil classes resultant from the dynamics of the processes considering the lithological variation and modeled of topographic surface. The area studied is situated in the Basin of Santa Maria River in Rosario do Sul County located at latitude 30°15'28" south and longitude 54°54'50" west, with an average altitude of 132 m, humid mesothermal climate, average annual temperature near to 20°C, and a rainfall in the range of 1300 mm. The cartographic base consisted of topographic charts, geological map, satellite imagery, digital elevation models, and support from global positioning system receivers and geographic information system. Geomorphometric variables maps were used for the correlation of the geomorphic surfaces with pedogenesis applying classic models to the compartmentalization of slopes. Topolithosequence were defined as from soil developed with lithology of the Pirambóia, Sanga-of-Cabral and Guará geological formations, choosing to the soil profiles based on types of source material, variations in relief and altitude. It was proceeded a general and morphological description of soil profiles and a horizons sampling collection for chemical, physical, mineralogical and sedimentological analysis, aiming to study the influence of relief forms and the different source materials in the genesis and mineralogical composition of the soil, as well as to understand and describe the main pedogenic processes actants in their evolution. It was observed that soils developed in the same geological formation, in function to lithological variations of the sedimentary package, can have different chemical and mineralogical composition. Furthermore, the differences between the soils also are due to the strong interaction of the source material to the type and intensity of pedogenic processes, influenced by the position they hold in the landscape, conditioned by the flow of water in the soil, as presumably have evolved under the same preterit climatic conditions
O uso sustentável dos recursos naturais, com ênfase na exploração do solo em base conservacionista, demanda por informações pormenorizadas das suas características e propriedades, como um indicativo da sua qualidade, para recomendar o uso correto do solo e o melhor sistema de manejo. O estudo teve como objetivo geral a caracterização da natureza e das propriedades dos principais solos da região sudoeste do RS, estabelecendo relações entre os atributos físicos e químicos com sua constituição mineralógica, e investigando as causas da variabilidade das classes de solos decorrentes da dinâmica dos processos, considerando a variação litológica e o modelado da superfície topográfica. A área de estudo está situada na bacia hidrográfica do Rio Santa Maria na cidade de Rosário do Sul-RS localizada a 30° 15′ 28″S e 54° 54′ 50″W, altitude média de 132 m, clima tipo Cfa, temperatura média anual próxima a 20 °C e índice pluviométrico médio de 1300 mm. A base cartográfica básica consistiu de cartas topográficas, mapa geológico, imagens de satélite, modelos digitais de elevação e apoio de receptores GPS e de SIG’s. Mapas de variáveis geomorfométricas foram utilizados para a correlação das superfícies geomórficas com a pedogênese aplicando-se modelos clássicos de compartimentação de vertentes. Foram definidas topolitossequências a partir de solos desenvolvidos de litologias das formações geológicas Pirambóia, Sangado- Cabral e Guará, escolhendo-se os perfis de solos com base em tipos de materiais de origem, variações no relevo e na altitude. Procedeu-se à descrição geral e morfológica dos perfis e a coleta de amostras de solo deformadas em cada um dos horizontes para análises químicas, físicas, mineralógicas e sedimentológicas, visando estudar a influência das formas de relevo e dos diferentes materiais de origem na gênese e na composição mineralógica dos solos, assim como compreender e descrever os principais processos pedogenéticos atuantes na sua evolução. Observou-se que solos desenvolvidos da mesma formação geológica, em função de variações litológicas do pacote sedimentar, apresentam composição química e mineralógica diferente. Além disso, as diferenças entre os solos também se devem à forte interação do material de origem com o tipo e intensidade dos processos pedogênicos, influenciados pela posição que ocupam na paisagem, condicionados pelos fluxos de água no solo, já que supostamente evoluíram sob as mesmas condições climáticas pretéritas
Bahsoun, Hadi. "Electronic strong coupling of molecular materials in the liquid phase." Thesis, Strasbourg, 2017. http://www.theses.fr/2017STRAF030/document.
Повний текст джерелаThis thesis contributes to the fundamental understanding of the phenomenon of strong coupling of light with organic molecules by implementing new systems and techniques in order to investigate property modifications of molecules coupled with photonic resonances. State-of-the-art nanofabrication techniques for the formation of large hole-array gratings in metals and nanofluidic Fabry-Perot (FP) cavities are presented. These systems were then invested to study, under strong coupling, surface and bulk properties modifications of organic molecules in the solid and liquid phase. In particular, electronic transitions of cyanine dye molecules in liquid solutions were coupled to resonant photonic modes of specially designed nanofluidic FP cavities. Their strong coupling has led to an enhancement of the emission quantum yield, highlighting the radiative nature of the associated polaritonic states
LIU, CHE-CHUN, and 劉哲君. "Surface characterization of PEDOT derivitives nanohybrids by electro-chemical polymerization." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/76526652889962683851.
Повний текст джерела明志科技大學
材料工程系碩士班
105
Nanohybrids of poly(3,4-ethylenedioxythio phene) (PEDOT) derivitives were prepared by electro-chemical polymerization, including PEDOT-graphene oxide (GO), PEDOT- polystyrene sulfonates, (PSS). Graphene oxide nanosheets were fabricated through modified-Hummer methods by graphite sheets. EDOT monomers with GO nanosheets, or polystyrene sulfonates, (PSS) were mixed homogenously and then electro-chemical polymerized on SUS316L stainless steel substrate. After PEDOT-GO were prepared by electro-chemical polymerization, using polymer poly-diallyldimethylammonium chloride, PDDA grafted on PEDOT-GO thin film surface to fabricate PEDOT-GO-PDDA. The morphology and self-assembly behavior of PEDOT-GO, PEDOT-PSS and PEDOT-GO-PDDA conductive polymer nanohybrids would be evaluated by scanning electron microscopy (SEM), Energy dispersive x-ray spectroscopy (EDX), Raman spectroscopy, Water contact angle, Atomic force microscope (AFM), Zeta potential, X-ray diffractometer (XRD), and X-ray photoelectron spectroscopy (XPS). It shows different chemical structure and binding energy of PEDOT nanohybrides with different addition of GO, PSS or, GO-PDDA by EDS, Raman and XPS analysis. The results prove self-assembly with PEDOT, GO, PSS and GO-PDDA. The results show that the excellent antibacterial capability in the PEDOT-GO-PDDA nanohybrids due to the strong charge interaction between the positive charges of PDDA and the negative charges of bacterial cell walls, measured by zeta potential. In contrast, PEDOT-PSS nanohybrids display the wonderful anti-fouling capability owing to the excluded smooth roughness. The surface characterizations of PEDOT could be modulated by adding graphene oxide-based nanosheets, PSS or grafting PDDA, which might have a potential for bio-interface coating and biomedical device applications, such as antibacterial coating, eluting stents or biosensors.
Dash, Sthitaprajna. "Electrocatalytic Oxidation of Organic Molecules on Nanostructured Metals on PEDOT Surface." Thesis, 2014. http://etd.iisc.ac.in/handle/2005/4099.
Повний текст джерелаPIZZI, ELISA. "Synthesis, characterization and functionalization of PEDOT conducting systems on ethylene vinyl alcohol copolymer supports and derivatives." Doctoral thesis, 2014. http://hdl.handle.net/11573/647627.
Повний текст джерелаTsai, Hong-Sin, and 蔡宏欣. "Biosensing Sensitivity Study in Surface Plasmon Resonance and Fabry-Perot Interference." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/22895586805610428204.
Повний текст джерела國立臺灣科技大學
電子工程系
104
Biosensors need to own the capability to recognize the biomolecules immobilized to the surface as the sensing element. Through biological interactions and matching molecules the specificity and high sensitivity for analyte could be demonstrated in optical, electrical, and magnetic properties with qualitative or quantitative composition analysis. Surface plasmon resonance (SPR), occurring in the interface between the metal film and the dielectric material, demonstrates the characteristics of label-free, immediate inspection, specificity and high sensitivity. There are three coupling approaches in SPR : grating, optical waveguide, and prism coupling. In this thesis, a prism coupling with the telecommunication wavelength modulation, deeper penetration depth and higher sensitivity than traditional optical source, is utilized to demonstrate SPR biosensing. The analytes will include the large molecules MTB DNA (about hundreds of nucleotides) and small molecule miRNA-21 (about 21 to 25 nucleotides) through the SPR wavelength modulation and Fabry-Perot interferometer (FPI) for sensitivity comparison. The Fourier filtering function of Origin software and matlab are also used for data analysis, respectively, for SPR and FPI. The experimental data show that the immobilized probe gets higher sensitivity. A comparison and analyses between SPR and FPI will be further studied. The longer wavelength owns the good sensitivity on the large molecule. Our data successfully demonstrate the significant signal from small molecule biosensing under telecommunication wavelengths.
Pan, R. S., and 潘瑞祥. "Optimization Design of Surface-Normal Electroabsorption Modulator using Asymmetric Fabry-Perot structures." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/41817985779417199299.
Повний текст джерела國立成功大學
電機工程研究所
82
External optical modulators are essential for long-haul optical fiber transition systems,in lightwave communication, optical signal processing and sensor applications.Particularly ,modulators having a multiple-quantum-well (MQW) structure are expected to be high-performance external modulators due to the large electroabsorption effect (the quantum confined Stark effect) and low chirping effects. In our search,we will demonstrate the low chirping in the (M)QW electroabsorption( EA) modulators and consider the theoretical design optimization of the surface normal incident electroabsorption modulators using the asymmetric Fabry-Perot structure.The maximun change in the absorption coefficient may be at some wavelength under some electric field for each well size and the corresponding magnitude of the chirping parameter is very smaller than 1 for (M)QW.The MQW EA modulator is design to maximize the ratio of absorption Change and the sqrare of field. The optical analogy modulator require low insertion loss, high contrast ratio(CR),small drive power.We presented a systematic approach to design the total performance of normal incident AFPM based on the quantum-confined Stark effect.
Covey, John Luther. "Ultrafast all-optical switching via grating-based fabry-perot resonators and surface normal fiber-to-waveguide couplers." Thesis, 2014. http://hdl.handle.net/2152/28046.
Повний текст джерелаtext
"Plasmonic-based Label-free Detection and Imaging of Molecules." Doctoral diss., 2011. http://hdl.handle.net/2286/R.I.9392.
Повний текст джерелаDissertation/Thesis
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Ph.D. Electrical Engineering 2011
FUSCALDO, WALTER. "Advanced radiating systems based on leaky wave and nondiffracting waves." Doctoral thesis, 2017. http://hdl.handle.net/11573/943920.
Повний текст джерела