Tesis sobre el tema "Plasmonic modulators"
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Abadía, Calvo Nicolás Mario. "Ultra-compact plasmonic modulator for optical inteconnects". Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112353/document.
Texto completoThis work aims to design a CMOS compatible, low-electrical power consumption modulator assisted by plasmons. For compactness and reduction of the electrical power consumption, electro-absorption based on the Franz-Keldysh effect in Germanium was chosen for modulation. It consists in the change of the absorption coefficient of the material near the band edge under the application of a static electric field, hence producing a direct modulation of the light intensity. The use of plasmons allows enhancing the electro-optical effect due to the high field confinement. An integrated electro-optical simulation tool was developed to design and optimize the modulator. The designed plasmonic modulator has an extinction ratio of 3.3 dB with insertion losses of 13.2 dB and electrical power consumption as low as 20 fJ/bit, i.e. the lowest electrical power consumption reported for silicon photonic modulators. In- and out-coupling to a standard silicon waveguide was also engineered by the means of an optimized Si-Ge taper, reducing the coupling losses to only 1 dB per coupler. Besides, an experimental work was carried out to try to shift the Franz-Keldysh effect, which is maximum at 1650 nm, to lower wavelength close to 1.55 μm for telecommunication applications
Demir, Veysi. "Nanocomposites for High-Speed Optical Modulators and Plasmonic Thermal Mid-Infrared Emitters". Diss., The University of Arizona, 2015. http://hdl.handle.net/10150/581130.
Texto completoUmmethala, Sandeep [Verfasser] y C. [Akademischer Betreuer] Koos. "Plasmonic-Organic and Silicon-Organic Hybrid Modulators for High-Speed Signal Processing / Sandeep Ummethala ; Betreuer: C. Koos". Karlsruhe : KIT-Bibliothek, 2021. http://d-nb.info/1239180586/34.
Texto completoSharma, Sumeet. "All Plasmonic Noble Metal Modulator". Thesis, California State University, Long Beach, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10978327.
Texto completoAt present modulators in communications industry utilize non-linear materials like indium tin oxide (ITO) and DLD-164 as a dielectric, which makes the fabrication process cumbersome and expensive. This thesis discusses the possibility of using only gold and air as conductor and dielectric to characterize a signal modulating device. Both electro-absorption modulation (EAM) and phase change driven modulation is possible with the design. For the change in phase a length of 2.992 µm for the modulating arm of a Mach-Zehnder modulator (MZM) was achieved for operation at 525 nm. High absorptions of electromagnetic (EM) waves was seen at the 480 nm mark allowing a length of just 4.95 µm for EAM. The results suggest that an all plasmonic noble metal modulator utilizing air as a dielectric is possible for operation in the visible 400 nm to 700 nm range. The concept is supported by proof-of-principle based simulations.
This thesis proposes a novel idea of an all plasmonic modulator driven by changes in free carrier concentration in gold and surface plasmon polariton (SPP) excitations under an applied potential. The prototype model is simulated using a commercial finite difference time domain solver. The simulation enviro nment allows Maxwell’s equations to be solved in the time domain to investigate light propagation and absorption characteristics under an externally applied electric potential. The free carrier concentration dependent permittivity of gold is exploited to investigate possible applications in nano-photonics and optical communications.
Ansell, Daniel. "Graphene for enhanced metal plasmonics". Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/graphene-for-enhanced-metal-plasmonics(7bb0ffb1-f46f-498e-bb88-9626021f6f58).html.
Texto completoNing, Ding. "Analytical and Numerical Models of Multilayered Photonic Devices". University of Akron / OhioLINK, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=akron1207712683.
Texto completoThomas, Philip. "Narrow plasmon resonances in hybrid systems". Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/narrow-plasmon-resonances-in-hybrid-systems(a2e3a6e8-1055-4e7e-8b35-a597163aacc8).html.
Texto completoHassan, Sa'ad. "Microfabrication of Plasmonic Device: PPBG BIosensor in Cytop, Reflection Itensity Modulator and Atomically Flat Nanohole Array". Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32324.
Texto completoMota, F. "The discovery of small molecule modulators of soluble guanylate cyclase aided by surface plasmon resonance". Thesis, University College London (University of London), 2014. http://discovery.ucl.ac.uk/1434127/.
Texto completoHon, Kam Yan. "Surface plasmon resonance-assisted coupling to whispering-gallery modes in micropillar resonators and silicon microdisk-based depletion-type modulators using integrated schottky diodes /". View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?ECED%202007%20HON.
Texto completoEmboras, Alexandros. "Intégration en technologie CMOS d'un modulateur plasmonique à effet de champ CMOS Integration of a field effect plasmonic modulator". Phd thesis, Université de Grenoble, 2012. http://tel.archives-ouvertes.fr/tel-00848107.
Texto completoPlumereau, Christine. "Utilisation de plasmons de surface à faibles pertes pour la modulation de la lumière par effet électro-optique". Saint-Etienne, 1990. http://www.theses.fr/1990STET4007.
Texto completoBadhwar, Shruti. "Laterally confined THz sources and graphene based THz optics". Thesis, University of Cambridge, 2014. https://www.repository.cam.ac.uk/handle/1810/246259.
Texto completoHaron, Zainal Alam Bin. "A study of the surface plasmon resonance effect in three-phase and four-phase systems and its viability in optical modulator or switching applications". Thesis, University of Newcastle Upon Tyne, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.386715.
Texto completoTrouillet, Alain. "Réalisation de guides optiques plans en polymères non linéaires : application à la modulation électrooptique de plasmons de surface à faibles pertes". Saint-Etienne, 1994. http://www.theses.fr/1994STET4003.
Texto completoMebarki, Lamia. "Recherche ou développement, et caractérisation fonctionnelle et structurale d'effecteurs peptidiques de deux récepteurs membranaires à incidences physiopathologiques". Thesis, Aix-Marseille, 2017. http://www.theses.fr/2017AIXM0217.
Texto completoThe vasopressin V1bR and serotonin 5HT3R receptors play important physiological roles in the detection of extracellular signals, in the mechanisms for neuronal transmission, and in various pathologies including cancer, diabetes, and CNS and PNS diseases. My studies were aimed at generating or finding peptidic modulators of these two receptors. For the V1bR, I developed several antibodies of the VHH type and characterized them biochemically and functionally. One of these VHHs acts as a complete allosteric agonist specific for the human V1bR (hV1bR). In vitro this VHH is able to activate the signaling pathways of inositol phosphate and MAP kinases and to induce the internalization of hV1bR. In pancreatic islets overexpressing hV1bR, it induces an increase in intracellular Ca2+ and a secretion of insulin. For the 5HT3R, using SPR I screened 31 snake venoms on immobilized recombinant receptors and for one of these venoms, evidenced an interaction. Following purification by liquid chromatography and identification by mass spectrometry, I identified a toxin previously characterized as an enzyme with Ca2+-dependent activity. This toxin interacts with the 5HT3R A and AB independently of Ca2+ and with Kd values ≤ 10 nM. Functional analysis by electrophysiology suggests that it acts as a PAM of the 5HT3R channel activity. Images recorded by negative staining EM show that the toxin binds to the 5HT3R extracellular domain, at a distance from the 5HT binding site. Both this VHH and this toxin could be used as pharmacological tools and / or therapeutic agents
Stolz, Arnaud. "Conception, fabrication et caractérisation d'un modulateur optique à commande plasmonique sur nitrure de gallium à une longueur d'onde de 1,55 micron". Phd thesis, Université de Valenciennes et du Hainaut-Cambresis, 2011. http://tel.archives-ouvertes.fr/tel-00677475.
Texto completoChang, Cheng Wei y 張正偉. "Synthesis and applications of visible plasmonic Silver: Far surface plasmon polariton (SPP) propagation, excellent photodegradation, and SPP amplitude modulations". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/64973h.
Texto completo國立清華大學
材料科學工程學系
105
Since surface plasmon polarition (SPP) waves propagate in the definite dielectric/metal region, the propagation loss is an important issue and related to the optical responses like on-resonance states or coupling frequencies. In visible region, plasmonic material Ag has attracted great attentions because of low absorption loss. However, the losses in Ag are not only attributed to the interband or intraband transitions but also to the surface defects and the impurities. We herein develop a fabrication method called HNO3-assisted polyol reduction method that possesses mass production single-crystalline Ag microplates with the largest lateral size up to 50 μm. The growth mechanism and the improved SPP propagation length are investigated, showing that the concentrations of ethylene glycol (EG), HNO3 dominate the growth of Ag microplates and the SPP propagation length is 2 folded longer than the typical E-gun deposited Ag thin film. Such the ultralarge Ag microplates can serve as the low defected, versatile used, buffer layer free plasmonic platform Furthermore, using HNO3-assisted polyol reduction method can control the lateral size of Ag microplates. The use of relatively small size Ag microplates with 3-5 μm is carried out for sinking the photogenerated electrons in the ZnO/Ag heterostrcuture. The growth of ZnO nanowires on Ag microplates shows that the directly contact and the charge transfer effect are confirmed by TEM and XPS observation. The ZnO/Ag contacts can effectively enhance the photocatalytic activity in photoinduced degradation processes, showing that the kinetic constant for our ZnO/Ag heterostructure possesses 1.35 folds than the pure ZnO nanowires. The figure of merit (FOM) value is used for fairly comparing the ability of photodegradation among other ZnO/Ag heterostructure, revealing that our ZnO/Ag heterostructure has a better performance than others (1.02 × 10-2). In the final part, we use metallic Ag and plasmonic Fishbone (FB) structures to develop two kinds of SPP amplitude modulation (SPPAM). One is the use of angular frequency difference to serve as a modulation signal and beats on 1.66 MHz, showing that beat frequency SPPAM works beyond SPP subwavelength region and can be readout by the oscilloscope construction. The other is the use of changing polarization states frequencies and polarization states that can act as the modulation signals in the ranges of 1-10k Hz, showing that the intensity difference between the left/right-sided FB structures with the modulation signals. Taking the advantages of reducing the power consumption and the channel length, we believe that the compact SPPAMs can be used for miniaturizing the modulators and upgrade the 8/16 coding bits to multi-bits.
Chen, Tai-Yu y 陳泰佑. "Development of Soft X-ray Frequency Modulator with Surface Plasmonic Device". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/16420176822471574499.
Texto completo國立中正大學
物理學系暨研究所
103
In optical frequency modulations, acousto-optical modulator (AOM) is one of the important applications to demonstrate such nonlinear effect. Based on the momentum and energy conservation, frequency mixing in AOM is achieved by the interaction of photons and phonons. In the development of x-ray wave-mixing techniques, x-ray sum frequency generation (SFG) has been demonstrated by the interaction of x-ray photons and spatial charges induced by infrared photons in recent researches. The x-ray photons scattered by the oscillating charges at a specific frequency obtain the extra energy in the medium and make x-ray SFG possible. The purpose of this thesis is to develop an innovative soft x-ray frequency modulator based on the interaction of soft x-ray photons and surface plasmons. In this experiment, we propose to utilize an infrared laser to excite surface plasma wave on the surface of a tailor-made aluminum grating and irradiate the grating with a high harmonic generation (HHG) beam. The transmitted HHG is detected by a new design flat field spectrometer (FFS) to resolve the phenomenon of frequency modulation. In this experiment, we can not find any experimental signal from frequency modulations of soft x-rays due the instability of HHG source. However, we have successfully fabricated the free-standing grating for surface plasmon generations, measured the coupling efficiency of the grating and estimated the energy conversion efficiency of soft x-ray SFG. These results will be beneficial to achieve soft x-ray frequency modulation in the following experiment. Key Words: Surface Plasmon, Soft X-ray, Frequency Modulator
Liao, Xinqing. "Surface Plasmon Polariton Based Polarization Modulators Using Metal-polymer Waveguides". Thesis, 2012. http://hdl.handle.net/1807/32256.
Texto completoChu, Chih-Sheng y 朱志昇. "Electro-Optic Light Modulators Based on Waveguide-Coupled Surface Plasmon Resonance". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/51196311676706254257.
Texto completo國立中央大學
機械工程研究所
91
Due to the increasing demand for the development of light modulator with larger bandwidth and higher efficiency in the optical communication, in this thesis we present a novel ultrahigh efficiency and high dynamic response light modulator based on an external applied voltage to modulate the excitation degree of incident waveguide light in surface plasmons (SPs), known as the attenuation total reflection method (ATR method). This waveguide-coupled surface plasmon light modulator is fabricated by spin coating an organic electro-optic (E-O) polymer film onto the metal layer with suitable thickness of 30~40 nm, and then deposited a bottom metal electrode under the polymer. The molecular orientation of E-O polymer is aligned into noncentro-symmetry structure by applying contact poling process. When an external applied electric field created a linear variation of refractive index of poled E-O polymer according to the Pockels effect, the excitation degree of incident waveguide light in surface plasmons is changed and then the reflected light is modulated. Besides, we present in the thesis an optimizing design principle for efficient light modulator through the concentration of engery by waveguide coupled, surface plasmons, electro-optic effect, simulation, and theory analysis. To accurately determine the reflective index, attenuation coefficient, and the thickness of the metal layer, we analyzed the ATR spectra by techniques including Lorentzian equation analysis, Fresnel’s equation data-fitting and optimal linear data analysis. Alternatively, by using least square data-fitting techniques which employ two waveguide mode, we could calculate the refractive index and thickness of electro-optic polymer. We also estimated the attenuation coefficient of the polymer by anaylzing the reflection minimum of ATR spectrum. Finally, we calculated its actual electro-optic coefficient of this modulator by analyzing both E-O pockels effect and ATR spectrum. However, because the modulator fabricated in our experiment is not on optimum condition, the results so far show only 1% modulation in the intensity of the reflected light with driving voltage 30V. Finally, we present a novel and high efficiency electro-optic light modulators based on long range surface plasmon wave coupled with classical surface plasmon wave. Due to the excitation of surface plasmon wave, the energy is concentrated in the waveguide, so the efficiency could be improved. By simulation, it could effectively reduce driving voltage and increase the modulation index of 70 % with driving voltage 10 V.
Chyou, Jin-Jung y 邱進忠. "Electro-optic polymer light modulators based on multiple surface plasmon resonance effects". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/79118417966322255293.
Texto completo國立中央大學
機械工程研究所
94
The improvement on the efficiency of electro-optic (EO) light modulator can be achieved by the optimal design of EO modulating mechanism and the proper selection of EO materials. In this dissertation, two novel high efficiency EO modulators based on multiple surface plasmon resonance (SPR) effects are presented. One of the proposed EO polymeric modulators is based on a novel design in which the degree of coupling of the collimating monochromatic beam into the coupled waveguide-surface plasmon resonance (CWSPR) is electrically varied in order to enhance the modulation efficiency of the device. The other is so called double surface plasmon resonance (DSPR) and based on increasing coupling effect between two surface plasmon resonances via the optimization of the waveguide layer thickness. Both of EO modulators employed the Pockels effect possessed by the poled nonlinear optical organic polymer (NLOP) and the optimization of the thickness of EO thin film. By applying voltage across EO polymer film to vary the refractive index of the EO polymer, the degree of coupling of CWSPR and DSPR is altered and the reflectivity is modulated. The CWSPR EO modulator consists of a high refractive index prism, a thin metal film, a poled polymer layer, and metal electrode. By optimizing the thickness of the EO polymer, the coupling effect of the SPR and the waveguide coupled resonance (WCR) which induced by the Fabry-Perot (F-P) interference within EO polymer can be enhanced. As a result, the CWSPR EO modulator is able to operate with less modulation voltage and achieves better modulation efficiency. The DSPR EO modulator consists of a high refractive index prism, a thin metal film, a poled polymer layer, thin metal electrode, and EO film. In the same way, by optimizing the EO polymer thickness, the coupling effect of the short-range surface plasmon resonance induced at top metal interface and the long-range surface plasmon resonance induced at bottom metal interface will be enhanced and the modulator then yields a better efficiency. The EO polymer light modulator based on SPR-related principles offer the advantage of less insertion loss due to its shorter interaction length. This dissertation sequentially introduce the principles of SPR, the dispersion relation of multilayer system, the fundamentals of the modulator, the theoretical study and simulation concerning the relationship between the efficiency of modulator and the thickness of EO film. The determination of the refractive indexes and thicknesses for the various films, which is required for the fabrication of EO polymer modulator possessed with multilayer structure, can be achieved by employing the home-made SPR sensing technique and an improved data analysis method. In the similar approach, the SPR sensing technique is also capable of measuring the EO properties of the poled polymer film. This will greatly simplify experimental procedure. Since the NLOPs offer the advantages of having large EO constants, low dielectric constants, the simplicity to be fabricated, low cost, the diversity of synthesis and being compatible with integrated circuits, they are considered to be the most promising materials for the development of EO light modulator. Due to the aforementioned strengths offered by EO polymer, the EO polymers used in this project include two NLOP materials, one nonlinear optical organic polymer is a polymethyl methacrylate polymer (PMMA) side-chained with DANS (4, 4’-aminnonitroazobenzene) chromophore (DANS-PMMA) which synthesized and fabricated by our lab and the other is a side-chained EO polyimide with 2-(N-ethyl-4-(tricyanovinyl)anilino)ethanol chromophore. Based on using the foregoing principles, we have implemented two CWSPR EO modulators with these two NLOP materials. The modulators are characterized, and their performance is tested, in terms of the optical properties of the polymer thin film, the EO coefficient, the insertion loss, and the modulation index. Additionally, the dynamic response of the EO light modulator is also investigated and discussed.
Chen, Meng-Ting y 陳孟廷. "Study on surface plasmon resonance light modulator using a grating coupler". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/ss86zt.
Texto completo國立虎尾科技大學
光電與材料科技研究所
98
In this study, we used two commercialized optical simulation software programs, EM Explorer and GSolver, to conduct simulation. Calculations in the simulation were based in a finite difference time domain (FDTD) and using the rigorous coupled wave analysis (RCWA) algorithm. To confirm whether if the calculations performed by the software consisted with the theory, the Kretschmann configuration and metal grating structure were simulated, respectively. The results were then compared with the theoretical calculations of the Fresnel equation. The results showed that the calculated results by the two software programs met with the theory. Further on we simulated and designed two types of grating coupler electro-optic modulators. The first type was an inverse grating structure, where simulation results showed the resonance angle was 22.98°, full width at half maximum (FWHM) was approximately 0.07°. When the refractive index of the EO polymer layer changed to 0.0015, the resonance angular shift was 0.06°. The incident angle was fixed at 22.98°, with an applied 9.09 V to enable the reflectivity change from 4 % to 69 %, which a voltage around 4.5 V can achieve 50% of modulation index; the second was a grating coupler with a long-range surface plasmon structure. Simulation results showed the resonance angle was 35.81°, FWHM approximately 0.05°. When the refractive index of the EO polymer layer changed to 0.0007 the resonance angular shift was 0.06°. The incident angle was fixed at 35.81°, with an applied 10.61 V to enable the reflectivity change from 1% to 60 %, which a voltage around 5 V can achieve 50 % of modulation index.
TENG-HAN, YANG y 楊登翰. "surface plasmon resonance with liquid crystal to resonate the modulator design characteristic research". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/07555418172243775626.
Texto completo國防大學中正理工學院
電子工程研究所
94
The main purpose of this dissertation is to study the characteristic of the surface The main purpose of this dissertation is to study the design and application of optic-electro (O-E) modulator applied on the characteristic of the surface plasmon resonance. Through liquid crystal inspiration on surface plasmon resonance configuration, we investigate luminous intensity modulation of He-Ne Lasers. The research including: (1)Discuss the working voltage of the modulator. (2)Performance evaluations on the modulation of electrical signals. (3)Search the application in optic-electro (O-E) modulator. The simulation results funded that after incident light reflective through LC O-E modulator, which inspirited by the surface plasmon resonance, we could modulate luminous intensity in the way of inputting an electrical signal. Under this situation we used external voltage to modulate intensity variation of reflective light. The higher voltage is, the stronger reflective light was. On the other side, the lower of voltage, the weaker of reflective light. The results are applied on the O-E modulator and the modulated index of the LC SPR O-E modulator increases with higher voltage. When the voltage is increased to 10V, the modulated index of red laser (wavelength = 632.8nm) can be up to about 66%. In this research, the LC SPR O-E modulator with a broadband operating is around 1~10MHz. The LC O-E modulator under our design can transmits different broadband signal at the same time. In the thesis, the modulator can modulate voltage by DC Offset to improve the characteristic of output optical signal. Output optical signal comes out various distortions upon various applied working frequencies; even comes out the effect of harmonic generation. This phenomenon can be improved effetely by DC Offset modulation. Furthermore, it can apply on signal transmittal application practically. As a result, the SPR O-E device is in highly possibility. The application on other field is also our focus direction in the future. Thus, we respect further study could make optic-electro (O-E) in highly performance with high frequency, low voltage, high stability and practicability.