Tesis sobre el tema "Optical guiding"
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Alvi, Bilal Ahmad. "Fabrication and light guiding of special optical fibres". Thesis, University of Salford, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.333980.
Texto completoDepaoli, Damon y Damon Depaoli. "Guiding deep brain stimulation neurosurgery with optical spectroscopy". Doctoral thesis, Université Laval, 2019. http://hdl.handle.net/20.500.11794/37637.
Texto completoSavoir différiencier les différentes types de tissus représente un aspect important lors d’interventions médicales, que ce soit pour aider au diagnostic d’une maladie ou pour le guidage chirurgical. Il est généralement très difficile de distinguer les tissus sains des tissus pathologiques à l’oeil nu et la navigation chirurgicale peut parfois être difficile dans les grands organes où la structure ciblé se trouve enfouie profondément. De nouvelles méthodes susceptibles d’accroître la réussite de telles interventions médicales suscitent actuellement de l’intérêt chez les professionnels de la santé. La spectroscopie optique, en analysant les interactions lumière-tissu dans une plage spectrale définie, est un outil permettant de différencier les tissus avec une résolution et une sensibilité bien supérieures à celles de l’oeil humain. Tout au long de cette thèse, je détaillerai comment la spectroscopie optique a été utilisée pour créer et améliorer un système de guidage optique utilisé pour la stimulation cérébrale profonde en neurochirurgie, en particulier pour le traitement de la maladie de Parkinson. Pour commencer, je montrerai comment les informations spectroscopiques peuvent fournir une rétroaction peropératoire en temps réel à un neurochirurgien, au cours de la phase d’implantation de la procédure, avec une sonde qui n’induit aucune invasion supplémentaire. Je présenterai l’investigation de deux modalités spectroscopiques différentes pour la discrimination tissulaire pour le guidage, soit la spectroscopie à réflectance diffuse et la spectroscopie de diffusion Raman anti-Stokes cohérente. Les avantages et les inconvénients des deux techniques, ainsi que leurs aptitude à la traduction prometteuse pour cette application seront abordés. Par la suite, je présenterai une nouvelle technique d’analyse de données pour extraire l’oxygénation des tissus à partir de spectres de réflectance diffus dans le but d’améliorer la précision de mesure en spectroscopie rétinienne et ultimement de porter un diagnostique. Bien que conçu pour la rétine, l’algorithme peut également être utilisé pour analyser les spectres acquis lors d’une neurochirurgie afin de fournir des informations à la fois discriminantes et diagnostiques. Finalement, je montrerai des preuves de diffusion anisotrope de la lumière dans les axones myélinisés de la moelle épinière et discuterai des conséquences que cela pourrait avoir sur les simulations actuelles de la propagation des photons dans le cerveau, qui feront partie intégrante d’un guidage optique efficace.
Differentiating tissue types is an important aspect of guiding medical interventions whether it be for disease diagnosis or for surgical guidance. However, diseased and healthy tissues are often hard to discriminate by human vision alone and surgical navigation can be difficult to accomplish in large organs where the target structure lies deep within the body. New methods that can increase certainty in such medical interventions are therefore of great interest to healthcare professionals. Optical spectroscopy is a tool which can be exploited to probe discriminatory information in tissue by analyzing light-tissue interactions with a spectral range, resolution and sensitivity much greater than the human eye. Throughout this thesis, I will explain how I have leveraged optical spectroscopy to create, and improve, an optical guidance system for deep brain stimulation neurosurgery, specifically for the treatment of Parkinson’s disease. I will begin by describing how spectroscopic information can provide real-time feedback to a surgeon during the procedure, in the hopes of ultimately improving treatment outcome. To this end, I will present the investigation of two different spectroscopic modalities for optical guidance: diffuse reflectance spectroscopy, and coherent anti-Stokes Raman scattering spectroscopy. The advantages and disadvantages of both techniques will be discussed along with their promising translatability for this application. Following this, I will present a novel data analysis technique for extracting the tissue oxygenation from diffuse reflectance spectra with the aim of improved diagnostic information in retinal spectroscopy. While designed for the retina, the algorithm can also be used to analyze spectra acquired during a neurosurgery to provide both discriminatory and diagnostic information. Lastly, I will show evidence of anisotropic light scattering in the myelinated axons of the spinal cord and discuss the implications this may have on current photon propagation simulations in the brain, which will be integral for effective optical guidance.
Differentiating tissue types is an important aspect of guiding medical interventions whether it be for disease diagnosis or for surgical guidance. However, diseased and healthy tissues are often hard to discriminate by human vision alone and surgical navigation can be difficult to accomplish in large organs where the target structure lies deep within the body. New methods that can increase certainty in such medical interventions are therefore of great interest to healthcare professionals. Optical spectroscopy is a tool which can be exploited to probe discriminatory information in tissue by analyzing light-tissue interactions with a spectral range, resolution and sensitivity much greater than the human eye. Throughout this thesis, I will explain how I have leveraged optical spectroscopy to create, and improve, an optical guidance system for deep brain stimulation neurosurgery, specifically for the treatment of Parkinson’s disease. I will begin by describing how spectroscopic information can provide real-time feedback to a surgeon during the procedure, in the hopes of ultimately improving treatment outcome. To this end, I will present the investigation of two different spectroscopic modalities for optical guidance: diffuse reflectance spectroscopy, and coherent anti-Stokes Raman scattering spectroscopy. The advantages and disadvantages of both techniques will be discussed along with their promising translatability for this application. Following this, I will present a novel data analysis technique for extracting the tissue oxygenation from diffuse reflectance spectra with the aim of improved diagnostic information in retinal spectroscopy. While designed for the retina, the algorithm can also be used to analyze spectra acquired during a neurosurgery to provide both discriminatory and diagnostic information. Lastly, I will show evidence of anisotropic light scattering in the myelinated axons of the spinal cord and discuss the implications this may have on current photon propagation simulations in the brain, which will be integral for effective optical guidance.
Sobajima, Masaaki. "Effects of Optical Geometry and Optical Guiding on Evolution of Free Electron Lasers". Kyoto University, 1999. http://hdl.handle.net/2433/181682.
Texto completoNijhof, Jeroen Henricus Bernardus. "Propagation of ultrashort pulses in nonlinear optical guiding structures". Groningen : [Groningen] : Stichting Drukkerij C. Regenboog ; [University Library Groningen] [Host], 1996. http://irs.ub.rug.nl/ppn/153294884.
Texto completoLivesey, John Gregor. "Atom guiding in free-space light beams and photonic crystal fibres". Thesis, St Andrews, 2007. http://hdl.handle.net/10023/356.
Texto completoGreenwell, Andrew. "RIGOROUS ANALYSIS OF WAVE GUIDING AND DIFFRACTIVE INTEGRATED OPTICAL STRUCTURES". Doctoral diss., University of Central Florida, 2007. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4346.
Texto completoPh.D.
Optics and Photonics
Optics and Photonics
Optics PhD
Kurth, Martin L. "Plasmonic nanofocusing and guiding structures for nano-optical sensor technology". Thesis, Queensland University of Technology, 2018. https://eprints.qut.edu.au/118670/1/Martin_Kurth_Thesis.pdf.
Texto completoForesi, James S. (James Serge). "Optical confinement and light guiding in high dielectric contrast materials systems". Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10381.
Texto completoBeard, Paul Christopher. "Pulsed laser generation and optical fibre detection of thermoelastic waves in arterial tissue". Thesis, University College London (University of London), 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243986.
Texto completoRay, Taylor J. "Analysis of Side-Polished Few-Mode Optical Fiber". Thesis, Virginia Tech, 2019. http://hdl.handle.net/10919/89761.
Texto completoM.S.
Fiber optic devices have seen significant advancement since the realization of the laser and low-loss optical fiber. Modern day fiber optics are commonly utilized for high-bandwidth communications and specialized sensing applications. Utilizing multiple modes, or wave distributions, in a fiber provides significant advantages towards increasing bandwidth for communications and provides potential for more accurate sensing techniques. Significant research has been conducted in both the sensing and communication field, but mode-domain devices have the capability to significantly advance the field of fiber optic devices. This thesis demonstrates the potential for side-polished fiber geometry to effect each mode independently, thus allowing side-polished fiber to be utilized for realizing novel devices such as multiplexing devices and fiber optic sensors.
Rhodes, Daniel Paul. "Experimental studies of cold atom guiding using hollow light beams". Thesis, University of St Andrews, 2005. http://hdl.handle.net/10023/12932.
Texto completoGütlich, Björn. "Control of nonlinear optical structures from the guiding of dissipative solitons to spatio-temporal synchronisation". Göttingen Cuvillier, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016214833&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.
Texto completoBadolo, Mathieu. "Theoretical study of modal dispersion characteristics in weakly guiding optical fibers and its application to color domain wall propagation". Doctoral thesis, Universite Libre de Bruxelles, 1996. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/212415.
Texto completoPinilla, Pachon Edwin German 1981. "Guiamento óptico de átomos através de feixes não difrativos do tipo "Frozen Waves" = Atom optical guiding along non-diffracting beams of type "Frozen Waves"". [s.n.], 2016. http://repositorio.unicamp.br/jspui/handle/REPOSIP/330786.
Texto completoTese (doutorado) - Universidade Estadual de Campinas, Instituto de Física Gleb Wataghin
Made available in DSpace on 2018-09-01T02:33:12Z (GMT). No. of bitstreams: 1 Pachon_EdwinGermanPinilla_D.pdf: 4993091 bytes, checksum: 788c9fb47dfe7b9fea6cc0935ad94d54 (MD5) Previous issue date: 2016
Resumo: Nesta tese, propõe-se um novo método para realizar guiamento de átomos neutros resfriados. Este método envolve o uso da pressão de radiação por ressonância para efetuar o guiamento dos átomos através de um campo óptico (feixe) oco. Particularmente, usa-se a força de dipolo óptico e um tipo específico de campo óptico não difrativo, chamado de "Frozen Wave" (FW), na versão tradicional e estendida, para estudar o guiamento atômico. Os campos ópticos FW¿s, que são uma solução exata da equação de onda, surgem como uma resposta aos problemas relacionados com a difração e com a impossibilidade de fazer qualquer tipo de modelamento (ou localização) longitudinal e transversal de intensidade, dos campos ópticos tradicionais usados no guiamento de átomos, como por exemplo, nos campos Laguerre-Gauss e Bessel. Assim, planejam-se algumas soluções mediante os métodos tradicional e estendido que permitem criar estruturas de luz (localizadas) resistentes à difração e nas quais o padrão de intensidade longitudinal e transversal (restringido) pode ser modelado a priori. De acordo com isso, o estudo teórico do método tradicional e da generalização das FW¿s foi realizado junto com sua comprovação experimental e foram calculados os respectivos potenciais de dipolo óptico junto com a profundidade de penetração dos átomos na barreira de potencial para cada campo óptico. Nos resultados conseguiu-se modelar algumas estruturas de luz (tanto no método tradicional como no estendido) tais como um cilindro, três cilindros concatenados, um tipo de cilindro com tampa e um funil óptico, entre outras; e mostrou-se as vantagens do uso deste tipo de estruturas de luz quando comparadas com os campos ópticos tradicionais para o guiamento atômico. Finalmente, concluiu-se que usar este tipo de campos não difrativos elimina as restrições dos campos tradicionais e é possível fazer o guiamento de átomos neutros resfriados com estes tipos de estruturas de luz. O método estendido dá uma generalização que permite pensar estes tipos de estruturas de luz para aplicações mais globais nas diferentes áreas da óptica e fotônica
Abstract: This thesis proposes a new method to perform cold neutral atom guiding. This method involves the use of resonance radiation pressure to make the atom guiding along a hollow (beam) optical field. Particularly, it uses the optical dipole force and a specific type of non-diffracting optical field, called "Frozen Wave" (FW), in these traditional and extended versions, to study the atom guiding. The FW¿s optical fields, which are an exact solution of the wave equation, appear as an answer to the problems related to the high diffraction and impossibility of any type of longitudinal and transverse intensity modeling (or location) of traditional optical fields used in atom guiding, for example the Laguerre-Gaussian and Bessel optical fields. Thus, some solutions were planned by the traditional and extended methods, which allow to create localized light structures resistant to diffraction and model a priori longitudinal and transverse (restricted) intensity pattern. Accordingly, the theoretical study of the traditional method and his generalization were carried out with their experimental evidence. Also, his respective optical dipole potential was calculated with the atom penetration depth in the potential barrier for each optical field. In the results was possible to model some light structures (both in the traditional and extended method) such as a cylinder, three concatenated cylinders, one cylinder with a lid and an optical funnel, among others; and it is showed the advantages of using this type of light structures when it is compared with the conventional optical fields for the atom guiding. Finally, it is concluded that use this type of non-diffracting fields eliminates the restrictions of the traditional fields and it is possible the cold neutral atoms guiding with this type of light structures. The FW¿s extended method gives a generalization and it permits to suggest this type of light structures for more complete applications in different areas of optics and photonics
Doutorado
Física
Doutor em Ciências
141977/2013-2
CNPQ
Menotti, Enrico. "Time-dependent and three-dimensional phenomena in free-electron laser amplifiers within the integral-equation approach". Doctoral thesis, Università degli studi di Trieste, 2011. http://hdl.handle.net/10077/4485.
Texto completoHebecker, Dustin. "Development of a single photon detector using wavelength-shifting and light-guiding technology". Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/23231.
Texto completoThe IceCube Neutrino Observatory is an in ice neutrino detector located at the geographic South Pole. In IceCube neutrinos are detected via Cherenkov light produced by secondary particles in neutrino interactions. For the upgraded detector IceCube-Gen2, new and improved light detectors are sought-after. This work describes the development of one of those light detectors based on a novel combination of wavelength-shifting and light-guiding technology. The detector named the Wavelength-shifting Optical Module (WOM) utilizes a large transparent tube, coated with wavelength-shifting paint as a passive photon detector. The wavelength-shifted light is guided via total internal reflection towards small active light detectors, at each end of the tube. This design reduces costs and improves the signal to noise ratio significantly, thereby potentially enabling extragalactic supernova detections in future detectors. As a core component, the wavelength-shifting tube is extensively investigated. Different measurement setups and evaluation techniques are developed and investigated. Iterative improvement of materials and coating techniques as well as measurement methods currently result in a combined photon capture, shift and transport efficiency of 28.1 +/- 5.4 % for the tube. Those results contrast the theoretical maximum of 74.5 %. A model is developed to describe the light propagation and loss processes in the tube and to understand the discrepancies between theory and measurement. The combination of the measurements with the model, validate the descriptive qualities of the model and show that most of the light is lost during the light propagation in the tube. Additionally, the physical properties of the WOM are included in the IceCube simulation framework. A comparison to a competing module showed that the WOM outperforms by a factor of 1.05 +/- 0.07 in photon detection numbers. Where applicable, suggestions and outlooks are given to enhance the performance of the WOM.
Gherardi, David Mark. "Studies of particle and atom manipulation using free space light beams and photonic crystal fibres". Thesis, St Andrews, 2009. http://hdl.handle.net/10023/703.
Texto completoTchomgo, Felenou Emmanuel. "Cartographie unifiée de la dynamique des solitons dans les guides d'onde à fibre optique". Phd thesis, Université de Bourgogne, 2013. http://tel.archives-ouvertes.fr/tel-00945451.
Texto completoARMAROLI, Andrea. "Modelling and Characterization of Guiding Micro-structured Devices for Integrated Optics". Doctoral thesis, Università degli studi di Ferrara, 2008. http://hdl.handle.net/11392/2389240.
Texto completoAlamein, Mohammad A. "Guiding Stem Cells for Tissue and Organ Engineering: Clinical Grade Nanofiber Electrospinning for Recreation of the Optimal 3-Dimensional Extracellular Niche to Control Cellular Fate". Thesis, Griffith University, 2014. http://hdl.handle.net/10072/367480.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Dentistry and Oral Health
Griffith Health
Full Text
Greenup, Phillip John. "Development of Novel Technologies for Improved Natural Illumination of High Rise Office Buildings". Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/15936/1/Philip_Greenup_Thesis.pdf.
Texto completoGreenup, Phillip John. "Development of Novel Technologies for Improved Natural Illumination of High Rise Office Buildings". Queensland University of Technology, 2004. http://eprints.qut.edu.au/15936/.
Texto completoKomati, Bilal. "Automated microassembly using an active microgripper with sensorized end-effectors and hybrid force / position control". Thesis, Besançon, 2014. http://www.theses.fr/2014BESA2066/document.
Texto completoThis work proposes the use of an active microgripper with sensorized end-effectors for the automationof the microassembly of 3D hybrid MOEMS. Each of the two fingers of the microgripper is composedof a piezoelectric actuator with an integrated piezoresistive force sensor. The integrated force sensorpresents innovative performances compared to the existing force sensors in literature. The forcesensors provide the ability to measure the gripping forces applied by the microgripper to grasp a microcomponentand estimated the contact forces between the microcomponent and the substrate ofmicroassembly. A dynamic nonlinear model of the microgripper is developed. A hybrid force/positioncontrol is used for the automation of the microassembly. In the hybrid force/position control formulation,some axes are controlled in position and others are controlled in force. For the force controlledaxes, a new nonlinear force control scheme based on force tracking sliding mode impedance controlis proposed with parameter estimation. Using the proposed hybrid force/position control scheme, fullautomation of the microassembly is performed, notably for the guiding of a flexible component in arail
Anugu, Narsireddy. "Beam characterization and guiding for optical/infrared interferometry". Doctoral thesis, 2017. https://repositorio-aberto.up.pt/handle/10216/110425.
Texto completoAnugu, Narsireddy. "Beam characterization and guiding for optical/infrared interferometry". Tese, 2017. https://repositorio-aberto.up.pt/handle/10216/110425.
Texto completoTien, Chung-Hao y 田仲豪. "Light Guiding and Micro-Optical components for High Density OPtical Storage Applications". Thesis, 2003. http://ndltd.ncl.edu.tw/handle/35095588436879451970.
Texto completo國立交通大學
光電工程所
91
Optical data storage industries are continually growing with rapid progress of computer, multimedia, and network markets. In this trend, technologies capable of recording more information thus become increasingly demanded. Since optical heads are a key component of the recording system, developing a high-spatial-resolution, high-optical-efficiency and small-sized optical head is thus essential to enable the system more competitive in price and performance. For increasing the recording density, a near-field optical approach using a solid immersion lens (SIL) was developed. The effective numerical aperture (NAEFF) of the system can be achieved above theoretical upper limit of 1.0 in air. The air spacing between the SIL and the recording medium is an important factor that influences the focused spot quality. Compared with gap width h = 0 nm, the spot width is increased by 90 % at h = 300 nm. The primary factor causing increased spot size at larger air spacing is due to the gap-induced aberration, which is introduced by the phase and amplitude apodization when the incident light passes through the air gap. On the other hand, the peak intensity of the focused beam is decreased by 85 % when the gap width h changes from 0 to 300 nm. The reflection coefficients of the thin-film structure are both angle and polarization dependent, the contrast of readout signal is a different function of air gap width for x and y polarizations. For an x-polarized incident beam, the simulation shows that a method by filtering y-polarized light results in a factor 1.0 to 1.35 higher than non-polarized detection for signal contrast in phase-change media. We then demonstrated a microfabrication of SIL array by using a 248 nm excimer laser micromachining with a gray-tone mask photolithography. With pre-correlation to the nonlinear exposure process, a 30-mm-radius hemispherical SIL array was achieved with a deviation of less than 5%. The fabricated SIL array was used with a 0.54 NA objective to achieve 0.87 effective NA measured by the knife-edge scanning. In order to make the optical head smaller and lighter for fast access, we designed and fabricated a hyperbolic-shaped microlens on a single-mode fiber (SMF) to achieve the focused spot 1/e2 = 0.82 mm (x-direction) and 0.89 mm (y-direction) at 145 mm working distance by the discharged arc method. To overcome the drawbacks of low NA and fragility of the fiberlens-type optical head, a well-controlled mechanical structure with a fiberlens, a SIL and a submicron aperture was proposed as a heat source for near-field recording. Through this structure, a below-diffraction-limited submicron aperture (600 nm) within the diffraction-limited fiberlens illumination was used to realize a super small spot size with 10-1 throughput efficiency. This small-size (3mm*3mm*500mm) highly integrated module can be driven by a radial actuator for beam steering, which can potentially function as a flying head in next-generation optical storage systems.
Eckerskorn, Niko Oliver. "Trapping and guiding microscopic particles with light-induced forces". Phd thesis, 2016. http://hdl.handle.net/1885/110786.
Texto completoJiang, Ching-Jing y 江慶京. "Design and Implementation of Optical-Flow-Based Guiding Robot". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/72709545567015799621.
Texto completo淡江大學
電機工程學系碩士班
98
In this thesis, an optical-flow based tracking system is implemented. With the optical-flow perturbation detect algorithm, the robot can follow the hand waving in scene, and reach the goal of visual following. The system architecture in this thesis is based on linux system, and use OpenCV library to implement optical-flow perturbation detect algorithm. There are 4 steps of optical-flow perturbation detection: (1) Get difference between two frames, (2) Remove background noise, (3) Calculate the sum of perturbation energy, (4) Gather the Region Of Interest (ROI) from image. For design and implement action, this thesis designs a robot to move in constant speed, improve the result of optical-flow algorithm to detect the waving hand, and implement a Proportional and Integral Controller by Verilog HDL on FPGA to control the motor. From the experiment result, the method of this thesis can lead the robot to follow the waving hand, reach the goal of optical-flow tracking.
Dall, Robert Grant. "Optical guiding with bright sources of cold 2[superscript 3]S[subscript 1] metastable helium". Phd thesis, 2004. http://hdl.handle.net/1885/150312.
Texto completoTsai, Yi-Chen y 蔡一辰. "Optical Analysis and Printing Process of Ultra-thin LED Backlight Guiding Plates". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/60700994238085033703.
Texto completo國立中興大學
材料科學與工程學系所
98
Abstract The current trend of TFT displays is towards energy efficiency and carbon reduction and the light-emitting diodes (LEDs) have been utilized as the emitter in the backlight module. In this period, the LED replaces the CCFL light source gradually and it performs better optical performance obviously as a result of creating the module thinner. Currently, the ultra-thin light guiding plates are manufactured by the ejection molding method. However, the ejection molding can only be applied for small-size light guiding plates. It is well known that the LED backlight modules are moving in large size. Therefore, the screen printing becomes a dominant technique in future large-size light guiding plates. This thesis focuses on the design of LED backlight module of the 24” light guiding plates. The parameters of the screen printing process for the light guiding plate are also investigated. The improvement and optimization of the optical pattern and printing process were confirmed to be the critical issues when the thickness of the light guiding plate is decreased. For the middle and larger light guiding plates, the major manufacture issue is lack of shelter, which will result in the dot size decreasing in the design stage. Nowadays, the solvent ink with polyester screen only have 30 percent yield rate in the conventional screen printing process. It was found that the combination of UV ink printing with steel silk screen have achieved the yield rate of over 95% in the printing process. As a result, this process can not only accelerate the commercialization of the large-size ultra-thin light guiding plate import, but also improve the performance of light guiding plates with efficient cost reduction margin.
Pan, Po-Hsuan y 潘柏軒. "Using Stepped Structure to Design the Optical Coupler for Natural Light Guiding System". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/78987635109774396257.
Texto completo國立臺灣科技大學
電子工程系
98
For saving energy and healthy lighting, many researches focus on the sunlight illumination system. A Natural Light Guiding System can be separated into collecting, transmission, and lighting parts. With a cascadable concentrator in the collecting part, the transmission part will use large number of lightpipe. It means the most of cost is on the transmission part. The role of the optical coupler has become more and more important for Nature light guiding system. With the useful design, one can get the better efficiency. The purpose of this paper is to report the research of optical coupler. We present a concept that combines stepped structure with light pipe. In this paper, we utilize the stepped structure optical coupler. It was found that the stepped structure can maintain the output angle successfully. In conclusion, the features of stepped structure optical coupler make the coupler system easier to couple and maintain the output angle.
Xiao, Jian-Long y 蕭建隆. "Guiding the movements and patterning the culture of adherent cells by optical micropatterns". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/89952002087340452443.
Texto completo國立陽明大學
生醫光電研究所
100
The first part of this thesis is to develop a method which can fine induce the spontaneous movement of cells. This study is based on the research of guiding the neural growth by using the infrared laser light. We illuminate the lamellipodia of cells by using 405 nm and 1064 nm laser light then observe the movement of lamellipodia. In the result, the 405 nm and 1064 nm laser light induce cell lamellipodia retraction and protrusion respectively. The most effective parameters of 405 nm laser light to induce lamellipodia retraction are 0.1 mW of power and 100 msec of illumination duration. On the other hand, the most effective parameters of 1064 nm laser light to induce lamellipodia protrusion are 4 mW of power and 10 sec of illumination duration. We also calculate the increment of local temperature in DMEM culture medium around the 405 nm and 1064 nm laser light. The results are = 5×10-7 oC and = 2×10-2 oC so the increment of local temperature is negligible. We find that the 405 nm laser light reduces the actin distribution near the illuminated site, while the 1064 nm light increases the density of actin. In the second part of this thesis, we improve the system which was projected the 473 nm optical micropattern with 0.4 W/cm2 of power on the bottom of culture dish. The optical pattern will generate the light fence to culture and confine the region of cell growth. The lung cancer cells can migration and proliferation as normal cultured cells inside a 50 um width of triangle light fence but can not migrate to the outside of the light fence. The cells inside the light fence form a complete triangle colony after a few days. In order to confirm the correlation between the pattern of cell colony and light fence, we create a 50 um width of rectangle light fence on the bottom of culture dish. The cells inside the light fence form a complete rectangle colony after a few days. The results are similar to the experiment of the triangle light fence. We change the cell line with A549 and demonstrate that the micropattern culture is cell line independent. After the data analysis and quantification, the discrepancy between the pattern of cell colony and light fence is about 15 %. It means that the pattern of cell colony has a great resemblance to the light fence. Furthermore, the effect of cell viability affected by light fence is very small. We perform a complete process of the wound healing by using the dynamic light fence. The wound healing is appropriate for demonstrate the controlled ability of the light fence in the spatial and temporal domains. A complete process of the wound healing includes the three parts. First is to generate two independent cell colonies by using light fence (0-24 hr). Second is to maintain the micropattern of two independent cell colonies (24-48 hr). Finally is to carry out the wound healing (48-96 hr). It also manifests that the system can maintain and control the micropattern of the adhere cells in a long-term experiment. We also estimate the effect of the local risen temperature of DMEM culture medium around the 473 nm light fence at 0.4 W/cm2. The result shows that the local risen temperature is 4×10-6 ºC. Therefore we exclude the effect of the local risen temperature from the mechanism which affects the cell behaviors. On the other hand, we observe that the intercellular mitochondria were damaged by the 473 nm light fence. We surmise that 473 nm light fence destroy the mitochondria may be the mechanism of the micropattern culture of adhere cells by using light fences. In future works of this thesis, there are three parts of the applied studies. The first part is using the light fence to study the cell dynamics, cell behaviors and cell-cell interaction. The second part is combining the light fence and biochip which generates the electric field or delivers the drugs. We aspire to develop a technique which can perform multi-stimulation on the cells.
Shuo-JeHsieh y 謝碩哲. "Optical Devices for Collimating and Guiding Edge-Emitting Laser Diodes Via Multiphoton Microfabrication". Thesis, 2018. http://ndltd.ncl.edu.tw/handle/7zq5w9.
Texto completo國立成功大學
工程科學系
107
As of currently, many optical application in microstructures are being made via multiphoton excitation (MPE) attached on semiconductors. However, there is a lack of research regarding direct fabrication on semiconductor lasers with combination of optical structures that consists of both the abilities to guide and collimate the laser beam. In this thesis, MPE technique is utilized to create three dimensional (3D) structures via polymerization in trimethylolpropane triacrylate (TMPTA) solution. Due to the fact that the precision of MPE is in focal volume, the sectioning effect is significantly better than single-photon excitation. With this technique, the high spatial resolution of the 3D waveguide devices has the ability to collimate and redirect laser beam can be directly fabricated on specific location of laser diodes. The main mechanism of the multiphoton-induced fabrication technique was done in TMPTA solutions, the solution contains TMPTA as the reactive monomer, rose Bengal (RB) as the photoactivator, and trimethylamine (TEA) as co-initiator. In this process, the photoactivator is activated through two-photon absorption (TPA) of femtosecond laser to produce the two-photon polymerization (TPP). In addition, femtosecond laser can generate enough photon energy density within focal volume. Hence, the free radicals are produced from the reaction and the energy is then transferred to the monomers. After having the energy transferred, the TMPTA monomers attach with each other through covalent bonding and form a precise, delicate, transparent and rigid structure on selected area in micron-scale that standard fabrication methods could find difficult to work with. The objective of this thesis is to use TPP to fabricate a combination of photonics devices directly on edge-emitting laser diode (EEL). Through guiding the laser in the direction similar to vertical-cavity surface-emitting laser diode (VCSEL) then collimate the divergent laser beam by a lens. VCSEL is the trend of laser diode technology since it is economical to manufacture, easier to couple with optical fiber. And the circular-like laser beam from VCSEL can be collimated more efficiently. However, due to the fact that VCSEL has a short cavity, it is difficult to generate higher power output. On the other hand, EEL have long cavity to generate stronger laser. By attaching the optical devices to EEL, this semiconductor laser will then be able to have much greater value of power output and the direction is relatively close to VCSEL for better versatility and flexibility in potential electric device applications. In conclusion, this thesis has concluded that it is possible to have direct fabrication through MPE to construct optical devices on specific location on a semiconductor laser with designate functions and properties. Though there are some defects exist, it could be improved with adjustment on design and process, and the future potential continues.
Chen, Bo-Yan y 陳柏諺. "Study of optical guiding effect of GaN-based vertical-cavity surface-emitting lasers". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/jvmd42.
Texto completo國立交通大學
光電工程研究所
108
In recent years, GaN-based devices have attracted considerable attentions by researchers from academia and industry, which can be applied in optical communications, optical storage, solid state lightning and so on. Futhermore, GaN-based VCSEL even playing an important role in 3D sensing and LiDAR. In this paper, we design the GaN-based VCSEL with optical guiding structure by modulating compensation layer thickness to prevent the anti-guiding effect. In process, laser lift-off, wafer bonding and CMP techniques were adopted in order to fabricate dielectric type of vertical-cavity surface-emitting lasers with optical guiding and anti-guiding structure. Also,we optimize the measurement to control cavity length precisely during CMP. We demonstrate the anti-guiding GaN-based VCSEL with different aperture, which shows the smaller aperture, the anti-guiding effect more obvious. And the threshold current density decreases with the distance between the cavity mode and gain peak. On the other hand, we also demonstrate the optical guiding GaN-based VCSEL, shows the lower threshold current density 25.4 kA/cm2. In a future study, we will investigate the better optical guiding structure, in order to make the threshold current density lower.
Chou, Kao-Hsu y 周高旭. "An Optical Switch of Natural Light Guiding System Based on Cubic Structure with Fresnel Surface". Thesis, 2010. http://ndltd.ncl.edu.tw/handle/87271138008837104096.
Texto completo國立臺灣科技大學
電子工程系
98
Recently, many researches focus on the sunlight illumination to provide for indoor lighting and saving energy which is called Nature Light Guiding System. For indoor lighting, it can provide the same brightness as the tradition lamp and it can also save 80% energy with the lamp. In order to use the sunlight effectively, we design an optical to control and change the direction of the transmitted light. For the past optical switch, the efficiency is unable to achieve the desired result. To solve this problem, we use two lenses to redesign an optical switch and the parameters are calculated by the Q-U method.
Guo, Chia-Yu y 郭佳瑜. "The Sun Guiding System– Optical Simulation for Emission Element of Lens Applied in the Commercial Lighting". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/66637710329923375758.
Texto completo中華科技大學
機電光工程研究所碩士班
101
Recently, all people emphasize the environmental friendly concepts. The green industry is fast developing. More and more company are taking plunge in all kinds of green products to sell. Among these products, the so-called Sun Guiding System is one of the most environmental and cleanest part worth for us to exploit. If we are able to guide natural light from outside to inside to illuminate our indoor spaces, we can say good bye to electricity, save energy, and save money from our pockets. The Sun Guiding System is composed of the modules, namely, sun collection, transmission, and emission. This paper is focused on the emission module that includes a TIR lens specially designed for optical- fiber to connect and emit natural light for commercial lighting by the tool of optical simulation software. Hopefully through the above simulation and study, an appropriate optical device – lens for optical-fiber can be designed to adjust the illuminance, to prevent glare, or to adjust the light angles, and then apply to different business stores, such as coffee shop, cloth shops or even bookstores.
Ferretti, Stefano. "Virtual micro-reality: immersive manipulation of live microscopic systems". Doctoral thesis, 2021. http://hdl.handle.net/11573/1562690.
Texto completoPrasad, Tushar. "Superprism phenomenon in photonic crystals: Guiding the path of light". Thesis, 2004. http://hdl.handle.net/1911/17721.
Texto completoHutomo, Merciawati y Merciawati Hutomo. "Multi-Objective Dynamic Guiding Chaotic Search Particle Swarm Optimization (MO-DCPSO) for Optimal Labor Shifts Utilization". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/63423048194540817641.
Texto completo國立臺灣科技大學
營建工程系
101
Multiple labor shifts system is commonly used in construction project to achieve the desired deadline. However, evening and night shifts may bring negative impacts and the application must be as low as possible. In this study, a new multi-objective optimization algorithm has been proposed and applied to solve multiple labor shifts problem. The proposed approach, MO-DCPSO, presents a new multi-objective optimization algorithm based on DCPSO which hybridizing dynamic guiding and chaotic search concepts with PSO. The multiple labor shifts problem has three objectives to minimize: project duration, project cost and total labor hours in evening and night shifts, while also maintaining all scheduling constraints, such as job logic and daily resource limit. An application example is used to illustrate the performance of the proposed approach. This study also builds NSGA-II and MOPSO model for comparison methods. The obtained Pareto front may provide solutions for construction practitioners to facilitate the decision making for construction trade-off problems.
Chen, Yan-Ting y 陳彥廷. "Optimal Configuration Design and Development of a Design Guiding System for a Dual-Toggle-Type Micro Machine Tool". Thesis, 2011. http://ndltd.ncl.edu.tw/handle/a2x3ym.
Texto completo中原大學
機械工程研究所
99
Due the manufacturing demand of miniature parts, Non-MENS micro manufacturing has become one of the important developing manufacturing technologies. A micro machine tool with characteristics of low cost and high performance plays an important role in the micro machining field. In this study, a new configuration design for the dual-toggle-type micro machine tools was proposed. The new design improves the drawbacks of the previous design made by our lab. After optimization process, the design provides the advantages of small floor space, long travel length, and small variations in feed resolution. Besides, to shorten the design time, this research also developed a design guiding system written in MATLAB. This system can guide a user to complete the design of the important component of a new dual-toggle-type machine tool based on the defined floor space or travel length. In addition, the volumetric error analysis function and the error sensitivity analysis function were also built in the system to provide users the reference for selection of optimal machining region or continuous design improvement of the machine.
Manning, Andrew Geoffrey. "Foundation experiments in quantum atom optics with ultracold metastable helium". Phd thesis, 2014. http://hdl.handle.net/1885/12368.
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