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Littérature scientifique sur le sujet « Tapered Fibre »

Auteur : Grafiati
Publié le 9 mars 2023
Mis à jour le 10 mars 2023

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Articles de revues sur le sujet "Tapered Fibre"

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Korposh, Sergiy, Stephen James, Seung-Woo Lee et Ralph Tatam. « Tapered Optical Fibre Sensors : Current Trends and Future Perspectives ». Sensors 19, no 10 (17 mai 2019) : 2294. http://dx.doi.org/10.3390/s19102294.

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The development of reliable, affordable and efficient sensors is a key step in providing tools for efficient monitoring of critical environmental parameters. This review focuses on the use of tapered optical fibres as an environmental sensing platform. Tapered fibres allow access to the evanescent wave of the propagating mode, which can be exploited to facilitate chemical sensing by spectroscopic evaluation of the medium surrounding the optical fibre, by measurement of the refractive index of the medium, or by coupling to other waveguides formed of chemically sensitive materials. In addition, the reduced diameter of the tapered section of the optical fibre can offer benefits when measuring physical parameters such as strain and temperature. A review of the basic sensing platforms implemented using tapered optical fibres and their application for development of fibre-optic physical, chemical and bio-sensors is presented.
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Moś, Joanna Ewa, Karol Antoni Stasiewicz et Leszek Roman Jaroszewicz. « Liquid crystal cell with a tapered optical fiber as an active element to optical applications ». Photonics Letters of Poland 11, no 1 (3 avril 2019) : 13. http://dx.doi.org/10.4302/plp.v11i1.879.

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The work describes the technology of a liquid crystal cell with a tapered optical fiber as an element providing light. The tapered optical fiber with the total optical loss of 0.22 ± 0.07 dB, the taper waist diameter of 15.5 ± 0.5 μm, and the elongation of 20.4 ± 0.3 mm has been used. The experimental results are presented for a liquid crystal cell filled with a mixture 1550* for parallel orientation of LC molecules to the cross section of the taper waist. Measurement results show the influence of the electrical field with voltage in the range of 0-200 V, without, as well as with different modulation for spectral characteristics. The sinusoidal and square signal shapes are used with a 1-10 Hz frequency range. Full Text: PDF ReferencesZ. Liu, H. Y. Tam, L. Htein, M. L.Vincent Tse, C. Lu, "Microstructured Optical Fiber Sensors", J. Lightwave Technol. 35, 16 (2017). CrossRef T. R. Wolinski, K. Szaniawska, S. Ertman1, P. Lesiak, A. W. Domański, R. Dabrowski, E. Nowinowski-Kruszelnicki, J. Wojcik "Influence of temperature and electrical fields on propagation properties of photonic liquid-crystal fibres", Meas. Sci. Technol. 17, 5 (2006). CrossRef K. Nielsen, D. Noordegraaf, T. Sørensen, A. Bjarklev,T. Hansen, "Selective filling of photonic crystal fibres", J. Opt. A: Pure Appl. Opt. 7, 8 (2005). CrossRef A. A. Rifat, G. A. Mahdiraji, D. M. Chow, Y, Gang Shee, R. Ahmed, F. Rafiq, M Adikan, "Photonic Crystal Fiber-Based Surface Plasmon Resonance Sensor with Selective Analyte Channels and Graphene-Silver Deposited Core", Sensors 15, 5 (2015) CrossRef Y. Huang, Z.Tian, L.P. Sun, D. Sun, J.Li, Y.Ran, B.-O. Guan "High-sensitivity DNA biosensor based on optical fiber taper interferometer coated with conjugated polymer tentacle", Opt. Express 23, 21 (2015). CrossRef X. Wang, O. S. Wolfbeis, "The 2016 Annual Review Issue", Anal. Chem., 88, 1 (2016). CrossRef Ye Tian, W. Wang, N. Wu, X. Zou, X.Wang, "Tapered Optical Fiber Sensor for Label-Free Detection of Biomolecules", Sensors 11, 4 (2011). CrossRef O. Katsunari, Fundamentals of Optical Waveguides, (London, Academic Press, (2006). DirectLink A. K. Sharma, J. Rajan, B.D. Gupta, "Fiber-Optic Sensors Based on Surface Plasmon Resonance: A Comprehensive Review", IEEE Sensors Journal 7, 8 (2007). CrossRef C. Caucheteur, T. Guo, J. Albert, "Review of plasmonic fiber optic biochemical sensors: improving the limit of detection", Anal. Bioanal.Chem. 407, 14 (2015). CrossRef S. F. Silva L. Coelho, O. Frazão, J. L. Santos, F. X.r Malcata, "A Review of Palladium-Based Fiber-Optic Sensors for Molecular Hydrogen Detection", IEEE SENSORS JOURNAL 12, 1 (2012). CrossRef H. Waechter, J. Litman, A. H. Cheung, J. A. Barnes, H.P. Loock, "Chemical Sensing Using Fiber Cavity Ring-Down Spectroscopy", Sensors 10, 3 (2010). CrossRef S. Zhu, F. Pang, S. Huang, F.Zou, Y.Dong, T.Wang, "High sensitivity refractive index sensor based on adiabatic tapered optical fiber deposited with nanofilm by ALD", Opt. Express 23, 11 (2015). CrossRef L. Zhang, J. Lou, L. Tong, "Micro/nanofiber optical sensors", Photonics sensor 1, 1 (2011). CrossRef L.Tong, J. Lou, E. Mazur, "Single-mode guiding properties of subwavelength-diameter silica and silicon wire waveguides", Opt. Express 11, 6 (2004). CrossRef H. Moyyed, I. T. Leite, L. Coelho, J. L. Santos, D. Viegas, "Analysis of phase interrogated SPR fiber optic sensors with bimetallic layers", IEEE Sensors Journal 14, 10 (2014). CrossRef A. González-Cano, M. Cruz Navarette, Ó. Esteban, N. Diaz Herrera , "Plasmonic sensors based on doubly-deposited tapered optical fibers", Sensors 14, 3 (2014). CrossRef K. A. Stasiewicz, J.E. Moś, "Threshold temperature optical fibre sensors", Opt. Fiber Technol. 32, (2016). CrossRef L. Zhang, F. Gu, J. Lou, X. Yin, L. Tong, "Fast detection of humidity with a subwavelength-diameter fiber taper coated with gelatin film", Opt. Express 16, 17 (2008). CrossRef S.Zhu, F.Pang, S. Huang, F. Zou, Q. Guo, J. Wen, T. Wang, "High Sensitivity Refractometer Based on TiO2-Coated Adiabatic Tapered Optical Fiber via ALD Technology", Sensors 16, 8 (2016). CrossRef G.Brambilla, "Optical fibre nanowires and microwires: a review", J. Optics 12, 4 (2010) CrossRef M. Ahmad, L.L. Hench, "Effect of taper geometries and launch angle on evanescent wave penetration depth in optical fibers", Biosens. Bioelectron. 20, 7 (2005). CrossRef L.M. Blinov, Electrooptic Effects in Liquid Crystal Materials (New York, Springftianer, 1994). CrossRef L. Scolari, T.T. Alkeskjold, A. Bjarklev, "Tunable Gaussian filter based on tapered liquid crystal photonic bandgap fibre", Electron. Lett. 42, 22 (2006). CrossRef J. Moś, M. Florek, K. Garbat, K.A. Stasiewicz, N. Bennis, L.R. Jaroszewicz, "In-Line Tunable Nematic Liquid Crystal Fiber Optic Device", J. of Lightwave Technol. 36, 4 (2017). CrossRef J. Moś, K A Stasiewicz, K Garbat, P Morawiak, W Piecek, L R Jaroszewicz, "Tapered fiber liquid crystal hybrid broad band device", Phys. Scripta. 93, 12 (2018). CrossRef Ch. Veilleux, J. Lapierre, J. Bures, "Liquid-crystal-clad tapered fibers", Opt. Lett. 11, 11 (1986). CrossRef R. Dąbrowski, K. Garbat, S. Urban, T.R. Woliński, J. Dziaduszek, T. Ogrodnik, A,Siarkowska, "Low-birefringence liquid crystal mixtures for photonic liquid crystal fibres application", Liq. Cryst. 44, (2017). CrossRef S. Lacroix, R. J. Black, Ch. Veilleux, J. Lapierre, "Tapered single-mode fibers: external refractive-index dependence", Appl. Opt., 25, 15 (1986). CrossRef J.F. Henninot, D. Louvergneaux , N.Tabiryan, M. Warenghem, "Controlled Leakage of a Tapered Optical Fiber with Liquid Crystal Cladding", Mol. Cryst.and Liq.Cryst., 282, 1(1996). CrossRef
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Khudyakov, M. M., A. E. Levchenko, V. V. Vel’miskin, K. K. Bobkov, S. S. Aleshkina, M. M. Bubnov, M. V. Yashkov, A. N. Guryanov, L. V. Kotov et M. E. Likhachev. « Optimisation of the efficiency of tapered erbium-doped optical fibre ». Quantum Electronics 51, no 12 (1 décembre 2021) : 1056–60. http://dx.doi.org/10.1070/qel17651.

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Abstract We have developed a cladding pumped tapered erbium-doped fibre with a record-high core diameter for erbium-doped fibres (100 mm) and a near diffraction-limited beam quality (μ 2 ∼ 1.3). Optimisation of the tapered fibre parameters provided a high (18 %) efficiency of pump radiation conversion at a wavelength of 976 nm into signal radiation at a wavelength of 1560 nm.
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Vukovic, Natasha, Neil G. R. Broderick et Francesco Poletti. « Parabolic Pulse Generation Using Tapered Microstructured Optical Fibres ». Advances in Nonlinear Optics 2008 (2008) : 1–10. http://dx.doi.org/10.1155/2008/480362.

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This paper presents a numerical study of parabolic pulse generation in tapered microstructured optical fibres (MOFs). Based on our results and the algorithms presented, one can determine the linear taper profile (starting and finishing pitch values and taper length) needed to achieve parabolic pulse shaping of an initial Gaussian pulse shape with different widths and powers. We quantify the evolution of the parabolic pulse using the misfit parameter and show that it is possible to reach values significantly better than those obtained by a step index fibre.
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Korec, Joanna, Karol Antoni Stasiewicz et Leszek Roman Jaroszewicz. « Temperature effect on the light propagation in a tapered optical fiber with a twisted nematic liquid crystal cladding ». Photonics Letters of Poland 11, no 1 (3 avril 2019) : 16. http://dx.doi.org/10.4302/plp.v11i1.881.

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This paper presents the influence of temperature on optical power spectrum propagated in a tapered optical fiber with twisted nematic liquid crystal cladding (TOF-TNLCC) modulated by an electric field. The measurements were performed for a liquid crystal cell with the twisted orientation of ITO layers, filled with E7 mixture. The induced reorientation of liquid crystal (LC) n-director was measured for visible and near-infrared wavelength range [550-1100 nm] at the electric field range of 0–160 V and temperature range of 20-60 °C. The relation between temperature and the optical power spectrum of the investigated device has been established. Full Text: PDF ReferencesV.J. Tekippe, "Passive fiber optic components made by the fused biconical taper process", Proc. SPIE 1085 (1990). CrossRef T. A. Birks, Y. W. Li, The shape of fiber tapers, Journal of Lightwave Technology 10, 4 (1992). CrossRef J. Korec, K. A. Stasiewicz, O. Strzeżysz, P. Kula, L. R. Jaroszewicz, Electro-Steering Tapered Fiber-Optic Device with Liquid Crystal Cladding, Journal of Sensors 2019: 1-11 (2019) CrossRef Ch. Veilleux, J. Lapierre, J. Bures, Liquid-crystal-clad tapered fibers, Opt. Lett. 11, 733-735 (1986) CrossRef J. F Henninot, D. Louvergneaux, N. Tabiryan, M. Warenghem, Controlled leakage of a tapered optical fiber with liquid crystal cladding, Molecular Crystals and Liquid Crystals, 282, 297-308. (1996). CrossRef Y. Wang, et.al., Tapered optical fiber waveguide coupling to whispering gallery modes of liquid crystal microdroplet for thermal sensing application, Opt. Express 25, 918-926 (2017) CrossRef J. Korec, K. A. Stasiewicz, O. Strzeżysz, P. Kula, L. R. Jaroszewicz, . E. Moś, Tapered fibre liquid crystal optical device, Proc. SPIE 10681 (2018) CrossRef G. Assanto, A. Picardi, R. Barboza, A. Alberucci, Electro-optic steering of Nematicons, Phot. Lett. Poland 4, 1 (2012). CrossRef A.Ghanadzadeh Gilani, M.S. Beevers, The Electro-optical kerr effect in eutectic nematic mixtures of E7 and E8,J ournal of Molecular Liquids, 92, 3 (2001). CrossRef E. C. Mägi, P. Steinvurzel, and B.J. Eggleton, Tapered photonic crystal fibers, Opt. Express 784, 12, 5 (2004). CrossRef Y. Li and J. Lit, Transmission properties of a multimode optical-fiber taper, J. Opt. Soc. Am. A 2, (1985). CrossRef J. Korec, K. A. Stasiewicz, and L. R. Jaroszewicz, Temperature influence on optical power spectrum of the tapered fiber device with a liquid crystal cladding, Proc. SPIE 11045, 110450I (2019) CrossRef L.M. Blinov, Liquid crystals: physical properties and their possibilities in application, Advances in Liquid Crystal Research and Applications, (1981). CrossRef
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Zhang, Wu, Yanxiao Lin, Yusong Gao, Zekai Guo, Xiangling Li, Yuhong Hu, Pengcai Dong, Qifan Zhang, Xiaohui Fang et Meng Zhang. « Numerical and Experimental Investigation on the Optical Manipulation from an Axicon Lensed Fiber ». Micromachines 12, no 2 (12 février 2021) : 187. http://dx.doi.org/10.3390/mi12020187.

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Here we numerically and experimentally studied the optical trapping on a microsphere from an axicon lensed fiber (ALF). The optical force from the fiber with different tapered lengths and by incident light at different wavelengths is calculated. Numerically, the microsphere can be trapped by the fiber with tapered outline y=±x/0.5 and y=±x at a short incident wavelength of 900 nm. While for the fiber with tapered outline y=±x/2, the microsphere can be trapped by the light with longer wavelength of 1100 nm, 1300 nm, or 1500 nm. The optical trapping to a polystyrene microsphere is experimentally demonstrated in a microfluidic channel and the corresponding optical force is derived according to the fluid flow speed. This study can provide a guidance for future tapered fibre design for optical trapping to microspheres.
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Pendock, G., H. S. Mackenzie et F. P. Payne. « Tapered optical fibre dye laser ». Electronics Letters 28, no 2 (1992) : 149. http://dx.doi.org/10.1049/el:19920092.

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Kumar, Rahul. « Magnetic Field Sensing Using Tapered Small-Core Optical Fibre Surrounded by Different Concentrations of Magnetic Fluid ». Sensors 22, no 21 (5 novembre 2022) : 8536. http://dx.doi.org/10.3390/s22218536.

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In this paper, a high-sensitivity magnetic field sensor based on a single-mode–tapered small-core–single-mode (STSCS) optical fibre structure is investigated. The tapered small-core section of STSCS is surrounded by magnetic fluid (MF) containing ferromagnetic particles (FMPs) of different concentrations. The FMPs align themselves along the magnetic field, depending on the strength of the magnetic field. This alignment of FMPs changes the refractive index around the tapered small-core section, which in turn changes the output spectral response of the STSCS optical fibre structure. The change in spectral response is then calibrated for sensing the magnetic field strength. This paper also investigates the effect of both the taper waist diameter of the STSCS optical fibre structure and the concentration of MF surrounding it on the magnetic field sensitivity. The maximum sensitivity demonstrated in this paper is 0.46 nm/mT for a taper waist diameter of 10 μm surrounded by 1.22% FMPs in the MF. The magnetic sensor demonstrates reversible results, and its effects on the orientation of the magnetic field along the X–Y, X–Z and Y–Z axes are also investigated, which suggest that the sensor is capable of vector magnetic field measurement.
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Sakr, Mohammed, M. Hesham El Naggar et Moncef Nehdi. « Load transfer of fibre-reinforced polymer (FRP) composite tapered piles in dense sand ». Canadian Geotechnical Journal 41, no 1 (1 février 2004) : 70–88. http://dx.doi.org/10.1139/t03-067.

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This paper describes an experimental study conducted using a large, laboratory-scale testing facility to test pile segments at different stress levels. The objectives of the study were twofold: to examine the load-transfer mechanism of tapered piles in compression, and to evaluate the effect of pile material on pile performance characteristics. The results of axial compressive loading tests on 26 pile load tests were presented using fibre-reinforced polymer (FRP) concrete composite tapered piles and steel piles. Two installation techniques were used, including conventional head driving and toe driving using a new technique. Piles were tested at different confining pressures to represent a pile segment at depths of 4.0 and 8.0 m. The load distribution along the pile shafts was measured and the results were compared with those from an analytical solution in terms of the taper coefficient Kt. The comparison showed reasonable agreement between Kt values established from the experiments and those obtained from the analytical solution. The measured toe resistance of tapered and cylindrical piles was compared with those from the analytical solution. A simple rational approach was proposed for the design of tapered piles.Key words: tapered piles, FRP, pile capacity, axial performance, centrifuge modeling, shaft resistance, toe resistance.
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Henry, W. M., et F. P. Payne. « Solid-state tapered optical fibre devices ». Optical and Quantum Electronics 27, no 3 (mars 1995) : 185–91. http://dx.doi.org/10.1007/bf00563223.

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Thèses sur le sujet "Tapered Fibre"

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Mortimore, David Bryan. « Tapered fibre devices for optical fibre communication systems ». Thesis, University of Essex, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.296363.

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Farwell, Selina Gail. « Fused tapered fibre optic devices ». Thesis, University of Southampton, 1997. https://eprints.soton.ac.uk/394564/.

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This thesis is concerned with the realisation of an all-fibre acousto-optic device which can be used as a switch, filter, frequency shifter, polarisation controller or amplitude modulator, depending on the configuration. The devices are based on the acousto-optic interaction in fused tapered couplers and as such are completely compatible with fibre networks. For the first time polarisation insensitive devices have been realised by precisely controlling the degree of fibre fusion in an asymmetric coupler. This thesis details the theoretical considerations required to fabricate and operate all-fibre acousto-optic devices. The acousto-optic theory of circular cross-section devices is developed and extended to non-circular cross-sections. In this way all practical devices with non-circular cross-sections can be accurately modelled, and the optical bandwidth, switching speed and polarisation dependence can be tailored to a specific requirement. Polarisation independent operation is a serious obstacle in the development of practical photonic devices. This issue was resolved in this device by using geometric birefringence in the interaction region, produced by fusing the fibres of the null coupler to a precise degree of fusion. Polarisation independent operation is achieved with this technique without compromising other device parameters such as drive power. In order to fabricate these devices with the required uniformity, the tolerance on the manufacturing process was theoretically and experimentally studied. A new coupler rig was designed to operate within these tolerances. The coupler rig was capable of the manufacture of uniform devices both in the degree of fibre fusion and in the area of the device cross-section. The rig was optimised to produce low excess loss devices with high isolation between the output ports. In addition, it was possible to manufacture the length of the uniform tapered region over three times longer than previously possible. The incorporation of the non-circular operational theory enables non-destructive measurements of both the degree of fibre fusion and the device cross-sectional area, anywhere along the tapered region. Unlike competing technologies, geometric birefringence produces polarisation insensitive devices without compromising device parameters. This technique allows the following characteristics to be simultaneously achieved: 1) lower drive power, < 0.25 mW, 2) improved polarisation insensitivity, < 0.01 dB, 3) improved crosstalk, < -40 dB, 4) better excess loss, < 0.001 dB, 5) switching speeds of < 40 µs for a 25 mm long device, and 6) only one fabrication step.
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Hale, Zoe Miranda. « Fibre optic sensors using adiabatically tapered single mode fibres ». Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.320155.

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Lefrançois, Marcel. « Aspects of tapered optical fibre polarizers ». Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26720.

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This thesis proves that it is possible in principle to make in line optical fibre polarizers from tapered optical fibres surrounded by a quartz cladding. The theory of light propagation and polarization in fibres was reviewed as background information and several fabrication processes were evaluated and tried experimentally. The best results are obtained by heating a quartz tube in an oxy-propane flame, so that it collapses onto the fibre. Unfortunately, due to residues remaining between fibre and quartz tube, and due to large differences in melting points the results are quite irreproducible, and routine fabrication of polarizers with predictable properties is not yet feasible by the methods described in this thesis.
Science, Faculty of
Physics and Astronomy, Department of
Graduate
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Jarzebinska, Renata. « Tapered optical fibre sensors employing nanostructured coatings ». Thesis, Cranfield University, 2010. http://dspace.lib.cranfield.ac.uk/handle/1826/5585.

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Tapered optical fibres have been manufactured, characterised and studied. These are compact devices made from single-mode optical fibre. A system for producing tapers has been developed, employing flame heating of the optical fibre and computer controlled rotation stages to stretch the fibre in a controlled and repeatable fashion. Subsequently tapered fibres were coated with nanostructured films of materials that change their optical properties in response to an external stimulus. An investigation of the effect of depositing chemically sensitive nano-scale films onto tapered optical fibres has been undertaken. Three different methods of deposition were applied: Langmuir-Blodgett technique, electrostatic-self-assembly and – for the first time - chemical grafting. Six different films of materials were deposited onto tapered fibres: 4-[2-(4-dimethylamino- naphtalen-1-yl)-vinyl]-1-octadecyl-quinolinium iodide (merocyanine dye), calix[4]resorcinarene, bilayers of poly(allyamine hydrochloride) (PAH) and anionic tetrakis(4-sulfophenyl)porphine (TSPP), PAH and cyclodextrine, TiO2 nanoparticles imprinted with ((1-(4-Nitrophenylazo)-2-naphthol (NPAN) compound), polyaniline (PANI). During the deposition process the light was launched into each fibre and the evolution of the transmission spectrum observed. The coated tapers were subsequently investigated for their potential application as chemical sensors: pH, red-ox, ammonia sensors. The response to a stimulus was investigated by immersing the coated tapered fibre in an environment containing the measurand. The properties of these devices were also used in combination other photonics concepts, such as fibre Bragg gratings written in the tapered region of a fiber, under investigation within the Engineering Photonics Group to develop new sensor elements.
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Yerolatsitis, Stephanos. « Adiabatically tapered all-fibre devices for mode manipulation ». Thesis, University of Bath, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.707578.

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In this thesis we describe all-fibre devices that can be used for manipulating modes in a range of applications. The devices comprise an input and an output system and rely on fibre transitions. If the transition is gradual enough to be adiabatic, we can predict the behaviour of the output system depending only on the characteristics of the input system. Some of these devices work in a mode-selective regime where each input of the device excites a different mode at the output. These devices can be used to increase the data capacity of fibre networks where each mode can be used as an independent data channel. We also demonstrate mode converters that convert light to different higher-order modes of a ribbon fibre and can be used to increase the peak power transmitted in fibre lasers. Finally we describe devices that are non-mode-selective and have several cores. These devices convert the modes of a multimode core to the modes of a rectangular core made from individual fibres. These can be used as a diffraction-limited input to a spectrograph to eliminate modal noise from astronomical measurements.
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Ross, Steven. « Development of a novel gradient-force tapered fibre optical tweezers system for 3D optical trapping at near horizontal fibre insertion angles ». Thesis, Liverpool John Moores University, 2015. http://researchonline.ljmu.ac.uk/4461/.

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The use of optical fibre as a mechanism for the delivery of the trapping laser beam to the sample chamber significantly reduces both the size and the build costs of “Optical Tweezers”. Furthermore, the use of fibre facilitates the decoupling of the optical trapping beam from the microscope optics, which provides further scope for the development of a portable optical trapping system, and the potential for uncomplicated integration with other advanced microscopy systems such as an atomic force microscope (AFM) for example. For use with an AFM, the optical fibre must be inserted at an angle of 10° with respect to the sample chamber floor. However, previous literature suggests that 3D optical trapping with a single fibre inserted at an angle ≤20° is not feasible. This thesis presents the design, development, build and test of a single beam optical fibre based gradient force optical tweezers system and its associated software. An investigation is conducted to ascertain why optical trapping, using single fibre systems, cannot be achieved at sub 20° insertion angles, the result of which formed the basis of a hypothesis that explains this limitation. This finding led to the development of tapered optical fibre tips that are cable of 3D optical trapping at an insertion angle of ≤10°. The optimised optical fibre tapers are presented and their ability to trap both organic and inanimate material in 3D at an insertion angle of 10° is demonstrated. The near-horizontal insertion angle introduced a maximum trapping range (MTR). The MTR of the tips is determined empirically, evaluated against simulated data, and found to be tuneable through taper optimisation. Optical trap characterisation has been undertaken in terms of the optical trapping forces acting on the trapping subjects. Finally, the fibre tapering devices ability to reproduce identical tapers, or not, using the same device parameters, was investigated and the results in terms of geometric profile and optical performance are presented.
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Pennetta, Riccardo [Verfasser], Philip St J. [Akademischer Betreuer] Russell et Gustavo [Gutachter] Wiederhecker. « Tapered Glass-Fibre Nanospike Optomechanics / Riccardo Pennetta ; Gutachter : Gustavo Wiederhecker ; Betreuer : Philip St.J. Russell ». Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2019. http://d-nb.info/1180028376/34.

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LORENZI, ROBERTO. « Silica based functional materials : - Charge transport in nanostructured SnO2 : SiO2 thin films. - Second harmonic generation in niobium potassium silicate glasses. - Tapered silica optical microfibres for gas sensors ». Doctoral thesis, Università degli Studi di Milano-Bicocca, 2010. http://hdl.handle.net/10281/10933.

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"Charge transport in nanostructured SnO2:SiO2 thin films": Silica based nanostructured thin films grown on silicon substrates are promising materials for novel light emitter devices. In particular, tin dioxide is a wide band gap n-type semiconductor (Eg=3.6 eV) with an expected band-to-band emission centered in the ultraviolet (344 nm) region of the electromagnetic spectrum. Our group succesfully demonstrated UV emission from such systems, but at the beginning of my work many issues in charge transport processes needed to be explained. Aim of this project was to clarify electric transport and charge trapping mechanisms. As a result of a materials science approach we can now interpret the experimental data through specific relationships between synthesis conditions, clustering morphology (nanoparticle (NP) size distribution and volumic concetration, interphase substoichiometry, film thickness), and electric response. The observed phenomena have been analyzed within the percolation theory. Main results concern: electric transport of both holes and electrons is sustained by NP-to-NP hopping events and dielectric enhancement results from oscillating charges (holes) on NPs. "Second Harmonic Generation in potassium niobium silicate glasses": Second harmonic generation (SHG) is a non linear optical process largely employed in current laser technology and photonics. However in almost every application the material employed for these purposes are single crystals. Therefore the possibility to achieve large SHG in amorphous systems may lead to devices with innovative configurations. SHG may occur only if the system is non-centrosymmetric, therefore for glasses it is forbidden due to intrinsic isotropy. The inversion symmetry can be broken up with poling treatments. They consist in applying strong electrostatic field while the sample is stressed by external perturbation (typically heat, electron beam or laser light). We have explored the effect of thermal poling treatment on potassium niobium silicate glasses on inducing non linear optical properties. The results have revealed a strong SHG associated with structural modifications. The proposed mechanism involves a rearrangement of niobium oxide groups mediated by non bridging oxygen and potassium ion transport across the glass. These new charge arrangements form a non-centrosymmetric region underneath the anodic contact responsible of the detected SH signal. "Tapered silica optical microfibres for gas sensors": In the last years, tapered silica fibres have attracted much interest in photonic research, because of peculiar properties emerging in waveguides with lateral dimensions of the same order of the guided modes. In particular, in these structures the large evanescent field enables some interesting properties, such as microfluidic sensors and high Q optical resonators (coiling the tapered fibre), non-linear effects and supercontinuum generation. In this project, carried out at the University of Southampton (UK) in the group of Dr. Gilberto Brambilla, we have explored the feasibility of an innovative optical absorption device, based on ring down spectroscopy. In this case we are interested in a sensor for in-line application: a fluidic channel wrapped with tapered fibre in which the analyte can flow. The large power fraction outside the fibre interacts with the flowing medium and any change in the surrounding optical properties (refractive index or absorption coefficient) leads to a modification of the recorded light intensity propagating in the fibre. The idea is to exploit ring down time of a silica tapered microcoil resonator as an indicator of the absorption coefficient of a gas (or a liquid) flowing in the channel.
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Greenhalgh, Andrew Bryce. « Tapered polymer optical fibres for biosensing ». Thesis, Manchester Metropolitan University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.423074.

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Livres sur le sujet "Tapered Fibre"

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Kevin, O'Brien T., Rousseau Carl Q et United States. National Aeronautics and Space Administration., dir. Fatigue life methodology for tapered composite flexbeam laminates. [Washington, DC : National Aeronautics and Space Administration, 1997.

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Kevin, O'Brien T., Rousseau Carl Q et Langley Research Center, dir. Fatigue life methodology for tapered composite flexbeam laminates. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1997.

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Kevin, O'Brien T., Rousseau Carl Q et Langley Research Center, dir. Fatigue life methodology for tapered composite flexbeam laminates. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1997.

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Kevin, O'Brien T., Rousseau Carl Q et United States. National Aeronautics and Space Administration., dir. Fatigue life methodology for tapered composite flexbeam laminates. [Washington, DC : National Aeronautics and Space Administration, 1997.

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S, Raju I., O'Brien T. Kevin, Langley Research Center et United States. Army Aviation Research and Technology Activity., dir. Strain energy release rate analysis of delamination in a tapered laminate subjected to tension load. Hampton, Va : National Aeronautics and Space Administration, Langley Research Center, 1990.

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Laird, Tracey. Country Music and Television. Sous la direction de Travis D. Stimeling. Oxford University Press, 2017. http://dx.doi.org/10.1093/oxfordhb/9780190248178.013.28.

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The country music variety show Hee Haw simultaneously hearkened back to radio era precedents and embraced cutting edge production and editing techniques. This chapter situates Hee Haw’s 1969 debut among earliest examples of televised country music that merely added visual components to radio formats, followed by sitcoms like the Andy Griffith Show or Beverly Hillbillies that used country music for added color and bumpkin humor. Hee Haw embraced a rapid-fire, nonnarrative, “postmodern” aesthetic directly inspired by its predecessor, Laugh-In. Distinct from contemporary variety programs hosted by Johnny Cash or Glen Campbell, Hee-Haw taped in a studio with no live audience and efficiently pieced together its season via computerized, time-coded editing. Perpetuating comedic hillbilly stereotypes yet with a winking, tongue-in-cheek sense of sophistication, Hee Haw was purged from the CBS network in 1971 and continued production of new seasons via syndication until 1992.
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Chapitres de livres sur le sujet "Tapered Fibre"

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Zhang, Guoping, Zhuming Huang et Hai Ming. « Near-Field Optical Trap by Tapered Fibre Probe ». Dans Frontiers of Laser Physics and Quantum Optics, 611–14. Berlin, Heidelberg : Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-07313-1_76.

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Weik, Martin H. « tapered optical fiber ». Dans Computer Science and Communications Dictionary, 1735. Boston, MA : Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_19067.

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Filippov, Valery, Juho Kerttula et Oleg G. Okhotnikov. « Tapered Fiber Lasers and Amplifiers ». Dans Fiber Lasers, 177–232. Weinheim, Germany : Wiley-VCH Verlag GmbH & Co. KGaA, 2012. http://dx.doi.org/10.1002/9783527648641.ch6.

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Bing, Zhu, Liu Zhiyu, Hu Weiwei et Qian Jingren. « Polariser Formed by Tapered Metallic Fiber ». Dans Applications of Photonic Technology 2, 339–42. Boston, MA : Springer US, 1997. http://dx.doi.org/10.1007/978-1-4757-9250-8_55.

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Weik, Martin H. « fiber optic taper ». Dans Computer Science and Communications Dictionary, 597. Boston, MA : Springer US, 2000. http://dx.doi.org/10.1007/1-4020-0613-6_7026.

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Kishore, Putha, D. Dinakar, Manchineellu Padmavathi et L. Obulapathi. « Intensity Modulated U-Shaped Bent Tapered Optical Fiber Concentration Sensor ». Dans Lecture Notes in Electrical Engineering, 957–64. Singapore : Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7031-5_91.

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Subramaniam, P. C. « Optical Bistability in a Tapered Multimode Fiber with a Nonlinear Overlay ». Dans Photonic Switching II, 134–37. Berlin, Heidelberg : Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-76023-5_28.

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Birks, T. A., Y. W. Li, R. P. Kenny et K. P. Oakley. « A Simple Model for the Shape of Fibre Tapers ». Dans European Consortium for Mathematics in Industry, 319–22. Wiesbaden : Vieweg+Teubner Verlag, 1992. http://dx.doi.org/10.1007/978-3-663-09834-8_66.

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Shuai, Ci Jun, Ji An Duan et Jue Zhong. « Modelling of Fused Biconical Taper Process for Fibre Coupler ». Dans Advances in Machining & ; Manufacturing Technology VIII, 829–33. Stafa : Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-999-7.829.

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Herda, Robert, Matei Rusu, Samuli Kivistö et Oleg G. Okhotnikov. « Mode-locked ytterbium fiber laser with dispersion compensation by a fiber taper ». Dans Ultrafast Phenomena XV, 83–85. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-68781-8_27.

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Actes de conférences sur le sujet "Tapered Fibre"

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Birks, T. A., et J. C. Knight. « Excitation of Whispering Gallery Modes in Fibres by Fibres ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cthi2.

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We have recently reported the use of a narrow single-mode fibre taper to excite whispering gallery modes (WGMs) in fused silica microspheres[1]. Here we demonstrate the similar excitation of WGMs in dielectric cylinders. The dielectric cylinder is itself a tapered fibre, made by stretching the fibre in a flame to give a filament of predictable diameter. The two tapers are positioned at right angles and in contact. The transmission spectrum of the "sensor" taper (measured using a tunable diode laser) has dips at wavelengths where light is coupled from its guided mode to a WGM in the "target" taper.
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Korec, Joanna, Karol A. Stasiewicz, Olga Strzeżysz, Przemyslaw Kula, Joanna E. Moś et Leszek R. Jaroszewicz. « Tapered fibre liquid crystal optical device ». Dans Micro-Structured and Specialty Optical Fibres, sous la direction de Christian-Alexander Bunge, Kyriacos Kalli et Alexis Mendez. SPIE, 2018. http://dx.doi.org/10.1117/12.2309774.

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Yerolatsitis, S., K. Harrington et T. A. Birks. « All-fibre tapered pseudo-slit reformatter ». Dans CLEO : Applications and Technology. Washington, D.C. : OSA, 2016. http://dx.doi.org/10.1364/cleo_at.2016.jf1n.4.

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Moar, P. N., J. Katsifolis, L. W. Cahill, S. T. Huntington, K. A. Nugent, A. Roberts et J. D. Love. « Singlemode and Multimode Taper Optical Fibre Devices : Modelling, Testing and Fabrication ». Dans The European Conference on Lasers and Electro-Optics. Washington, D.C. : Optica Publishing Group, 1998. http://dx.doi.org/10.1364/cleo_europe.1998.cwe5.

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The evanescent field intensity outside a fibre can be increased several orders of magnitude by tapering it. Several tapered optical fibre based evanescent field devices have been reported in the literature. Cambridge University, UK, reported work on miniature dye lasers using a tapered fibre in a loop arrangement; but more importantly, a tapered single mode fibre bent into a small loop. This latter tapered device was used as an imunoassay for cholera antitoxin immunoglobulins and was based on fluorescence spectroscopy. The Naval Research Laboratories, USA, have reported on a MM tapered fibre which is chemically tapered to a point and can be used as a fluorescence based biosensor.
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Partridge, M., R. Jarzebinska, S. P. J. Higson, F. Davis, S. W. James et R. P. Tatam. « Curved tapered optical fibre surface pressure sensor ». Dans 2011 IEEE Sensors. IEEE, 2011. http://dx.doi.org/10.1109/icsens.2011.6127297.

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Markos, Christos, et Ole Bang. « Modulation-instability biosensing using an As2S3 chalcogenide tapered fiber ». Dans Australian Conference on Optical Fibre Technology. Washington, D.C. : OSA, 2016. http://dx.doi.org/10.1364/acoft.2016.jt4a.20.

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Pilla, P., A. Cusano, A. Cutolo, M. Giordano, M. L. Korwin-Pawlowski et W. J. Bock. « Nanocoating effects on tapered long period fiber gratings ». Dans Third European Workshop on Optical Fibre Sensors. SPIE, 2007. http://dx.doi.org/10.1117/12.738539.

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Iadicicco, A., S. Campopiano, A. Cutolo, A. Cusano, M. L. Korwin-Pawlowski et W. J. Bock. « Sensitivity characteristics in thinned long-period tapered gratings ». Dans Third European Workshop on Optical Fibre Sensors. SPIE, 2007. http://dx.doi.org/10.1117/12.738552.

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Aashna, Pragati, et Krishna Thyagarajan. « Adiabatic sum frequency conversion in a tapered waveguide ». Dans International Conference on Fibre Optics and Photonics. Washington, D.C. : OSA, 2016. http://dx.doi.org/10.1364/photonics.2016.w3a.63.

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Cullen, T. J., N. E. Jolley, F. Davis et J. Mun. « EDFA gain flattening using periodic tapered fibre filters ». Dans Optical Amplifiers and Their Applications. Washington, D.C. : OSA, 1997. http://dx.doi.org/10.1364/oaa.1997.faw13.

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Rapports d'organisations sur le sujet "Tapered Fibre"

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Smith, R. E., G. A. Vawter, G. R. Hadley, C. T. Sullivan, J. R. Wendt, B. Snipes et J. F. Klem. Tapered-rib adiabatic-following fiber coupler. Office of Scientific and Technical Information (OSTI), février 1996. http://dx.doi.org/10.2172/208338.

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Klingsporn, P. E. Coupling of Optical Energy From One Optical Fiber to Another of Like Kind, and to a Tapered Fiber, With and Without Small Sphere Lenses. Office of Scientific and Technical Information (OSTI), novembre 1999. http://dx.doi.org/10.2172/14219.

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