Suchergebnisse

Lossy mode resonances (LMR) have been studied as an exceptional phenomenon for the development of optical fiber refractometers. These sensors rely on the interaction of the light propagating through the waveguide with a thin-film fabricated onto it. The properties of such film will determine the sensitivity of the LMR to surrounding refractive index variations. The nature of the film will also play an important role on the possibilities to develop sensing applications. This thesis analyzes the use of four different materials (tin oxide, aluminum-doped zinc oxide, indium-gallium-zinc oxide and copper oxide) for the development of LMR-based refractometers. First, the optimization on the fabrication process of tin oxide coatings is described, with the purpose of maximizing the sensitivity in a refractive index range close of the fused silica (1.44). Then, materials based on zinc oxide are presented for the first time for the fabrication of LMR-based sensors: aluminum-doped zinc oxide (AZO) and indium-gallium-zinc oxide (IGZO), leading to the development of several sensors working in the visible and near-infrared wavelength range. The last material analyzed in this work is copper oxide, which presents a refractive index considerably larger than the previously studied materials. Such feature is suggested to provide a greater sensitivity of the LMR to SRI variations, promising a better performance than the one achieved with different thin-films. ; The author would like to thank the Spanish Ministry of Universities (FPU15/05663 grant), as well as the Ministry of Economy, Industry and Competitiveness (TEC2016-78047-R) and the Government of Navarra (Bioptsens Avanza) for their financial support. ; Programa de Doctorado en Tecnologías de las Comunicaciones, Bioingeniería y de las Energías Renovables (RD 99/2011) ; Bioingeniaritzako eta Komunikazioen eta Energia Berriztagarrien Teknologietako Doktoretza Programa (ED 99/2011)

A tin dioxide thin layer has been studied in order to improve the sensitivity of lossy mode resonances (LMR) based sensors. The effects of the thin film thickness and the polarization of light in a SnO2 coated D-shaped single mode optical fiber have been evaluated. The optimization of such parameters in the fabrication of refractometers have led to an unprecedented sensitivity of over one million nanometers per refractive index unit (RIU), which means a sensitivity below 10^(−9) RIU with a pm resolution detector. This achievement is a milestone for the development of new high sensitivity devices and opens the door to new industrial applications, such as gear oil degradation, or biomedical devices where previous devices could not provide enough sensitivity. ; The authors would like to acknowledge the partial support to the Spanish Ministry of Economy and Competitiveness TEC2016-79367-C2-2-R research funds, the Spanish Ministry of Education FPU15/05663 predoctoral research grant, the Public University of Navarre (UPNA) pre-doctoral research grant and Government of Navarre 2016/PC026 BIOPTSENS and 64/2015 research funds.

This work presents the experimental demonstration of lossy mode resonance generation by means of aluminum doped zinc oxide thin-films. The use of such material may allow to optimize the performance of LMR-based sensors, obtaining good sensitivity at lower costs than other overlays, such as those including indium. The refractometric response of the fabricated devices is explored in different spectral regions. One refractometer working in the near infrared region was fabricated, obtaining a sensitivity of 2280 nm/RIU. A second refractometer working in the visible light spectrum was also fabricated. This second device allows to observe rough refractive index variations with the naked eye as a change of the color of the light propagating through the fiber, simplifying the setup needed for its use. ; This work was partly supported by the Spanish Agencia Estatal de Investigación (AEI) and Fondo Europeo de Desarrollo Regional (FEDER) (TEC2016-79367-C2-2-R, TEC2016-78047-R ). The authors would also like to thanks the Spanish Ministry of Education (FPU15/05663 grant) and the Government of Navarra 0C023/024 BIOPTSENS and 64/2015 research funds. Dafne A. Piña-Azamar thanks CONACYT for scholarship assigned and PFCE-UAT 2016 project for the financial support to carry out this work.

This work discusses an application of electrically conductive and optically transparent indium-gallium-zinc oxide (IGZO) thin films for fabrication of lossy mode resonance (LMR) based optical fiber refractometers. The films have been deposited on both 200 μm in diameter multimode fused silica fiber and D-shaped fiber structure. A sensitivity of 12,929 nm/RIU was obtained in the refractive index range between 1.39 and 1.42. In case of D-shaped fiber structure the effect of polishing depth on the LMR phenomenon has also been studied. ; This work was supported in part by the Spanish Agencia Estatal de Investigación (AEI) and Fondo Europeo de Desarrollo Regional (FEDER) (TEC2016-79367-C2-2-R, TEC2016-78047-R), as well as by the Spanish Ministry of Education (FPU15/05663 grant) and the Government of Navarra 2016/PI044 NANOSEN, 0C023/024 BIOPTSENS and 64/2015 research funds. Support from National Science Centre, Poland within grant No. 2014/14/E/ST7/00104 is also acknowledged.

According to recent market studies of the North American company Allied Market Research, the field of photonic sensors is an emerging strategic field for the following years and it is expected to garner $18 billion by 2021. The integration of micro and nanofabrication technologies in the field of sensors has allowed the development of new technological concepts such as lab-on-a-chip, which have achieved extraordinary advances in terms of detection and applicability, for example in the field of biosensors. This continuous development has allowed that equipment consisting of many complex devices that occupied a whole room a few years ago, at present it is possible to handle them in the palm of the hand; that formerly long duration processes are carried out in a matter of milliseconds and that a technology previously dedicated solely to military or scientific uses is available to the vast majority of consumers. The adequate combination of micro and nanostructured coatings with optical fiber sensors has permitted us to develop novel sensing technologies, such as the first experimental demonstration of lossy mode resonances (LMRs) for sensing applications, with more than one hundred citations and related publications in high rank journals and top conferences. In fact, fiber optic LMR-based devices have been proven as devices with one of the highest sensitivity for refractometric applications. Refractive index sensitivity is an indirect and simple indicator of how sensitive the device is to chemical and biological species, topic where this proposal is focused. Consequently, the utilization of these devices for chemical and biosensing applications is a clear opportunity that could open novel and interesting research lines and applications as well as simplify current analytical methodologies. As a result, on the basis of our previous experience with LMR based sensors to attain very high sensitivities, the objective of this paper is presenting the route for the development of label-free optical waveguide sensing platform ...

According to recent market studies of the North American company Allied Market Research, the field of photonic sensors is an emerging strategic field for the following years and it is expected to garner $18 billion by 2021. The integration of micro and nanofabrication technologies in the field of sensors has allowed the development of new technological concepts such as lab-on-a-chip which have achieved extraordinary advances in terms of detection and applicability, for example in the field of biosensors. This continuous development has allowed that equipment consisting of many complex devices that occupied a whole room a few years ago, at present it is possible to handle them in the palm of the hand; that formerly long duration processes are carried out in a matter of milliseconds and that a technology previously dedicated solely to military or scientific uses is available to the vast majority of consumers. The adequate combination of micro and nanostructured coatings with optical fiber sensors has permitted us to develop novel sensing technologies, such as the first experimental demonstration of lossy mode resonances (LMRs) for sensing applications, with more than one hundred citations and related publications in high rank journals and top conferences. In fact, fiber optic LMR-based devices have been proven as devices with one of the highest sensitivity for refractometric applications. Refractive index sensitivity is an indirect and simple indicator of how sensitive the device is to chemical and biological species, topic where this proposal is focused. Consequently, the utilization of these devices for chemical and biosensing applications is a clear opportunity that could open novel and interesting research lines and applications as well as simplify current analytical methodologies. As a result, on the basis of our previous experience with LMR based sensors to attain very high sensitivities, the objective of this paper is presenting the route for the development of label-free optical waveguide sensing platform based on LMRs that enable to explore the limits of this technology for bio-chemosensing applications. ; This work was supported in part by the Spanish Ministry of Education and Science-FEDER TEC2016- 78047-R, Government of Navarra 0011-1365-2017- 000117 and Public University of Navarra PJUPNA26 research grants as well as the ATTRACT call financed by the European Union's Horizon 2020 research and innovation programme under grant agreement No. 777222.