Now showing items 1-20 of 104

    • Aluminum doped zinc oxide (AZO) coated optical fiber LMR refractometers. An experimental demonstration 

      Ozcariz Celaya, Aritz Upna Orcid; Piña-Azamar, Dafne A.; Ruiz Zamarreño, Carlos Upna Orcid; Domínguez Cruz, René; Arregui San Martín, Francisco Javier Upna Orcid (Elsevier, 2019)   Artículo / Artikulua  OpenAccess
      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, ...
    • Analysis of one-dimensional photonic band gap structures with a liquid crystal defect towards development of fiber-optic tunable wavelength filters 

      Del Villar, Ignacio Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Claus, Richard O. (Optical Society of America, 2003)   Artículo / Artikulua  OpenAccess
      A theoretical analysis of a fiber optical photonic band gap based tunable wavelength filter is presented. The design presented here is based on the quarter wave reflector with a liquid crystal defect layer in the middle ...
    • An antibacterial coating based on a polymer/sol-gel hybrid matrix loaded with silver nanoparticles 

      Rivero Fuente, Pedro J. Upna Orcid; Urrutia Azcona, Aitor Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid (Springer, 2011)   Artículo / Artikulua  OpenAccess
      In this work a novel antibacterial surface composed of an organic-inorganic hybrid matrix of tetraorthosilicate and a polyelectrolyte is presented. A precursor solution of tetraethoxysilane (TEOS) and poly(acrylic acid ...
    • An antibacterial surface coating composed of PAH/SiO2 nanostructurated films by Layer by Layer 

      Urrutia Azcona, Aitor Upna Orcid; Rivero Fuente, Pedro J. Upna Orcid; Ruete Ibarrola, Leyre; Goicoechea Fernández, Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (2009)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      In this article we propose a novel antibacterial coating composed of SiO2 and the polymer Poly(allylamine hydrochloride) (PAH) on glass slides by the technique Layer-by- Layer (LbL)1. This technique has already used in ...
    • A comparative study in the sensitivity of optical fiber refractometers based on the incorporation of gold nanoparticles into layer-by-layer films 

      Rivero Fuente, Pedro J. Upna Orcid; Hernáez Sáenz de Zaitigui, Miguel Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (Exeley, 2015)   Artículo / Artikulua  OpenAccess
      In this work, optical fiber refractometers based on the successive incorporation of gold nanoparticles have been fabricated by means of the Layer-by-Layer Embedding (LbL-E) deposition technique. This enables the apparition ...
    • Comparative study of layer-by-layer deposition techniques for poly(sodium phosphate) and poly (allylamine hydrochloride) 

      Elosúa Aguado, César Upna Orcid; López Torres, Diego Upna Orcid; Hernáez Sáenz de Zaitigui, Miguel Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (Springer, 2013)   Artículo / Artikulua  OpenAccess
      An inorganic short chain polymer, poly(sodium phosphate), PSP, together with poly(allylamine hydrochloride), PAH, is used to fabricate layer-by-layer (LbL) films. The thickness, roughness, contact angle, and optical ...
    • A comparative study of two different approaches for the incorporation of silver nanoparticles into layer-by-layer films 

      Rivero Fuente, Pedro J. Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (Springer, 2014)   Artículo / Artikulua  OpenAccess
      In this work, a comparative study about the incorporation of silver nanoparticles (AgNPs) into thin films is presented using two alternative methods, the in situ synthesis process and the layer-by-layer embedding deposition ...
    • Comparison between capacitive and microstructured optical fiber soil moisture sensors 

      López Aldaba, Aitor Upna; López Torres, Diego Upna Orcid; Campo-Bescós, Miguel Upna Orcid; López Rodríguez, José Javier Upna Orcid; Yerro Lizarazu, David; Elosúa Aguado, César Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna Orcid (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      Soil moisture content has always been an important parameter to control because it is a deterministic factor for site-specific irrigation, seeding, transplanting, and compaction detection. In this work, a discrete sensor ...
    • Comparison between different structures of suspended-core microstructured optical fibers for volatiles sensing 

      López Torres, Diego Upna Orcid; López Aldaba, Aitor Upna; Elosúa Aguado, César Upna Orcid; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      In this paper, different core structures of microstructured optical fibers (MOFs) for low-finesse Fabry-Perot (FP) sensors are experimentally compared to get the highest sensitivity. These devices are designed for volatile ...
    • A comprehensive review: materials for the fabrication of optical fiber refractometers based on lossy mode resonance 

      Ozcariz Celaya, Aritz Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      Lossy mode resonance based sensors have been extensively studied in recent years. The versatility of the lossy mode resonance phenomenon has led to the development of sensors based on different configurations that make use ...
    • Continuous liquid-level sensor based on a long-period grating and microwave photonics filtering techniques 

      Ricchiuti, Amelia L.; Barrera, D.; Urrutia Azcona, Aitor Upna Orcid; Goicoechea Fernández, Javier Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      A fiber optic liquid-level sensor based on a long period grating (LPG) is proposed and experimentally validated. The principle of operation is based on a technique used to analyze microwave photonics filters. A 4-cm-long ...
    • Contribución al desarrollo de refractómetros de fibra óptica basados en resonancias de modos con pérdidas 

      Sánchez Zábal, Pedro Upna Orcid (2017)   Tesis doctoral / Doktoretza tesia  OpenAccess
      El desarrollo de nuevos materiales y métodos de deposición a escala nanométrica ha supuesto una auténtica revolución en muchas disciplinas de la investigación. En particular, los recubrimientos nanoestructurados permiten ...
    • Contribution to the development of functional nanostructured coatings based on silver nanoparticles 

      Rivero Fuente, Pedro J. Upna Orcid (2014)   Tesis doctoral / Doktoretza tesia  OpenAccess
      Esta tesis se centra en la síntesis de nanopartículas de plata (AgNPs) y su posterior incorporación en recubrimientos delgados usando dos métodos alternativos: el proceso de síntesis in situ (ISS) de AgNPs y la técnica de ...
    • Contribution to the development of optical fibre sensors based on microstructured optical fibres to detect gases and volatile organic compounds 

      López Torres, Diego Upna Orcid (2019)   Tesis doctoral / Doktoretza tesia  OpenAccess
      Desde la primera publicación relacionada con las fibras micro estructuradas (MOFs), el desarrollo de sensores basados en fibra óptica (OFSs), que utilizan este tipo de fibras, se ha visto incrementado atrayendo el interés ...
    • Copper oxide coated D-shaped optical fibers for the development of LMR refractometers 

      Ozcariz Celaya, Aritz Upna Orcid; Vitoria Pascual, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid (IEEE, 2020)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Lossy mode resonance (LMR) based refractometers obtained by means of copper oxide thin-films fabricated onto side-polished (D-shaped) are presented in this work. The high refractive index of copper oxide combined with the ...
    • Deposition of an overlay with electrostactic self-assembly method in long period fiber gratings 

      Del Villar, Ignacio Upna Orcid; Achaerandio, Miguel Upna; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (Optical Society of America, 2005)   Artículo / Artikulua  OpenAccess
      It was proved that the deposition of an overlay material onto a long-period fiber grating causes important shifts in the wavelengths of the typical attenuation bands that are caused by coupling between cladding and core ...
    • Deposition of coatings on long-period fiber gratings: tunnel effect analogy 

      Del Villar, Ignacio Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (Springer, 2006)   Artículo / Artikulua  OpenAccess
      The sensitivity of Long-period fiber gratings (LPFGs), coated with high-refractive-index thin film overlays, to the refractive index and the thickness of the overlay, and to the ambient refractive index, can be enhanced ...
    • Design rules for lossy mode resonance based sensors 

      Del Villar, Ignacio Upna Orcid; Hernáez Sáenz de Zaitigui, Miguel Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Sánchez Zábal, Pedro Upna Orcid; Fernández Valdivielso, Carlos Upna; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid (Optical Society of America, 2012)   Artículo / Artikulua  OpenAccess
      Lossy mode resonances can be obtained in the transmission spectrum of cladding removed multimode optical fiber coated with a thin-film. The sensitivity of these devices to changes in the properties of the coating or the ...
    • Detection of ethanol in human breath using optical fiber long period grating coated with metal-organic frameworks 

      Acha Morrás, Nerea de Upna Orcid; Hromadka, Jiri; Tokay, Begum; Correia, Ricardo; Elosúa Aguado, César Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Morgan, Stephen P.; Korposh, Sergiy (MDPI, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      An optical fiber sensor for ethanol detection in exhaled breath has been developed. It has been fabricated by functionalizing a Long Period Grating with a metal-organic framework, ZIF-8. The sensor’s response was tested ...
    • Development of an aptamer based luminescent optical fiber sensor for the continuous monitoring of Hg2+ in aqueous media 

      Acha Morrás, Nerea de Upna Orcid; Elosúa Aguado, César Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2020)   Artículo / Artikulua  OpenAccess
      A fluorescent optical fiber sensor for the detection of mercury (Hg2+) ions in aqueous solutions is presented in this work. The sensor was based on a fluorophore-labeled thymine (T)-rich oligodeoxyribonucleotide (ON) ...