Envíos recientes

  • Contributions to Head Pose Estimation methods 

    Ariz Galilea, Mikel (2016)   Tesis doctoral / Doktoretza tesia  OpenAccess
    Head Pose Estimation (HPE) is currently a growing research field, mainly because of the proliferation of human-computer interfaces (HCI) in the last decade. It offers a wide variety of applications, including driver ...
  • Diseño y aplicaciones de un elemento activo universal 

    Cabeza Laguna, Rafael Upna (Universidad Pública de Navarra / Nafarroako Unibertsitate Publikoa, 1996)   Tesis doctoral / Doktoretza tesia  OpenAccess
    La lista de elementos activos presentes en el comienzo de la década de los noventa es numerosa y no exenta de repeticiones o conceptos poco útiles. Por otra parte no se presenta en la literatura ningún esfuerzo a la hora ...
  • Analysis, characterization and modeling of interference sources on wireless communication systems in complex indoor scenarios 

    López Iturri, Peio Upna (2017)   Tesis doctoral / Doktoretza tesia  OpenAccess
    This research work presents a novel methodology of assessing wireless interferences on Wireless Sensor Networks (WSN) by the aid of an in-house developed 3D Ray Launching method, which is a novel deterministic approach ...
  • Development of ultrathin metasurface and partially reflective surface antennas for space applications 

    Tellechea Pereda, Amagoia Upna (2017)   Tesis doctoral / Doktoretza tesia  OpenAccess
    La industria espacial ha estado siempre muy interesada en la evolución de las antenas que se integran en los satélites. Se buscan soluciones que además de ser ligeras y compactas, tengan un coste reducido. De esta forma ...
  • Temperature sensor based on a hybrid ITOsilica resonant cavity 

    Socorro Leránoz, Abián Bentor Upna; Soltani, Soheil; Del Villar, Ignacio Upna; Corres Sanz, Jesús María Upna; Armani, Andrea M. (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
    Integrated optical devices comprised of multiple material systems are able to achieve unique performance characteristics, enabling applications in sensing and in telecommunications. Due to ease of fabrication, the majority ...
  • Fiber-optic lossy mode resonance sensors 

    Arregui San Martín, Francisco Javier Upna; Del Villar, Ignacio Upna; Corres Sanz, Jesús María Upna; Goicoechea Fernández, Javier Upna; Ruiz Zamarreño, Carlos Upna; Elosúa Aguado, César Upna; Hernáez Sáenz de Zaitigui, Miguel Upna; Rivero Fuente, Pedro José Upna; Socorro Leránoz, Abián Bentor Upna; Urrutia Azcona, Aitor Upna; Sánchez Zábal, Pedro Upna; Zubiate, Pablo; López Torres, Diego Upna; Acha Morrás, Nerea de Upna; Matías Maestro, Ignacio Upna (Elsevier, 2014)   Contribución a Congreso / Biltzarrerako ekarpena  OpenAccess
    In the last 4 years, experimental evidences about the potential use of optical sensors based on Lossy Mode Resonances (LMR) have been presented in the literature. These LMR sensors have some similarities with Surface ...
  • Nanodeposition of materials with complex refractive index in long period fiber gratings 

    Del Villar, Ignacio Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Achaerandio, Miguel Upna (IEEE, 2005)   Artículo / Artikulua  OpenAccess
    An overlay of higher refractive index than the cladding is deposited on a Long Period Fiber Grating (LPFG). This permits to improve in a great manner the sensitivity of the device to ambient and overlay refractive index ...
  • ESA-based in-fiber nanocavity for hydrogen–peroxide detection 

    Del Villar, Ignacio Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Claus, Richard O. (IEEE, 2005)   Artículo / Artikulua  OpenAccess
    A fiber-optic sensor sensitive to hydrogen peroxide has been designed based on the electrostatic layer-by-layer selfassembly method. Prussian blue has been deposited in a polymeric structure formed by Poly(allylamine ...
  • Enhancement of sensitivity in long period fiber gratings with deposition of low refractive index materials 

    Del Villar, Ignacio Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna (Optical Society of America, 2005)   Artículo / Artikulua  OpenAccess
    It was proved [Opt. Lett. 30, 720 (2005)] that the deposition of an overlay of higher refractive index than that of the cladding on a long-period fiber grating (LPFG) causes large shifts in the attenuation bands induced by ...
  • Deposition of an overlay with electrostactic self-assembly method in long period fiber gratings 

    Del Villar, Ignacio Upna; Achaerandio, Miguel Upna; Matias, Ignacio R.; Arregui San Martín, Francisco Javier Upna (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 ...
  • Influence in cladding mode distribution of overlay deposition on long-period fiber gratings 

    Del Villar, Ignacio Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna (Optical Society of America, 2006)   Artículo / Artikulua  OpenAccess
    A thin overlay of higher refractive index than that of the cladding of a long-period fiber grating induces in cladding modes strong variations in effective index, mode profile, cross-coupling coefficient with the core ...
  • Luminescence-based optical sensors fabricated by means of the layer-by-layer nano-assembly technique 

    Acha Morrás, Nerea de Upna; Elosúa Aguado, César Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
    Luminescence-based sensing applications range from agriculture to biology, including medicine and environmental care, which indicates the importance of this technique as a detection tool. Luminescent optical sensors are ...
  • An optimized method based on digitalized Lissajous curve to determine fifetime of luminescent materials on optical fiber sensors 

    Ridruejo Muro, Adrián; Acha Morrás, Nerea de Upna; Elosúa Aguado, César Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna (Hindawi Publishing Corporation, 2016)   Artículo / Artikulua  OpenAccess
    A method is proposed to determine lifetime of luminescent emissions based on the phase shift measurement employing the digitalized Lissajous representation: this diagramhas been typically used with analogical algorithms, ...
  • Long period fiber gratings with overlay of variable refractive index 

    Del Villar, Ignacio Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna (IEEE, 2005)   Artículo / Artikulua  OpenAccess
    A theoretical analysis is presented of a long-period fiber grating (LPFG) with an overlay of variable refractive index. The highest sensitivity of the resonance wavelengths to variations in the refractive index of the ...
  • Strategies for fabrication of hydrogen peroxide sensors based on electrostatic self-assembly (ESA) method 

    Del Villar, Ignacio Upna; Matías Maestro, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Echeverría, Jesus; Claus, Richard O. (Elsevier, 2004)   Artículo / Artikulua  OpenAccess
    An optical fiber sensor has been fabricated for detection of 5 M–0.1mM concentrations of hydrogen peroxide with a linear response. The deposition method used is electrostatic self-assembly (ESA) of polymer cationic and ...
  • Spectral evolution with incremental nanocoating of long period fiber gratings 

    Del Villar, Ignacio Upna; Corres Sanz, Jesús María Upna; Achaerandio, Miguel Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (Optical Society of America, 2006)   Artículo / Artikulua  OpenAccess
    The incremental deposition of a thin overlay on the cladding of a long-period fiber grating (LPFG) induces important resonance wavelength shifts in the transmission spectrum. The phenomenon is proved theoretically with ...
  • Generation of selective fringes with cascaded long-period gratings 

    Del Villar, Ignacio Upna; Achaerandio, Miguel Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (IEEE, 2006)   Artículo / Artikulua  OpenAccess
    The inscription of cascaded long-period gratings of different periods in optical fiber permits us to obtain both narrowband and wideband filters in the same spectrum. If used as an optical transducer, it may permit us ...
  • Fringe generation with non-uniformly coated long-period fiber gratings 

    Del Villar, Ignacio Upna; Arregui San Martín, Francisco Javier Upna; Matias, Ignacio R.; Cusano, Andrea; Paladino, Domenico; Cutolo, Antonello (Optical Society of America, 2007)   Artículo / Artikulua  OpenAccess
    In this work, the spectral characteristics of non-uniform symmetrically ring shaped coatings deposited on long-period fiber gratings (LPFGs) have been theoretically and experimentally investigated. To optimize the ...
  • Generation of lossy mode resonances by deposition of high-refractive-index coatings on uncladded multimode optical fibers 

    Del Villar, Ignacio Upna; Ruiz Zamarreño, Carlos Upna; Sánchez Zábal, Pedro Upna; Hernaez, Miguel; Fernández Valdivielso, Carlos Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (IOP Publishing Ltd, 2010)   Artículo / Artikulua  OpenAccess
    A comparative study of lossy mode resonances generated by depositing two different materials is presented. The two materials selected are indium tin oxide (ITO) and indium oxide. The two materials present different ...
  • Generation of lossy mode resonances with absorbing thin-films 

    Del Villar, Ignacio Upna; Ruiz Zamarreño, Carlos Upna; Hernaez, Miguel; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (IEEE, 2010)   Artículo / Artikulua  OpenAccess
    The generation of lossy mode resonances with absorbing thin-films is analyzed with electromagnetic theory. The main differences with surface plasmon resonances are presented and some rules are given towards an optimum ...

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