Recent Submissions

  • Zuntz optikoan oinarritutako sentsoreen prestazioen muga-efektu berria, egituren egoera monitorizatzea helburu 

    Iribas Pardo, Haritz; Mariñelarena Ollacarizqueta, Jon Upna; Loayssa Lara, Alayn Upna (Udako Euskal Unibertsitatea, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    Brillouin denbora-eremu optikoaren analisian (BOTDA) oinarritutako sentsoreak estruktura handien (120 km luzerako estrukturak) deformazioa eta tenperatura neurtzeko gaitasuna dute, metro bateko bereizmen espazialarekin. ...
  • Second-order nonlocal effects mitigation in Brillouin optical time-domain analysis sensors by tracking the Brillouin frequency shift profile of the fiber 

    Mompó Roselló, Juan José Upna; Iribas Pardo, Haritz Upna; Urricelqui Polvorinos, Javier Upna; Loayssa Lara, Alayn Upna (IEEE, 2017)   Artículo / Artikulua  OpenAccess
    We report on an additional limitation that has been found in Brillouin optical time-domain analysis (BOTDA) sensors due to the so-called second-order nonlocal effects (NLE). Second-order NLE appear in BOTDA setups that ...
  • Second-order non-local effects mitigation in BOTDA sensors by tracking the BFS profile 

    Mompó Roselló, Juan José Upna; Iribas Pardo, Haritz Upna; Urricelqui Polvorinos, Javier Upna; Loayssa Lara, Alayn Upna (SPIE, 2017)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
    We demonstrate a technique to mitigate the residual second-order non-local effects in Brillouin optical time-domain analysis (BOTDA) sensors in which the Brillouin frequency shift (BFS) profile is not uniform along the ...
  • A comprehensive analysis of the absorption spectrum of conducting ferromagnetic wires 

    Liberal Olleta, Íñigo Upna; Ederra Urzainqui, Íñigo Upna; Gómez Polo, Cristina; Labrador Otamendi, Alberto; Pérez de Landazábal Berganzo, José Ignacio; Gonzalo García, Ramón Upna (IEEE, 2012)   Artículo / Artikulua  OpenAccess
    A detailed analysis of the absorption spectrum of conductive ferromagnetic wires is presented. The absorption spectrum is computed from the solution to the scattering problem, and circuit models are formulated to clarify ...
  • Fe-rich ferromagnetic wires for self-sensing materials 

    Liberal Olleta, Íñigo Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna (IEEE, 2012)   Artículo / Artikulua  OpenAccess
    The possibility of using Fe-rich wires in mechanical stress self-sensing materials is investigated. To this end, a retrieval technique aimed to characterize the high-frequency magnetoimpedance effect in ferromagnetic wires ...
  • Dispersion properties of an elliptical patch with cross shaped aperture for synchronized propagation of transverse magnetic and electric surface waves 

    Tellechea Pereda, Amagoia Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Iriarte Galarregui, Juan Carlos Upna (MDPI, 2018)   Artículo / Artikulua  OpenAccess
    This paper presents a novel pixel geometry for the implementation of metasurfaces requiring synchronized phase propagation of transverse magnetic (TM) and transverse electric (TE) modes. The pixel is composed by an elliptical ...
  • Experimental validation of a Ku-band dual circularly polarized metasurface antenna 

    Tellechea Pereda, Amagoia Upna; Caminita, Francesco; Martini, Enrica; Ederra Urzainqui, Íñigo Upna; Teniente Vallinas, Jorge Upna; Iriarte, Juan Carlos; Gonzalo, Ramón; Maci, Stefano (IEEE, 2018)   Artículo / Artikulua  OpenAccess
    The experimental validation of a Ku-band dual circularly polarized (CP) broadside-beam metasurface (MTS) antenna is presented. A radially modulated anisotropic single layer MTS has been synthesised employing sub-wavelength ...
  • Comparison between capacitive and microstructured optical fiber soil moisture sensors 

    López Aldaba, Aitor Upna; López Torres, Diego Upna; Campo Bescós, Miguel Ángel Upna; López Rodríguez, José Javier; Yerro Lizarazu, David; Elosúa Aguado, César Upna; Arregui San Martín, Francisco Javier Upna; Auguste, Jean-Louis; Jamier, Raphael; Roy, Philippe; López-Amo Sáinz, Manuel Upna (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 ...
  • Optimizing interoperability between video-oculographic and electromyographic systems 

    Navallas Irujo, Javier Upna; Ariz Galilea, Mikel Upna; Villanueva Larre, Arantxa Upna; San Agustín, Javier; Cabeza Laguna, Rafael Upna (Rehabilitation Research & Development Service, 2011)   Artículo / Artikulua  OpenAccess
    A new system is presented that enhances the interoperability between a video-oculographic (VOG) system for mouse movement control and an electromyographic (EMG) system for mouse click detection. The proposed VOG-EMG system ...
  • Magnetic dipole super-resonances and their impact on mechanical forces at optical frequencies 

    Liberal Olleta, Íñigo Upna; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Ziolkowski, Richard W. (Optical Society of America, 2014)   Artículo / Artikulua  OpenAccess
    Artificial magnetism enables various transformative optical phenomena, including negative refraction, Fano resonances, and unconventional nanoantennas, beamshapers, polarization transformers and perfect absorbers, and ...
  • Exploiting the dispersion of the double-negative-index fishnet metamaterial to create a broadband low-profile metallic lens 

    Orazbayev, Bakhtiyar Upna; Pacheco Peña, Víctor Upna; Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
    Metamaterial lenses with close values of permittivity and permeability usually display low reflection losses at the expense of narrow single frequency operation. Here, a broadband low-profile lens is designed by exploiting ...
  • Dual-wavelength single-longitudinal-mode erbium fiber laser for temperature measurements 

    Díaz Lucas, Silvia Upna; López-Amo Sáinz, Manuel Upna (SPIE, 2014)   Artículo / Artikulua  OpenAccess
    A dual-wavelength erbium fiber laser with single-longitudinal-mode characteristic is proposed and demonstrated. The system uses a 7-m-long highly doped erbium-doped fiber as the primary gain medium while two fiber Bragg ...
  • Nanofilms on a hollow core fiber 

    Matías Maestro, Ignacio Upna; Bravo Larrea, Javier Upna; Arregui San Martín, Francisco Javier Upna; Corres Sanz, Jesús María Upna (SPIE, 2006)   Artículo / Artikulua  OpenAccess
    We experimentally study the behavior of one multimode fiber–hollow core fiber–multimode fiber structure when nanofilms are deposited on it with the aim of developing practical evanescent field-based devices, such as sensors, ...
  • Frozen mode from hybridized extraordinary transmission and Fabry-Perot resonances 

    Beruete Díaz, Miguel Upna; Rodríguez Ulibarri, Pablo Upna; Pacheco Peña, Víctor Upna; Navarro Cía, Miguel; Serebryannikov, Andriy E. (American Physical Society, 2013)   Artículo / Artikulua  OpenAccess
    Frozen modes arising in stacked subwavelength hole arrays are studied in detail. Their origin is proved to be connected with the interaction between the extraordinary transmission resonance and the Fabry–Perot cavity mode. ...
  • Wideband unidirectional transmission with tunable sign-switchable refraction and deflection in nonsymmetric structures 

    Rodríguez Ulibarri, Pablo Upna; Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna; Serebryannikov, Andriy E. (American Physical Society, 2013)   Artículo / Artikulua  OpenAccess
    A general theory of reciprocal unidirectional transmission with tunable sign-switchable refraction and deflection of outgoing wave in structures with broken spatial inversion symmetry is presented. Several coupling scenarios ...
  • Single-longitudinal-mode dual wavelength-switchable fiber laser based on superposed fiber bragg gratings 

    Pérez Herrera, Rosa Ana Upna; Rodriguez-Cobo, L.; Quintela, M. A.; López Higuera, José Miguel; López-Amo Sáinz, Manuel Upna (IEEE, 2015)   Artículo / Artikulua  OpenAccess
    n this work, a simple switchable dual-wavelength short-cavity fiber laser operating in a single-longitudinal-mode regime at room temperature and based on superposed fiber Bragg gratings is proposed and experimentally ...
  • Lensing system and Fourier transformation using epsilon-near-zero metamaterials 

    Navarro Cía, Miguel Upna; Beruete Díaz, Miguel Upna; Sorolla Ayza, Mario Upna; Engheta, Nader (American Physical Society, 2012)   Artículo / Artikulua  OpenAccess
    Metamaterials and metastructures with effective relative permittivity near zero exhibit unusual wave properties such as uniform phase distributions across such domains. Here we discuss the possibility of using ε-near-zero ...
  • Induction theorem analysis of resonant nanoparticles: design of a huygens source nanoparticle laser 

    Liberal Olleta, Íñigo; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Ziolkowski, Richard W. (American Physical Society, 2014)   Artículo / Artikulua  OpenAccess
    We propose an advanced formulation of standard antenna theory for the basic investigation and design of resonant nanoparticles. This methodology is based on transforming the original scattering problem into a radiation ...
  • Enhancement of the dynamic range in slope-assisted coherent brillouin optical time-domain analysis sensors 

    Mariñelarena Ollacarizqueta, Jon Upna; Urricelqui Polvorinos, Javier Upna; Loayssa Lara, Alayn Upna (IEEE, 2017)   Artículo / Artikulua  OpenAccess
    We present two techniques that provide an extension of the dynamic range of coherent Brillouin optical time-domain analysis (BOTDA) sensors for dynamic measurements. This type of BOTDA sensors rely on self-heterodyne ...
  • Dipolar resonances in conductive carbon micro-fibers probed by near-field terahertz spectroscopy 

    Khromova, Irina Upna; Navarro Cía, Miguel Upna; Brener, I.; Reno, J. L.; Ponomarev, A.; Mitrofanov, Oleg (AIP Publishing, 2015)   Artículo / Artikulua  OpenAccess
    We observe dipole resonances in thin conductive carbon micro-fibers by detecting an enhanced electric field in the near-field of a single fiber at terahertz (THz) frequencies. Time-domain analysis of the electric field ...

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