• Theoretical modeling and experimental verification of the scattering from a ferromagnetic microwire 

      Liberal Olleta, Íñigo Upna Orcid; Ederra Urzainqui,  Íñigo Upna Orcid; Gómez Polo, Cristina Upna Orcid; Labrador Otamendi, Alberto; Pérez de Landazábal Berganzo, José Ignacio Upna Orcid; Gonzalo García, Ramón Upna Orcid (IEEE, 2011)   Artículo / Artikulua  OpenAccess
      This contribution presents a theoretical modelling of the scattering of ferromagnetic microwires in free-space and inside a rectangular waveguide, providing both an analytical solution and a physical interpretation of ...
    • Towards a traceability system based on RFID technology to check the content of pallets within electronic devices supply chain 

      Angulo Martínez, Ignacio; Perallos Ruiz, Asier; Azpilicueta Fernández de las Heras, Leyre Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid; Hernández Jayo, Unai; Moreno, Asier; García Zuazola, Ignacio Julio (Hindawi, 2013)   Artículo / Artikulua  OpenAccess
      In the last few years there has been a growing interest in smart solutions capable of dealing with the traceability of products and materials to improve logistical processes. Most of the existing solutions have been ...
    • Transmission spectra changes produced by decreasing compactness of opal-like structures 

      Andueza Unanua, Ángel María Upna Orcid; Echeverría, R.; Morales Zimmermann, Paola Andrea Upna; Sevilla Moróder, Joaquín Upna Orcid (AIP Publishing, 2009)   Artículo / Artikulua  OpenAccess
      Artificial opal-like structures based on spheres and colloidal particles have been fabricated in a controlled way, presenting optical band-gap properties in the optical frequency range. Nonclose packed artificial opals ...
    • Tunable beam steering enabled by graphene metamaterials 

      Orazbayev, Bakhtiyar Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Khromova, Irina Upna Orcid (Optical Society of America, 2016)   Artículo / Artikulua  OpenAccess
      We demonstrate tunable mid-infrared (MIR) beam steering devices based on multilayer graphene-dielectric metamaterials. The effective refractive index of such metamaterials can be manipulated by changing the chemical potential ...
    • Tunable electro-optic wavelength filter based on lossy-guided mode resonances 

      Corres Sanz, Jesús María Upna Orcid; Ascorbe Muruzabal, Joaquín Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid (Optical Society of America, 2013)   Artículo / Artikulua  OpenAccess
      In this work an optical fiber tunable filter based on lossy guided-mode resonances (LGMR) is proposed. It consists of a multilayer structure deposited onto the surface of a plastic cladding removed multimode fiber. The ...
    • Tunable optical fiber pH sensors based on TE and TM Lossy Mode Resonances (LMRs) 

      Zubiate Orzanco, Pablo Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Del Villar, Ignacio Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      In this paper, a high sensitivity optical fiber pH sensor based on lossy mode resonance (LMR) generated with transversal electric (TE) and transversal magnetic (TM) polarized light is presented. Poly(allylamine hydrochloride) ...
    • Tunable SESAM-based mode-locked soliton fiber laser in linear cavity by axial-strain applied to a FBG 

      Aporta, I.; Leandro González, Daniel Upna Orcid; Quintela, M. A.; Pérez Herrera, Rosa Ana Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; López Higuera, José Miguel (IEEE, 2017)   Artículo / Artikulua  OpenAccess
      A self-started stable tunable mode-locked (ML) soliton fiber laser in a linear cavity structure composed by commercial passive elements is presented in this paper. It is based on the combination of an Erbium doped fiber ...
    • Ultra-compact planoconcave zoned metallic lens based on the fishnet metamaterial 

      Pacheco-Peña, Víctor Upna Orcid; Orazbayev, Bakhtiyar Upna Orcid; Torres Landívar, Víctor Upna; Beruete Díaz, Miguel Upna Orcid; Navarro Cía, Miguel Upna Orcid (AIP Publishing, 2013)   Artículo / Artikulua  OpenAccess
      A 1.5λ0 -thick planoconcave zoned lens based on the fishnet metamaterial is demonstrated experimentally at millimeter wavelengths. The zoning technique applied allows a volume reduction of 60% compared to a full fishnet ...
    • Ultra-long (290 km) remote interrogation sensor network based on a random distributed feedback fiber laser 

      Miguel Soto, Verónica de Upna Orcid; Leandro González, Daniel Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (Optical Society of America, 2018)   Artículo / Artikulua  OpenAccess
      In this work, an interferometric sensor has been interrogated 290 km away from the monitoring station, reaching the longest distance in fiber optic sensing up to date. This has been attained by employing a double-pumped ...
    • Ultra-wide band corrugated profiled horn antenna design 

      Teniente Vallinas, Jorge Upna Orcid; Gonzalo García, Ramón Upna Orcid; Río Bocio, Carlos del Upna Orcid (IEEE, 2002)   Artículo / Artikulua  OpenAccess
      Nowadays, an increasing number of applications need stable radiation patterns with low sidelobes and low crosspolar levels in a very wide bandwidth. Gaussian Profiled Horn Antennas (GPHA’s) have demonstrated its feasibility ...
    • Ultra-wideband metamaterial filter based on electroinductive-wave coupling between microstrips 

      Navarro Cía, Miguel Upna Orcid; Carrasco, José Miguel; Beruete Díaz, Miguel Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid (EMW Publishing, 2009)   Artículo / Artikulua  OpenAccess
      In this work, we analyse the frequency response of microstrip lines coupled by complementary split ring resonators (CSRRs) etched on the ground plane supporting electroinductive waves (EIWs). The single-particle ...
    • Ultrafast electrooptic dual-comb interferometry 

      Durán, Vicente; Tainta Ausejo, Santiago Upna Orcid; Torres Company, Víctor (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
      Dual-comb interferometry is a particularly compelling technique that relies on the phase coherence of two laser frequency combs for measuring broadband complex spectra. This method is rapidly advancing the field of optical ...
    • Ultrahigh sensitive detection of tau protein as Alzheimer's biomarker via microfluidics and nanofunctionalized optical fiber sensors 

      Chiavaioli, Francesco; Santano, Desiree Upna Orcid; Del Villar, Ignacio Upna Orcid; Socorro Leránoz, Abián Bentor Upna Orcid; Zhang, Xuejun; Li, Kaiwei; Santamaría, Enrique; Fernández Irigoyen, Joaquín Upna Orcid; Baldini, Francesco; Van den Hove, Daniel L. A.; Shi, Lei; Bi, Wei; Guo, Tuan; Giannetti, Ambra; Matías Maestro, Ignacio Upna Orcid (Wiley, 2022)   Artículo / Artikulua  OpenAccess
      Alzheimer’s disease (AD) is one of the most common neurodegenerative illnesses displaying the highest death rate in the elderly. However, the existing AD diagnostic system remains elusive due to lack of a technology that ...
    • Ultrahigh-sensitivity sensors based on thin-film coated long period gratings with reduced diameter, in transition mode and near the dispersion turning point 

      Del Villar, Ignacio Upna Orcid (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
      The mode transition and the dispersion turning point have been explored for optimization of thin-film coated long period fiber gratings during the last years. In this work and additional parameter, the cladding diameter, ...
    • Upper bounds on scattering processes and metamaterial-inspired structures that reach them 

      Ederra Urzainqui, Íñigo Upna Orcid; Liberal Olleta, Íñigo Upna Orcid; Gonzalo García, Ramón Upna Orcid; Ziolkowski, Richard W. (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      The physical limitations on time-harmonic scattering processes are investigated on the basis of the optical theorem. Previously derived least upper bounds on the total scattering and absorption cross-sections are obtained ...
    • Using S-parameter measurements to determine the threshold voltage, gain factor, and mobility degradation factor for microwave bulk-MOSFETs 

      Álvarez Botero, Germán Andrés; Torres-Torres, Reydezel; Murphy-Arteaga, Roberto S. (Elsevier, 2011)   Artículo / Artikulua  OpenAccess
      In this paper, we present an extraction and characterization methodology which allows for the determination, from S-parameter measurements, of the threshold voltage, the gain factor, and the mobility degradation factor, ...
    • Vertically coupled microring resonators using one epitaxial growth step and single-side lithography 

      García López, Óscar; Thourhout, Dries Van; Lasaosa Medarde, Daniel Upna; López-Amo Sáinz, Manuel Upna Orcid; Baets, Roel; Galarza Galarza, Marko Upna Orcid (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
      A new concept for the fabrication of integrated microring resonators, requiring only one single epitaxial growth and two single-side lithographic steps, is proposed in what is the simplest fabrication scheme for vertical ...
    • Vibration detection using optical fiber sensors 

      Rodríguez García, Yoany; Corres Sanz, Jesús María Upna Orcid; Goicoechea Fernández, Javier Upna Orcid (Hindawi, 2010)   Artículo / Artikulua  OpenAccess
      Condition monitoring of heavy electromechanical equipment is commonly accomplished in the industry using vibration analysis. Several techniques, mainly based on capacitive and piezoelectric accelerometers, have been applied ...
    • Vibrato in singing voice: the link between source-filter and sinusoidal models 

      Carlosena García, Alfonso Upna Orcid; Arroabarren Alemán, Ixone Upna (Springer Open, 2004)   Artículo / Artikulua  OpenAccess
      The application of inverse filtering techniques for high-quality singing voice analysis/synthesis is discussed. In the context of source-filter models, inverse filtering provides a noninvasive method to extract the voice ...
    • Volatile organic compound optical fiber sensors: a review 

      Elosúa Aguado, César Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Bariáin Aisa, Cándido Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (MDPI, 2006)   Artículo / Artikulua  OpenAccess
      Volatile organic compound (VOC) detection is a topic of growing interest with applications in diverse fields, ranging from environmental uses to the food or chemical industries. Optical fiber VOC sensors offering new and ...

      El Repositorio ha recibido la ayuda de la Fundación Española para la Ciencia y la Tecnología para la realización de actividades en el ámbito del fomento de la investigación científica de excelencia, en la Línea 2. Repositorios institucionales (convocatoria 2020-2021).
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