• Photonic crystal fiber temperature sensor based on quantum dot nanocoatings 

      Larrión Zabaleta, Beatriz; Hernáez Sáenz de Zaitigui, Miguel Upna; Arregui San Martín, Francisco Javier Upna; Goicoechea Fernández, Javier Upna; Bravo Larrea, Javier Upna; Matías Maestro, Ignacio Upna (Hindawi / Wiley, 2009)   Artículo / Artikulua  OpenAccess
      Quantum dot nanocoatings have been deposited by means of the Layer-by-Layer technique on the inner holes of Photonic Crystal Fibers (PCFs) for the fabrication of temperature sensors. The optical properties of these sensors ...
    • Photonic crystal fibers for sensing applications 

      Rodrigues Pinto, Ana Margarida Upna; López-Amo Sáinz, Manuel Upna (Hindawi Publishing Corporation, 2012)   Artículo / Artikulua  OpenAccess
      Photonic crystal fibers are a kind of fiber optics that present a diversity of new and improved features beyond what conventional optical fibers can offer. Due to their unique geometric structure, photonic crystal fibers present ...
    • Planar holographic metasurfaces for terahertz focusing 

      Kuznetsov, Sergei A.; Astafev, Mikhail A.; Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna (Springer Nature, 2015)   Artículo / Artikulua  OpenAccess
      Scientists and laymen alike have always been fascinated by the ability of lenses and mirrors to control light. Now, with the advent of metamaterials and their two-dimensional counterpart metasurfaces, such components can ...
    • Planar magnetoinductive wave transducers: theory and applications 

      Freire, M. J.; Marqués, R.; Medina, Francisco; Gómez Laso, Miguel Ángel Upna; Martín, F. (AIP Publishing, 2004)   Artículo / Artikulua  OpenAccess
      Transduction of magnetoinductive waves (MIWs) in planar technology is demonstrated. A transducer consisting of a one-dimensional periodic array of metallic split squared ring resonators (SSRR), placed between a pair of ...
    • Planoconcave lens by negative refraction of stacked subwavelength hole arrays 

      Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna; Sorolla Ayza, Mario Upna; Campillo, Igor (Optical Society of America, 2008)   Artículo / Artikulua  OpenAccess
      This work presents the design of a planoconcave parabolic negative index metamaterial lens operating at millimeter wavelengths fabricated by using stacked subwavelength hole arrays. A staircase approximation to the ideal ...
    • Polarization diversity scheme for BOTDA sensors based on a double orthogonal pump interaction 

      Urricelqui Polvorinos, Javier Upna; López Fernandino, Felipe; Sagüés García, Mikel Upna; Loayssa Lara, Alayn Upna (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      We introduce a Brillouin optical time domain analysis (BOTDA) sensor deploying a novel polarization diversity technique based on the use of two orthogonal pump pulses which simultaneously interact with a phase modulated ...
    • Polarization selection with stacked hole array metamaterial 

      Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna; Sorolla Ayza, Mario Upna; Campillo, Igor (AIP Publishing, 2008)   Artículo / Artikulua  OpenAccess
      Polarization rotation or selection appears in materials with optical activity, or those with Faraday effect, or in liquid crystals. In this letter we present a structure, with an analogous response, using stacked ...
    • Polarization-tunable negative or positive refraction in self-complementariness-based extraordinary transmission prism 

      Navarro Cía, Miguel Upna; Beruete Díaz, Miguel Upna; Falcone Lanas, Francisco Javier Upna; Sorolla Ayza, Mario Upna (EMW Publishing, 2010)   Artículo / Artikulua  OpenAccess
      Here we report a prism made of stacked quasi-selfcomplementary extraordinary transmission surfaces which allows simultaneously left- and right-handed propagation within the V-band for vertical and horizontal polarizations, ...
    • Polarized left-handed extraordinary optical transmission of subterahertz waves 

      Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna; Sorolla Ayza, Mario Upna; Campillo, Igor (Optical Society of America, 2007)   Artículo / Artikulua  OpenAccess
      In this paper we design and measure a metamaterial polarizing device working in the sub-terahertz range. The polarizer is based on a modified version of our previous miniaturized Stacked Hole Array (SHA) structure, an ...
    • Polypropylene-substrate-based SRR- and CSRR-metasurfaces for submillimeter waves 

      Aznabet, Mariem; Navarro Cía, Miguel Upna; Kuznetsov, Sergei A.; Gelfand, A. V.; Fedorinina, N. I.; Goncharov, Yu. G.; Beruete Díaz, Miguel Upna; El Mrabet, O.; Sorolla Ayza, Mario Upna (Optical Society of America, 2008)   Artículo / Artikulua  OpenAccess
      In this paper it is presented the fabrication of low loss millimeter wave metamaterials based on patterning on polypropylene substrates by conventional contact photolitography. We study numerically and experimentally ...
    • Producing and exploiting simultaneously the forward and backward coupling in EBG-assisted microstrip coupled lines 

      Percaz Ciriza, Jon Mikel Upna; Chudzik, Magdalena Upna; Arnedo Gil, Israel Upna; Arregui Padilla, Iván Upna; Teberio Berdún, Fernando Upna; Gómez Laso, Miguel Ángel Upna; Lopetegui Beregaña, José María Upna (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      In this paper, a methodology is proposed for the design of EBG-assisted coupled line structures in microstrip technology, controlling independently the forward and backward coupling. It is based on the use of a ...
    • Pyridine vapors detection by an optical fibre sensor 

      Elosúa Aguado, César Upna; Bariáin Aisa, Cándido Upna; Matías Maestro, Ignacio Upna; Rodríguez, Antonio; Colacio, Enrique; Salinas Castillo, Alfonso; Segura Carretero, Antonio; Fernández Gutiérrez, Alberto (MDPI, 2008)   Artículo / Artikulua  OpenAccess
      An optical fibre sensor has been implemented towards pyridine vapors detection; to achieve this, a novel vapochromic material has been used, which, in solid state, suffers a change in colour from blue to pink-white in ...
    • Radio characterization for ISM 2.4 GHz wireless sensor networks for judo monitoring applications 

      López Iturri, Peio Upna; Aguirre Gallego, Erik Upna; Azpilicueta Fernández de las Heras, Leyre Upna; Astrain Escola, José Javier Upna; Villadangos Alonso, Jesús Upna; Falcone Lanas, Francisco Javier Upna (MDPI, 2014)   Artículo / Artikulua  OpenAccess
      In this work, the characterization of the radio channel for ISM 2.4GHz Wireless Sensor Networks (WSNs) for judo applications is presented. The environments where judo activity is held are usually complex indoor scenarios ...
    • Real-time simulation technique of a microgrid model for DER penetration 

      Mentesidi, Konstantina; Rikos, Evangelos; Kleftakis, Vasilis; Kotsampopoulos, Panos; Aguado Alonso, Mónica Upna (EAI, 2014)   Artículo / Artikulua  OpenAccess
      Comprehensive analysis of Distributed Energy Resources (DER) integration requires tools that provide computational power and flexibility. In this context, throughout this paper PHIL simulations are performed to emulate the ...
    • Recent developments in fiber optics humidity sensors 

      Ascorbe Muruzabal, Joaquín Upna; Corres Sanz, Jesús María Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      A wide range of applications such as health, human comfort, agriculture, food processing and storage, and electronic manufacturing, among others, require fast and accurate measurement of humidity. Sensors based on optical ...
    • Rectangular waveguide filters with meandered topology 

      Teberio Berdún, Fernando Upna; Percaz Ciriza, Jon Mikel Upna; Arregui Padilla, Iván Upna; Martín Iglesias, Petronilo; Lopetegui Beregaña, José María Upna; Gómez Laso, Miguel Ángel Upna; Arnedo Gil, Israel Upna (IEEE, 2018)   Artículo / Artikulua
      In this paper, a new topology for rectangular waveguide bandpass and low-pass filters is presented. A simple, accurate, and robust design technique for these novel meandered waveguide filters is provided. The proposed ...
    • Refractometric sensors based on multimode interference in a thin-film coated singlemode– multimode–single-mode structure with reflection configuration 

      Del Villar, Ignacio Upna; Socorro Leránoz, Abián Bentor Upna; Corres Sanz, Jesús María Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (Optical Society of America, 2014)   Artículo / Artikulua  OpenAccess
      Thin-film coated single-mode–multimode–single-mode (SMS) structures have been analyzed both theoretically and experimentally with the aim of detecting different refractive indices. By adequate selection of the thickness ...
    • Regular and anomalous extraordinary optical transmission at the THz-gap 

      Kuznetsov, Sergei A.; Navarro Cía, Miguel Upna; Kubarev, V. V.; Gelfand, A. V.; Beruete Díaz, Miguel Upna; Campillo, Igor; Sorolla Ayza, Mario Upna (Optical Society of America, 2009)   Artículo / Artikulua  OpenAccess
      In this paper Anomalous Extraordinary Transmission (ET) is reported for s-polarization of low loss doubly periodic subwavelength hole arrays patterned on polypropylene (PP) substrates by conventional contact photolithography ...
    • Remote (250 km) fiber Bragg grating multiplexing system 

      Fernández Vallejo, Montserrat Upna; Rota Rodrigo, Sergio Upna; López-Amo Sáinz, Manuel Upna (MDPI, 2011)   Artículo / Artikulua  OpenAccess
      We propose and demonstrate two ultra-long range fiber Bragg grating (FBG) sensor interrogation systems. In the first approach four FBGs are located 200 km from the monitoring station and a signal to noise ratio of 20 dB ...
    • Remote-time division multiplexing of bending sensors using a broadband light source 

      Bravo Acha, Mikel Upna; López-Amo Sáinz, Manuel Upna (Hindawi Publishing Corporation, 2012)   Artículo / Artikulua  OpenAccess
      This work experimentally demonstrates a remote sensing network which interrogates bending sensors using time-division multiplexing techniques and a broadband light source. The bending sensors are located 50 km away from ...