Now showing items 140-159 of 298

    • Label-free wavelength and phase detection based SMS fiber immunosensors optimized with cladding etching 

      Cardona-Maya, Yamile; Socorro Leránoz, Abián Bentor Upna; Del Villar, Ignacio Upna; Cruz, José Luis; Corres Sanz, Jesús María Upna; Botero-Cadavid, Juan F. (Elsevier, 2018)   Artículo / Artikulua
      The performance of E-SMS (Etched Singlemode-Multimode-Singlemode) optical fiber structures as immunosensors has been assessed by the implementation of antibody/antigen immunoassays. Through this procedure it has been ...
    • Least upper bounds of the powers extracted and scattered by bi-anisotropic particles 

      Liberal Olleta, Íñigo Upna; Ra´di, Younes; Gonzalo García, Ramón Upna; Ederra Urzainqui, Íñigo Upna; Tretyakov, Sergei A.; Ziolkowski, Richard W. (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      The least upper bounds of the powers extracted and scattered by bi-anisotropic particles are investigated analytically. A rigorous derivation for particles having invertible polarizability tensors is presented, and the ...
    • Left-handed extraordinary optical transmission through a photonic crystal of subwavelength hole arrays 

      Beruete Díaz, Miguel Upna; Sorolla Ayza, Mario Upna; Campillo, Igor (Optical Society of America, 2006)   Artículo / Artikulua  OpenAccess
      Metamaterial structures are artificial materials that show unconventional electromagnetic properties such as photonic band-gap, extraordinary optical transmission and left-handed propagation. Up to now, relations of photonic ...
    • 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 ...
    • Localized photonic jets from flat, three-dimensional dielectric cuboids in reflection mode 

      Minin, Igor V.; Minin, Oleg V.; Pacheco-Peña, Víctor Upna; Beruete Díaz, Miguel Upna (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
      A photonic jet (a terajet at terahertz frequencies) commonly denotes a specific, spatially localized region in the near field on the front side of a dielectric particle with a diameter comparable with the wavelength ...
    • Long period fiber grating for biosensing: an improved design methodology to enhance add-layer sensitivity 

      Bandyopadhyay, Sankhyabrata; Del Villar, Ignacio Upna; Basumallick, Nandini; Biswas, Palas; Dey, Tanoy Kumar; Bandyopadhyay, Somnath (IEEE, 2018)   Artículo / Artikulua  OpenAccess
      We present our theoretical study on the design of LPFG sensor where its add-layer sensitivity is enhanced. addlayer sensitivity quantifies the sensitivity of the sensor to the changes taking place within few tens of ...
    • 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 ...
    • Long-range hybrid network with point and distributed Brillouin sensors using Raman amplification 

      Zornoza Indart, Ander; Pérez Herrera, Rosa Ana Upna; Elosúa Aguado, César Upna; Díaz Lucas, Silvia Upna; Bariáin Aisa, Cándido Upna; Loayssa Lara, Alayn Upna; López-Amo Sáinz, Manuel Upna (Optical Society of America, 2010)   Artículo / Artikulua  OpenAccess
      We propose a novel concept for hybrid networks that combine point and distributed Brillouin sensors in a cost-effective architecture that also deploys remote distributed Raman amplification to extend the sensing range. A ...
    • Lossy mode resonance generation with indium tin oxide coated optical fibers for sensing applications 

      Del Villar, Ignacio Upna; Ruiz Zamarreño, Carlos Upna; Hernáez Sáenz de Zaitigui, Miguel Upna; Arregui San Martín, Francisco Javier Upna; Matías Maestro, Ignacio Upna (IEEE, 2010)   Artículo / Artikulua  OpenAccess
      Surface plasmon resonances and lossy mode resonances can be generated with Indium Tin Oxide (ITO) coated optical fibers. Both phenomena are analyzed and compared. Lossy mode resonances present important advantages: ...
    • Low-power class-AB CMOS voltage feedback current operational amplifier with tunable gain and bandwidth 

      Esparza Alfaro, Fermín Upna; Pennisi, Salvatore; Palumbo, Gaetano; López Martín, Antonio Upna (IEEE, 2014)   Artículo / Artikulua  OpenAccess
      A CMOS class AB variable gain Voltage Feedback Current Operational Amplifier (VFCOA) is presented. The implementation is based on class AB second generation current conveyors and exploits an electronically tunable ...
    • 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 ...
    • 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 ...
    • Measurement of polarization dependent loss, polarization mode dispersion and group delay of optical components using swept optical single sideband modulated signals 

      Sagüés García, Mikel Upna; Pérez Echegoyen, Miguel; Loayssa Lara, Alayn Upna (Optical Society of America, 2008)   Artículo / Artikulua  OpenAccess
      We introduce a novel method for high wavelength-resolution measurement of polarization-averaged group delay, polarization dependent loss and polarization mode dispersion of optical components using swept optical single ...
    • Mechanical 144GHz beam steering with all-metallic epsilon-near-zero lens antenna 

      Pacheco-Peña, Víctor Upna; Torres Landívar, Víctor Upna; Orazbayev, Bakhtiyar Upna; Beruete Díaz, Miguel Upna; Navarro Cía, Miguel Upna; Sorolla Ayza, Mario Upna; Engheta, Nader (AIP Publishing, 2014)   Artículo / Artikulua  OpenAccess
      An all-metallic steerable beam antenna composed of an ε-near-zero (ENZ) metamaterial lens is experimentally demonstrated at 144 GHz (λ0 = 2.083 mm). The ENZ lens is realized by an array of narrow hollow rectangular waveguides ...
    • A metamaterial T-junction power divider 

      Sáenz Sáinz, Elena Upna; Cantora Álvarez, Alejandro; Ederra Urzainqui, Íñigo Upna; Gonzalo García, Ramón Upna; Maagt, Peter de (IEEE, 2007)   Artículo / Artikulua  OpenAccess
      A metamaterial based compact microstrip T-junction power divider working at 10 GHz is proposed. The metamaterial unit cell consists of microstrip gaps and via holes whose behavior is equivalent to the combination of ...
    • Metasurface-based ultrathin carpet cloaks for millimeter waves 

      Orazbayev, Bakhtiyar Upna; Mohammadi Estakhri, Nasim; Alù, Andrea; Beruete Díaz, Miguel Upna (2017)   Artículo / Artikulua  OpenAccess
      A metasurface carpet cloak for millimetre-wave range with polarization independent performance is experimentally demonstrated. It is shown that the cloak is able to mimic the ground plane by fully restoring the amplitude ...
    • Métodos de procesamiento y análisis de señales electromiográficas 

      Gila Useros, Luis; Malanda Trigueros, Armando Upna; Rodríguez Carreño, Ignacio Upna; Rodríguez Falces, Javier Upna; Navallas Irujo, Javier Upna (Gobierno de Navarra, 2009)   Artículo / Artikulua  OpenAccess
      La electromiografía clínica es una metodología de registro y análisis de la actividad bioeléctrica del músculo esquelético orientada al diagnóstico de las enfermedades neuromusculares. Las posibilidades de aplicación y el ...
    • Micro and nanostructured materials for the development of optical fibre sensors 

      Elosúa Aguado, César Upna; Arregui San Martín, Francisco Javier Upna; Del Villar, Ignacio Upna; Ruiz Zamarreño, Carlos Upna; Corres Sanz, Jesús María Upna; Bariáin Aisa, Cándido Upna; Goicoechea Fernández, Javier Upna; Hernáez Sáenz de Zaitigui, Miguel Upna; Rivero Fuente, Pedro Upna; Socorro Leránoz, Abián Bentor Upna; Urrutia Azcona, Aitor Upna; Sánchez Zábal, Pedro Upna; Zubiate Orzanco, Pablo Upna; López Torres, Diego Upna; Acha Morrás, Nerea de Upna; Ascorbe Muruzabal, Joaquín Upna; Ozcariz Celaya, Aritz Upna; Matías Maestro, Ignacio Upna (MDPI, 2017)   Artículo / Artikulua  OpenAccess
      The measurement of chemical and biomedical parameters can take advantage of the features exclusively offered by optical fibre: passive nature, electromagnetic immunity and chemical stability are some of the most relevant ...
    • Micro-displacement sensor based on a hollow-core photonic crystal fiber 

      Rodrigues Pinto, Ana Margarida Upna; López-Amo Sáinz, Manuel Upna; Baptista, José Manuel; Santos, José Luís; Frazão, Orlando (MDPI, 2012)   Artículo / Artikulua  OpenAccess
      A sensing head based on a hollow-core photonic crystal fiber for in-reflection measurement of micro-displacements is presented. The sensing structure takes advantage of the multimodal behavior of a short segment ...
    • Mid-infrared plasmonic inductors: enhancing inductance with meandering lines 

      Torres Landívar, Víctor Upna; Ortuño Molinero, Rubén Upna; Rodríguez Ulibarri, Pablo Upna; Beruete Díaz, Miguel Upna; Sorolla Ayza, Mario Upna; Griol, Amadeu; Martínez, Alejandro; Navarro Cía, Miguel Upna (Nature Publishing Group, 2014)   Artículo / Artikulua  OpenAccess
      We present a mid-infrared inductor that when applied to an extraordinary transmission hole array produces a strong redshift of the resonant peak accompanied by an unprecedented enlargement of the operation bandwidth. The ...