• Experimental evidence of coherence resonance in a time-delayed bistable system 

      Arizaleta Arteaga, Mikel Upna Orcid; Valencia, Miguel; Sciamanna, Marc; Thienpont, Hugo; López-Amo Sáinz, Manuel Upna Orcid; Panajotov, Krassimir (APS Physics, 2007)   Artículo / Artikulua  OpenAccess
      We report on the experimental observation of coherence resonance in a bistable system with delay. Our system consists of a vertical-cavity surface-emitting laser subject to time-delayed optical feedback simultaneously from ...
    • Experimental optimization in terms of power stability and output power of highly Er-doped fiber lasers with single and hybrid cavities 

      Pérez Herrera, Rosa Ana Upna Orcid; Chen, Shuying; Zhao, Weizhong; Sun, Tong; López-Amo Sáinz, Manuel Upna Orcid (Taylor & Francis, 2010)   Artículo / Artikulua  OpenAccess
      In this article, the output power stability of several different highly erbiumdoped fiber ring lasers, as a function of the laser parameters, is experimentally investigated. The study is focused on the optimization of ...
    • Experimental realization of an epsilon-near-zero graded-index metalens at terahertz frequencies 

      Pacheco-Peña, Víctor Upna Orcid; Engheta, Nader; Kuznetsov, Sergei A.; Gentselev, Alexandr; Beruete Díaz, Miguel Upna Orcid (American Physical Society, 2017)   Artículo / Artikulua  OpenAccess
      The terahertz band has been historically hindered by the lack of efficient generators and detectors, but a series of recent breakthroughs have helped to effectively close the “terahertz gap.” A rapid development of terahertz ...
    • Experimental study and sensing applications of polarization-dependent lossy mode resonances generated by D-shape coated optical fibers 

      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 (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      The fabrication and characterization of an optical fiber refractometer based on Lossy Mode Resonances (LMR) is presented. TiO2/ poly (sodium 4-styrenesulfonate) (PSS) coatings deposited on side-polished D-shaped optical ...
    • Experimental validation of a Ku-band dual circularly polarized metasurface antenna 

      Tellechea Pereda, Amagoia Upna Orcid; Caminita, Francesco; Martini, Enrica; Ederra Urzainqui, Íñigo Upna Orcid; Teniente Vallinas, Jorge Upna Orcid; Iriarte Galarregui, Juan Carlos Upna Orcid; Gonzalo García, Ramón Upna Orcid; 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 ...
    • Exploiting the dispersion of the double-negative-index fishnet metamaterial to create a broadband low-profile metallic lens 

      Orazbayev, Bakhtiyar Upna Orcid; Pacheco-Peña, Víctor Upna Orcid; Beruete Díaz, Miguel Upna Orcid; Navarro Cía, Miguel Upna Orcid (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 ...
    • Extraordinary transmission and left-handed propagation in miniaturized stacks of doubly periodic subwavelength hole arrays 

      Beruete Díaz, Miguel Upna Orcid; Sorolla Ayza, Mario Upna; Navarro Cía, Miguel Upna Orcid; Falcone Lanas, Francisco Javier Upna Orcid; Campillo, Igor; Lomakin, Vitaliy (Optical Society of America, 2007)   Artículo / Artikulua  OpenAccess
      Metallic plates embedded between dielectric slabs and perforated by rectangular arrays of subwavelength holes with a dense periodicity in one of the directions support extraordinary transmission (ET) phenomena, viz. strong ...
    • Fabrication of Bragg gratings on the end facet of standard optical fibers by sputtering the same material 

      Ascorbe Muruzabal, Joaquín Upna Orcid; Corres Sanz, Jesús María Upna Orcid; Del Villar, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      A sputtering process has been applied to deposit quarter-wavelength stacks on the end facet of cleaved optical fibers by using only one sputtering target. Standard multimode optical fibers were used as substrates to fabricate ...
    • Fe-rich ferromagnetic wires for self-sensing materials 

      Liberal Olleta, Íñigo Upna Orcid; Ederra Urzainqui, Íñigo Upna Orcid; Gonzalo García, Ramón Upna Orcid (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 ...
    • Femtomolar detection by nanocoated fiber label-free biosensors 

      Chiavaioli, Francesco; Zubiate Orzanco, Pablo Upna Orcid; Del Villar, Ignacio Upna Orcid; Ruiz Zamarreño, Carlos Upna Orcid; Giannetti, Ambra; Tombelli, Sara; Trono, Cosimo; Arregui San Martín, Francisco Javier Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Baldini, Francesco (ACS, 2018)   Artículo / Artikulua  OpenAccess
      The advent of optical fibre-based biosensors combined with that of nanotechnologies has provided an oppor-tunity for developing in situ, portable, lightweight, versatile and high-performance optical sensing platforms. We ...
    • Fiber cavity ring down and gain amplification effect 

      Silva, Susana; Magalhães, Regina; Pérez Herrera, Rosa Ana Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid; Marques, M. B.; Frazão, Orlando (Springer Nature, 2016)   Artículo / Artikulua  OpenAccess
      The effect of an erbium-doped fiber amplifier (EDFA) placed inside the fiber ring of a cavity ring down (CRD) configuration is studied. The limitations and advantages of this configuration are discussed, and the study of ...
    • A fiber optic ammonia sensor using a universal pH indicator 

      Rodríguez Rodríguez, Adolfo Josué; Ruiz Zamarreño, Carlos Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid; Cruz, René; May Arrioja, Daniel A. (MDPI, 2014)   Artículo / Artikulua  OpenAccess
      A universal pH indicator is used to fabricate a fiber optic ammonia sensor. The advantage of this pH indicator is that it exhibits sensitivity to ammonia over a broad wavelength range. This provides a differential response, ...
    • Fiber optic multiple-wavelength filter based on one dimensional photonic bandgap structures with defects 

      Del Villar, Ignacio Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (IEEE, 2004)   Artículo / Artikulua  OpenAccess
      In this paper, a theoretical analysis is given of an optical fiber multiple-wavelength tunable filter based on a onedimensional (1-D) photonic bandgap (PBG) structure with four defects. To understand the positioning of ...
    • Fiber optic sensor networks 

      Pérez Herrera, Rosa Ana Upna Orcid; López-Amo Sáinz, Manuel Upna Orcid (Elsevier, 2013)   Artículo / Artikulua  OpenAccess
      One of the main goals in fiber optic sensor technology is to multiplex together a high number of sensorsin the same network in order to share expensive terminal equipment and develop a system including multiple measuring ...
    • Fiber-optic nanorefractometer based on one-dimensional photonic-bandgap structures with two defects 

      Del Villar, Ignacio Upna Orcid; Matías Maestro, Ignacio Upna Orcid; Arregui San Martín, Francisco Javier Upna Orcid (IEEE, 2004)   Artículo / Artikulua  OpenAccess
      A theoretical analysis of a fiber-optic photonic- bandgap (PBG)-based nanorefractometer is presented. Changes up to 11.2 dB in the optical output power in an index of refraction range of 1.7 with a sensitivity of 1.5 ...
    • Fisiopatología y técnicas de registro de los movimientos oculares 

      Gila Useros, Luis; Villanueva Larre, Arantxa Upna Orcid; Cabeza Laguna, Rafael Upna Orcid (Gobierno de Navarra, 2009)   Artículo / Artikulua  OpenAccess
      En el control de la motilidad ocular intervienen varios sistemas funcionales. Los reflejos vestíbulo-oculares y optocinéticos son respuestas automáticas para compensar los movimientos de la cabeza y del entorno visual y ...
    • Focus on terahertz plasmonics 

      Rahm, Marco; Nahata, Ajay; Akalin, Tahsin; Beruete Díaz, Miguel Upna Orcid; Sorolla Ayza, Mario Upna (IOP Publishing, 2015)   Artículo / Artikulua  OpenAccess
      Plasmonics is one of the growing fields in modern photonics that has garnered increasing interest over the last few years. In this focus issue, the specific challenges concerning terahertz plasmonics have been addressed ...
    • Frequency modulated continuous wave system for optical fiber intensity sensors with optical amplification 

      Pérez Herrera, Rosa Ana Upna Orcid; Frazão, Orlando; Santos, José Luís; Araújo, Francisco Moita; Ferreira, Luis Alberto; Baptista, José Manuel; López-Amo Sáinz, Manuel Upna Orcid (IEEE, 2009)   Artículo / Artikulua  OpenAccess
      We report on the use of erbium doped fiber (EDF) amplification to enhance a frequency modulated continuous wave (FMCW) technique for referencing optical intensity sensors located between two Bragg grating structures. The ...
    • Frequency selective properties of coaxial transmission lines loaded with combined artificial inclusions 

      Falcone Lanas, Francisco Javier Upna Orcid; Gil Guruceaga, Javier Upna (Hindawi, 2014)   Artículo / Artikulua  OpenAccess
      The properties of a modified coaxial transmission line by periodic inclusions will be discussed. The introduction of split ring resonators, conductor stubs, air gaps, and combination of these gives rise to new frequency ...
    • Frequency-based energy management strategy for stand-alone systems with distributed battery storage 

      Urtasun Erburu, Andoni Upna Orcid; Barrios Rípodas, Ernesto Upna Orcid; Sanchis Gúrpide, Pablo Upna Orcid; Marroyo Palomo, Luis Upna Orcid (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      Distributed generation is an attractive solution for stand-alone AC supply systems. In such systems, the installation of two or more energy-storage units is recommended for system redundancy and may also be required when ...

      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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