• 77-GHz high-gain bull’s-eye antenna with sinusoidal profile 

      Beaskoetxea Gartzia, Unai Upna; Pacheco Peña, Víctor Upna; Orazbayev, Bakhtiyar Upna; Akalin, Tahsin; Maci, Stefano; Navarro Cía, Miguel Upna (IEEE, 2015)   Artículo / Artikulua  OpenAccess
      A high-gain Bull’s-Eye leaky-wave horn antenna working at 77 GHz with sinusoidal profile has been designed, fabricated, and experimentally measured. The influence of the number of periods on the gain and beamwidth is ...
    • All-dielectric periodic terajet waveguide using an array of coupled cuboids 

      Minin, Igor V.; Minin, Oleg V.; Pacheco Peña, Víctor Upna; Beruete Díaz, Miguel Upna (AIP Publishing, 2015)   Artículo / Artikulua  OpenAccess
      In this paper, the recently proposed technique to produce photonic jets (terajets at terahertz (THz) frequencies) using 3D dielectric cuboids is applied in the design of a mesoscale cuboid-chain wave- guide. The chains are ...
    • All-metallic ε-near-zero (ENZ) lens based on ultra-narrow hollow rectangular waveguides: experimental results 

      Orazbayev, Bakhtiyar Upna; Torres Landívar, Víctor Upna; Pacheco Peña, Víctor Upna; Falcone Lanas, Francisco Javier Upna; Teniente Vallinas, Jorge Upna; Beruete Díaz, Miguel Upna; Sorolla Ayza, Mario Upna; Navarro Cía, Miguel Upna; Engheta, Nader (IEEE, 2014)   Contribución a congreso / Biltzarrerako ekarpena  OpenAccess
      Here we perform numerical and experimental investigation of plano-concave all-metallic ε-near-zero (ENZ) lens with operational frequency f = 144 GHz. The ENZ lens is achieved by stacking an array of narrow hollow rectangular ...
    • Description of bow-tie nanoantennas excited by localized emitters using conformal transformation 

      Pacheco Peña, Víctor Upna; Beruete Díaz, Miguel Upna; Fernández Domínguez, Antonio I.; Luo, Yu; Navarro Cía, Miguel Upna (American Chemical Society, 2016)   Artículo / Artikulua  OpenAccess
      The unprecedented advance experienced by nano- fabrication techniques and plasmonics research over the past few years has made possible the realization of nanophotonic systems entering into the so-called strong coupling ...
    • Doubling the propagation distance of surface plasmon polaritons 

      Pacheco Peña, Víctor Upna; Minin, Igor V.; Minin, Oleg V.; Beruete Díaz, Miguel Upna (SPIE, 2016)   Artículo / Artikulua  OpenAccess
      A novel passive repeater, based on a chain of 3D dielectric particles, has been proposed and numerically simulated.
    • Epsilon-near-zero metalenses operating in the visible 

      Pacheco Peña, Víctor Upna; Navarro Cía, Miguel Upna; Beruete Díaz, Miguel Upna (Elsevier, 2016)   Artículo / Artikulua  OpenAccess
      Several converging lenses working in the permittivity near to zero (ENZ) regime at optical frequencies are designed using an array of metal-dielectric-metal plasmonic waveguides. These plasmonic waveguides show a dispersive ...
    • Experimental realization of an epsilon-near-zero graded-index metalens at terahertz frequencies 

      Pacheco Peña, Víctor Upna; Engheta, Nader; Kuznetsov, Sergei A.; Gentselev, Alexandr; Beruete Díaz, Miguel Upna (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 ...
    • Extraordinary THz transmission with a small beam spot: the leaky wave mechanism 

      Navarro Cía, Miguel Upna; Pacheco Peña, Víctor Upna; Kuznetsov, Sergei A.; Beruete Díaz, Miguel Upna (Wiley, 2018)   Artículo / Artikulua
      The discovery of extraordinary optical transmission (EOT) through patterned metallic foils in the late 1990s was decisive for the development of plasmonics and cleared the path to employ small apertures for a variety of ...
    • Increasing surface plasmons propagation via photonic nanojets with periodically spaced 3D dielectric cuboids 

      Pacheco Peña, Víctor Upna; Minin, Igor V.; Minin, Oleg V.; Beruete Díaz, Miguel Upna (MDPI, 2016)   Artículo / Artikulua  OpenAccess
      A structure based on periodically arranged 3D dielectric cuboids connected by photonic nanojets (PNJs) is proposed with the aim of increasing the propagation distance of surface plasmon polaritons (SPPs) at the telecom ...
    • 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 ...
    • 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 ...
    • Metamaterials and plasmonics applied to devices based on periodic structures at high frequencies: microwaves, terahertz and optical range 

      Pacheco Peña, Víctor Upna (2016)   Tesis doctoral / Doktoretza tesia  OpenAccess
      Esta tesis muestra el trabajo de investigación desarollado bajo el programa de doctorado “tecnología de las comunicaciones” de la Universidad Pública de Navarra (UPNA), para el grado de Doctor (PhD) en Ingenieria de ...
    • Multifrequency focusing and wide angular scanning of terajets 

      Pacheco Peña, Víctor Upna; Beruete Díaz, Miguel Upna; Minin, Igor V.; Minin, Oleg V. (Optical Society of America, 2015)   Artículo / Artikulua  OpenAccess
      In the past, it has been demonstrated that it is possible to produce terajets with high resolution at its focus using 3D dielectric cuboids under plane-wave illumination. Here, a systematic study of the harmonic and angular ...
    • On the performance of the zoned fishnet metamaterial lens with positive and negative reference phase 

      Pacheco Peña, Víctor Upna; Minin, Igor V.; Minin, Oleg V.; Beruete Díaz, Miguel Upna (IEEE, 2016)   Artículo / Artikulua  OpenAccess
      In this letter, several converging fishnet metalenses are designed using both the zoning and reference phase techniques. They are engineered with a focal length of 1.5λ0 at the design frequency of 55 GHz (λ0 = 5.45 mm) at ...
    • Phase reversal technique applied to fishnet metalenses 

      Pacheco-Peña, Víctor Upna; Minin, Igor V.; Minin, Oleg V.; Beruete Díaz, Miguel Upna (Hindawi, 2018)   Artículo / Artikulua  OpenAccess
      In this work, the fishnet metamaterial is applied to several converging metalenses by combining the zoning, reference phase, and phase reversal techniques. First, the zoning and reference phase techniques are implemented ...
    • Soret fishnet metalens antenna 

      Orazbayev, Bakhtiyar Upna; Beruete Díaz, Miguel Upna; Pacheco Peña, Víctor Upna; Crespo López, Gonzalo; Teniente Vallinas, Jorge Upna; Navarro Cía, Miguel Upna (Springer Nature, 2015)   Artículo / Artikulua  OpenAccess
      At the expense of frequency narrowing, binary amplitude-only diffractive optical elements emulate refractive lenses without the need of large profiles. Unfortunately, they also present larger Fresnel reflection loss ...
    • Steering surface plasmons with a graded index dielectric medium 

      Beruete Díaz, Miguel Upna; Pacheco-Peña, Víctor Upna (IOP Publishing, 2018)   Artículo / Artikulua
      The arbitrary control of surface plasmon (SP) propagation has become an intense research topic for several decades. This is due to the fact that they can be used in a variety of fields such as optical trapping, nanoantennas ...
    • Super-oscillatory metalens at terahertz for enhanced focusing with reduced side lobes 

      Legaria Lerga, Santiago; Pacheco-Peña, Víctor Upna; Beruete Díaz, Miguel (MDPI, 2018)   Artículo / Artikulua  OpenAccess
      In this paper, we design and numerically demonstrate an ultra-thin super-oscillatory metalens with a resolution below the diffraction limit. The zones of the lens are implemented using metasurface concepts with hexagonal ...
    • Terahertz epsilon-near-zero graded-index lens 

      Torres Landívar, Víctor Upna; Pacheco-Peña, Víctor Upna; Rodríguez Ulibarri, Pablo Upna; Navarro Cía, Miguel Upna; Beruete Díaz, Miguel Upna; Sorolla Ayza, Mario Upna; Engheta, Nader (Optical Society of America, 2013)   Artículo / Artikulua  OpenAccess
      An epsilon-near-zero graded-index converging lens with planar faces is proposed and analyzed. Each perfectly-electric conducting (PEC) waveguide comprising the lens operates slightly above its cut-off frequency and has ...
    • Terajets produced by dielectric cuboids 

      Pacheco Peña, Víctor Upna; Beruete Díaz, Miguel Upna; Minin, Igor V.; Minin, Oleg V. (AIP Publishing, 2014)   Artículo / Artikulua  OpenAccess
      The capability of generating terajets using three-dimensional (3D) dielectric cuboids working at terahertz (THZ) frequencies (as analogues of nanojets in the infrared band) is introduced and studied numerically. The focusing ...