• A general approach for robust integrated polarization rotators 

      Alonso-Ramos, C.; Halir, Robert; Ortega-Moñux, Alejandro; Cheben, Pavel; Vivien, Laurent; [et al.] (International Society for Optics and Photonics, 2013)
      Integrated polarization rotators suffer from very high sensitivity to fabrication errors. A polarization rotator scheme that substantially increases fabrication tolerances is proposed. In the proposed scheme, two tunable ...
    • Automatic design of high-performance fiber-chip surface grating couplers based on Floquet-Bloch mode analysis 

      Sánchez Postigo, Alejandro; Xu, Dan-Xia; Hadij-Elhouati, Abdelfettah; Molina-Fernandez, Iñigo; Ortega-Moñux, Alejandro; [et al.] (2018-04-30)
      We propose a new strategy to automatically design highly efficient fiber-chip surface grating couplers. High performance designs are achieved with a substantially reduced computational cost by combining Floquet-Bloch mode ...
    • Bricked subwavelength structures: a flexible metamaterial topology 

      Luque-González, José Manuel; Ortega-Moñux, Alejandro; Halir, Robert; Molina-Fernández, Íñigo; Wanguemert-Perez, Juan Gonzalo; [et al.] (2021)
      Subwavelength gratings (SWG) are periodic structures that synthesize lithography tailorable metamaterials with desired permittivity, dispersion, and anisotropy, enabling the design of a myriad of high-performance devices. ...
    • Building high-performance integrated optical devices using subwavelength grating metamaterials 

      Sánchez-Postigo, Alejandro; Ginel-Moreno, Pablo; Ortega-Moñux, Alejandro; Wanguemert-Perez, Juan Gonzalo; Halir, Robert; [et al.] (2021-09)
      The use of subwavelength grating structures in silicon waveguides have fuelled the development of integrated optical components with superior performance. By a judicious lithographic pattern of the grating, the optical ...
    • Curved waveguide grating demultiplexer (CWG) with a flattened response via bimodal output waveguides 

      Hadij ElHouati, Abdel; Halir, Robert; Ortega-Moñux, Alejandro; Wanguemert-Perez, Juan Gonzalo; Schmid, J.H.; [et al.] (2022-05-08)
      We demonstrate a compact wavelength demultiplexer for the silicon-on-insulator platform based on the curved waveguide grating (CWG) architecture. The proposed device uses bi- modal output waveguides to achieve a low-loss ...
    • Customized spectral filters using cladding-modulated Bragg gratings in silicon waveguides. 

      Pereira-Martín, Daniel; Ortega-Moñux, Alejandro; Luque-González, José Manuel; Hadij-ElHouati, Abdelfettah; Sánchez-Postigo, Alejandro; [et al.] (European Optical Society Annual Meeting (EOSAM) 2021., 2021-09-13)
      Waveguide Bragg gratings are expected to play an important role in diverse applications of photonic integrated circuits. Here, we present our latest progress in implementing Bragg filters with a customized spectral response ...
    • Design of arbitrary optical filters in silicon-on-insulator using evanescently-coupled Bragg gratings 

      Pereira-Martín, Daniel; Ortega-Moñux, Alejandro; Molina-Fernandez, Iñigo; Luque-González, José Manuel; Cheben, Pavel; [et al.] (2019-07-10)
      Spectral filters are experiencing an increasing demand in several applications of the silicon- on-insulator (SOI) platform. Many works have demonstrated that arbitrary frequency responses can be synthesized by apodizing ...
    • Design of subwavelength grating metamaterial waveguides for communications and sensing applications 

      Ortega-Moñux, Alejandro; Luque-González, José Manuel; Pereira Martín, Daniel; Sánchez Postigo, Alejandro; Hadij ElHouati, Abdel; [et al.] (2019-07-04)
      In this work we will cover some of our recent advances in the design of state-of-the-art silicon photonic devices based on all-dielectric subwavelength grating (SWG) metamaterials. Specifically, we will focus on the design ...
    • Designing anisotropy with waveguide subwavelength structures 

      Herrero-Bermello, Alaine; Velasco, Aitor; Schmid, Jens; Cheben, Pavel; Halir, Robert; [et al.] (2018-07-12)
      Silicon sub-wavelength structures have become a versatile design tool for practical, high-performance integrated optical devices, ranging from highly efficient grating couplers to ultra-broadband beam-splitters. Recently, ...
    • Designing polarization management devices by tilting subwavelength grating structures 

      Luque-González, José Manuel; Herrero-Bermello, Alaine; Ortega-Moñux, Alejandro; Molina-Fernandez, Iñigo; Velasco, Aitor V.; [et al.] (2019-05-03)
      Subwavelength gratings (SWG) are periodic structures which behave as controllable homogeneous metamaterials. SWGs are extremely interesting when they are used in platforms with a limited choice of material refractive indices, ...
    • Diffractive sidewall grating coupler: towards 2D free-space optics on chip. 

      Hadij-ElHouati, Abdelfettah; Cheben, Pavel; Ortega-Moñux, Alejandro; Wanguemert-Perez, Juan Gonzalo; Halir, Robert; [et al.] (2019-05-02)
      Silicon photonics has been the subject of intense research efforts. In order to implement complex integrated silicon photonic devices and systems, a wide range of robust building blocks is needed. Waveguide couplers are ...
    • Diseño de antena óptica integrada de haz estrecho en tecnología silicon-on-insulator 

      Ortega-Moñux, Alejandro; Pereira-Martín, Daniel; Hadij-ElHouati, Abdelfettah; Ye, Winnie N.; Melati, Daniele; [et al.] (2021-07)
      Las antenas ópticas acopladas en fase son un elemento clave en sistemas de Light Detection and Ranging (LIDAR) integrados, en los que se necesita emitir un haz óptico con ancho angular estrecho en un amplio número de ...
    • Diseño de filtros ópticos integrados con respuesta espectral arbitraria en tecnología de silicio sobre aislante 

      Pereira-Martín, Daniel; Wanguemert-Perez, Juan Gonzalo; Molina-Fernandez, Iñigo; Cheben, Pavel; Schmid, Jens H.; [et al.] (2019-09-10)
      Silicon photonics is one of the most promising technologies nowadays, with myriads of potential applications in communications and sensing. Many of these applications require spectral filters synthesizing arbitrary frequency ...
    • Diseño de grating couplers de orden cero de banda ancha y alta eficiencia para el infrarrojo medio 

      Sánchez-Postigo, Alejandro; Wanguemert-Perez, Juan Gonzalo; Luque-Gonzaléz, José Manuel; Molina-Fernandez, Iñigo; Cheben, Pavel; [et al.] (2017-09-27)
      The mode fields of optical fibers and high-index contrast photonic waveguides have different dimensions, making difficult the coupling of light from one to the other. To solve this problem, surface grating couplers are one ...
    • Dispositivos de interferencia multimodal 2×2 de banda ultraancha basados en estructuras periódicas sub-longitud de onda para las bandas O-E-S-C 

      Pérez-Armenta, Carlos; Ortega-Moñux, Alejandro; Luque-González, José Manuel; Halir, Robert; Schmid, Jens H.; [et al.] (2021)
      Los dispositivos de interferencia multimodal (MMI) son un bloque funcional fundamental en óptica integrada. La creciente demanda de capacidad en los enlaces de comunicaciones ópticas motiva la búsqueda de nuevas formas de ...
    • Engineering sub-wavelength silicon waveguides for sensing applications in the near-infrared and mid-infrared band 

      Wanguemert-Perez, Juan Gonzalo; Sánchez-Postigo, Alejandro; Hadij-ElHouati, Abdelfettah; Leuermann, Jonas; Pérez-Armenta, Carlos; [et al.] (2019-02-08)
      Silicon photonics is one of the most promising candidates to achieve lab-on-a-chip systems. Making use of the evanescent-field sensing principle, it is possible to determine the presence and concentration of substances by ...
    • Engineering the optical properties of silicon using sub-wavelength structures 

      Halir, Robert; Ortega-Moñux, Alejandro; Maese-Novo, Alejandro; Pérez-Galacho, Diego; Zavargo-Peche, Luis; [et al.] (IEEE Photonics Society, 2013)
      In most integrated optics platforms, including silicon-on-insulator, only minor modifications in refractive index are possible. The geometry of the waveguiding structure is thus the only degree of freedom for the design ...
    • Enhanced sensitivity subwavelength grating waveguides for silicon photonics sensing applications 

      Wanguemert-Perez, Juan Gonzalo; Hadij-El-Houati, Abdelfettah; Sanchez-Postigo, Alejandro; Leuermann, Jonas; Pereira-Martín, Daniel; [et al.] (2019-07-16)
      In this work we will review the enormous potential of subwavelength grating waveguides for sensing applications in the near and mid-infrared bands, demonstrating the capability to engineer the mode profile to maximize the ...
    • Estructuras sub-longutud de onda para el diseño de dispositivos en guía dieléctrica 

      Ortega-Moñux, Alejandro; Wanguemert-Perez, Juan Gonzalo; Halir, Robert; Cheben, Pavel; Godoy-Rubio, Rafael; [et al.] (Juan Córcoles Ortega et al., 2016)
      Sub-wavelength structures are enabling the design of devices based in dielectric waveguides with unprecedented performance in both the near-infrared and mid-infrared wavelength regions. These devices include fiber-to-chip ...
    • High performance and small footprint spot size converters based on SWG metamaterial lenses 

      Luque-González, José Manuel; Molina-Fernandez, Iñigo; Ortega-Moñux, Alejandro; Halir, Robert; Schmid, Jens H.; [et al.] (2018-06-28)
      Spot size converters with high expansion ratio are required in a variety of situations. This is the case of non-focusing Silicon on Insulator (SOI) fiber-to-chip grating couplers, which typically require long adiabatic ...