• 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 ...
    • Colorless devices and reception techniques for polarization multiplexed communications 

      Halir, Robert; Reyes-Iglesias, Pedro; Alonso-Ramos, C.; Sarmiento-Merenguel, Darío; Wanguemert-Perez, Juan Gonzalo; [et al.] (2015-06-29)
      Future optical networks call for flexible, high performance and low cost coherent optical receivers. We present here several advances towards such receivers, including integrated optical couplers with ultra-broad bandwidth, as ...
    • Comparing the fundamental limit of detection for interferometric and resonant biosensors with coherent phase read-out 

      Leuermann, Jonas; Molina-Fernández, Íñigo; Ortega-Moñux, Alejandro; Wanguemert-Perez, Juan Gonzalo; Halir, Robert (2019-06-27)
      We compare the limit of detection of coherently interrograted photonic biosensors, using both interferometric and resonant architectures.
    • Design of arbitrary optical filters in silicon-on-insulator using evanescently-coupled Bragg gratings 

      Pereira-Martín, Daniel; Ortega-Moñux, Alejandro; Molina-Fernández, Íñigo; 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-Fernández, Íñigo; 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 filtros ópticos integrados con respuesta espectral arbitraria en tecnología de silicio sobre aislante 

      Pereira-Martín, Daniel; Wangüemert-Pérez, J. Gonzalo; Molina-Fernández, Íñigo; 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-Fernández, Íñigo; 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 ...
    • 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 ...
    • Enhanced sensitivity subwavelength grating waveguides for silicon photonics sensing applications 

      Wanguemert Perez, J. 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 ...
    • Estudio comparativo de biosensors coherentes basados en estructuras interferométricas y resonantes 

      Molina Fernandez, Iñigo; Leuerman, Jonas; Ortega-Moñux, Alejandro; Wanguemert-Perez, Juan Gonzalo; Halir, Robert (2019-06-18)
      La gran mayoría de los biosensores fotónicos de campo evanescente se basan en arquitecturas interferométricas o resonantes. La determinación analítica del límite de detección (LOD) alcanzable con estas arquitecturas es muy ...
    • 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 ...
    • High performance silicon photonic devices based on practical metamaterials 

      Halir, Robert; Luque-González, Jose Manuel; Sánchez-Postigo, Alejandro; Herrero-Bermello, Alaine; González-Andrade, David; [et al.] (2019-07-15)
      Subwavelength grating metamaterials are enabling a new generation of high-performance silicon photonic devices. Here we discuss the fundamental physics along with some of the latest advances in this rapidly expanding field.
    • Mid-infrared Suspended Waveguide Platform and Building Blocks 

      Wanguemert-Perez, Juan Gonzalo; Sánchez-Postigo, Alejandro; Soler-Penades, Jordi; Ortega-Moñux, Alejandro; Nedeljkovic, Milos; [et al.] (2018-06-05)
      In this work we present our recent progress in the development of a platform for the mid-infrared wavelength range, based on suspended silicon waveguide with subwavelength metamaterial cladding. The platform has some ...
    • Silicon high performance devices using subwavelength structures 

      Halir, Robert; Sánchez-Postigo, Alejandro; Luque-González, José; Herrero-Bermello, Alaine; Leuermann, Jonas; [et al.] (2019-03-13)
      Silicon photonics is poised to solve challenges in areas such as datacom, environmental monitoring and diagnostics, by leveraging the economies of scale afforded by CMOS manufacturing. This requires a wide variety of ...
    • Subwavelength Index Engineering for SOI Waveguides 

      Halir, Robert; Luque-González, J.M.; Wang, S.; Sarmiento-Merenguel, Jose Darío; Sánchez-Postigo, A.; [et al.] (2016-09-06)
      Photonic structures with a sub-wavelength pitch, small enough to suppress diffraction, can behave as equivalent homogenous materials that can be engineered to exhibit a specific refractive index and dispersion. Here we ...
    • Subwavelength metamaterial engineering for silicon photonics 

      Halir, Robert; Ortega-Moñux, Alejandro; Soler-Penades, Jordi; Luque-González, Jose Manuel; Sarmiento-Merenguel, Darío; [et al.] (2017-02-06)
      Waveguides structured at the subwavelength scale frustrate di raction and behave as optical metamaterials with controllable refractive index. These structures have found widespread applications in silicon photonics, ranging ...