Journal papers

2025

  1. J. Parra, J. Navarro-Arenas, and P. Sanchis, “Sub-milliwatt threshold power and tunable-bias all-optical nonlinear activation function using vanadium dioxide for wavelength-division multiplexing photonic neural networks,” Sci Rep, vol. 15, no. 1, p. 5608, Feb. 2025, doi: 10.1038/s41598-025-90350-3.
  2. J. Parra, “Polarization-Insensitive Silicon Grating Couplers via Subwavelength Metamaterials and Metaheuristic Optimization,” Photonics, vol. 12, no. 5, Art. no. 5, May 2025, doi: 10.3390/photonics12050428.
  3. J. Navarro-Arenas, T. M. Howe, J. Parra, D. C. Koutsogeorgis, J. A. Hillier, N. Kalfagiannis, and P. Sanchis, “Local Tuning of the Epsilon-Near-Zero Condition in Hybrid Silicon Waveguides Using Reactive Laser Annealing,” Advanced Photonics Research, vol. 6, no. 6, p. 2400140, 2025, doi: 10.1002/adpr.202400140.

2024

  1. J. J. Seoane, J. Parra, J. Navarro-Arenas, M. Recaman, K. Schouteden, J. P. Locquet, and P. Sanchis, “Ultra-high endurance silicon photonic memory using vanadium dioxide,” npj Nanophoton., vol. 1, no. 1, p. 37, Sep. 2024, doi: 10.1038/s44310-024-00038-1.
  2. J. Parra, J. Navarro-Arenas, and P. Sanchis, “Silicon thermo-optic phase shifters: a review of configurations and optimization strategies,” Advanced Photonics Nexus, vol. 3, no. 4, p. 044001, May 2024, doi: 10.1117/1.APN.3.4.044001.
  3. J. Parra, M. Kovylina, A. Griol, and P. Sanchis, “Nonvolatile reconfigurable polarization rotator at datacom wavelengths based on a Sb2Se3/Si waveguide,” Opt. Express, vol. 32, no. 23, pp. 40581–40592, Nov. 2024, doi: 10.1364/OE.537225.
  4. J.-F. Morcillo, P. Sanchis, and J. Parra, “On-chip electro-optical spiking VO2/Si device with an inhibitory leaky integrate-and-fire response,” Opt. Mater. Express, vol. 14, no. 11, pp. 2681–2693, Nov. 2024, doi: 10.1364/OME.537717.

2023

  1. J. J. Seoane, J. Parra, J. Navarro-Arenas, and P. Sanchis, “Enhanced BaTiO3/Si3N4 integrated photonic platform with VO2 technology for large-scale neuromorphic computing [Invited],” Opt. Mater. Express, vol. 13, no. 11, pp. 3266–3276, Nov. 2023, doi: 10.1364/OME.501920.
  2. J. Navarro-Arenas, J. Parra, and P. Sanchis, “Complex-valued trainable activation function hardware using a TCO/silicon modulator,” Opt. Mater. Express, vol. 13, no. 10, pp. 2869–2881, Oct. 2023, doi: 10.1364/OME.497644.
  3. J. Navarro-Arenas, J. Parra, and P. Sanchis, “Comparative Performance Evaluation of Transparent Conducting Oxides With Different Mobilities for All-Optical Switching in Silicon,” IEEE Journal of Quantum Electronics, vol. 59, no. 3, pp. 1–7, Jun. 2023, doi: 10.1109/JQE.2023.3264774.

2022

  1. J. Parra, J. Navarro-Arenas, M. Kovylina, and P. Sanchis, “Impact of GST thickness on GST-loaded silicon waveguides for optimal optical switching,” Sci Rep, vol. 12, no. 1, p. 9774, Jun. 2022, doi: 10.1038/s41598-022-13848-0.
  2. J. Navarro-Arenas, J. Parra, and P. Sanchis, “Ultrafast all-optical phase switching enabled by epsilon-near-zero materials in silicon,” Opt. Express, vol. 30, no. 9, pp. 14518–14529, Apr. 2022, doi: 10.1364/OE.454181.
  3. B. Chmielak, S. Suckow, J. Parra, V. C. Duarte, T. Mengual, M. A. Piqueras, A. L. Giesecke, M. C. Lemme, and P. Sanchis, “High-efficiency grating coupler for an ultralow-loss Si3N4-based platform,” Opt. Lett., vol. 47, no. 10, pp. 2498–2501, May 2022, doi: 10.1364/OL.455078.

2021

  1. J. Parra, W. H. P. Pernice, and P. Sanchis, “All-optical phase control in nanophotonic silicon waveguides with epsilon-near-zero nanoheaters,” Sci Rep, vol. 11, no. 1, p. 9474, May 2021, doi: 10.1038/s41598-021-88865-6.
  2. J. Parra, I. Olivares, A. Brimont, and P. Sanchis, “Toward Nonvolatile Switching in Silicon Photonic Devices,” Laser & Photonics Reviews, vol. 15, no. 6, p. 2000501, 2021, doi: 10.1002/lpor.202000501.
  3. J. Parra, J. Navarro-Arenas, M. Menghini, M. Recaman, J. Pierre-Locquet, and P. Sanchis, “Low-threshold power and tunable integrated optical limiter based on an ultracompact VO2/Si waveguide,” APL Photonics, vol. 6, no. 12, p. 121301, Dec. 2021, doi: 10.1063/5.0071395.
  4. J. Parra, T. Ivanova, M. Menghini, P. Homm, J.-P. Locquet, and P. Sanchis, “All-Optical Hybrid VO₂/Si Waveguide Absorption Switch at Telecommunication Wavelengths,” Journal of Lightwave Technology, vol. 39, no. 9, pp. 2888–2894, May 2021, doi: 10.1109/JLT.2021.3054942.
  5. I. Olivares, J. Parra, and P. Sanchis, “Non-Volatile Photonic Memory Based on a SAHAS Configuration,” IEEE Photonics Journal, vol. 13, no. 2, pp. 1–8, Apr. 2021, doi: 10.1109/JPHOT.2021.3060144.

2020

  1. J. Parra, I. Olivares, F. Ramos, and P. Sanchis, “Ultra-compact non-volatile Mach–Zehnder switch enabled by a high-mobility transparent conducting oxide,” Opt. Lett., vol. 45, no. 6, pp. 1503–1506, Mar. 2020, doi: 10.1364/OL.388363.
  2. J. Parra, J. Hurtado, A. Griol, and P. Sanchis, “Ultra-low loss hybrid ITO/Si thermo-optic phase shifter with optimized power consumption,” Opt. Express, vol. 28, no. 7, pp. 9393–9404, Mar. 2020, doi: 10.1364/OE.386959.
  3. S. Cueff, J. John, Z. Zhang, J. Parra, J. Sun, R. Orobtchouk, S. Ramanathan, and P. Sanchis, “VO2 nanophotonics,” APL Photonics, vol. 5, no. 11, p. 110901, Nov. 2020, doi: 10.1063/5.0028093.

2019

  1. J. Parra, I. Olivares, A. Brimont, and P. Sanchis, “Non-volatile epsilon-near-zero readout memory,” Opt. Lett., vol. 44, no. 16, pp. 3932–3935, Aug. 2019, doi: 10.1364/OL.44.003932.
  2. I. Olivares, J. Parra, A. Brimont, and P. Sanchis, “Enhancing Pockels effect in strained silicon waveguides,” Opt. Express, vol. 27, no. 19, pp. 26882–26892, Sep. 2019, doi: 10.1364/OE.27.026882.

2018

  1. L. D. Sánchez, I. Olivares, J. Parra, M. Menghini, P. Homm, J.-P. Locquet, and P. Sanchis, “Experimental demonstration of a tunable transverse electric pass polarizer based on hybrid VO2/silicon technology,” Opt. Lett., vol. 43, no. 15, pp. 3650–3653, Aug. 2018, doi: 10.1364/OL.43.003650.
  2. I. Olivares, L. Sánchez, J. Parra, R. Larrea, A. Griol, M. Menghini, P. Homm, L.-W. Jang, B. van Bilzen, J. W. Seo, J.-P. Locquet, and P. Sanchis, “Optical switching in hybrid VO2/Si waveguides thermally triggered by lateral microheaters,” Opt. Express, vol. 26, no. 10, pp. 12387–12395, May 2018, doi: 10.1364/OE.26.012387.