García Rupérez, Jaime
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- PublicationReal-Time and Low-Cost Sensing Technique Based on Photonic Bandgap Structures(Optical Society of America, 2011) García Castelló, Javier; Toccafondo, Veronica; Pérez Millán, Pedro; Sánchez Losilla, Nuria; Cruz, J. L.; Andres, M. V.; García Rupérez, Jaime; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; Ministerio de Ciencia e Innovación; Generalitat Valenciana; Universitat Politècnica de València[EN] A technique for the development of low-cost and high-sensitivity photonic biosensing devices is proposed and experimentally demonstrated. In this technique, a photonic bandgap structure is used as transducer, but its readout is performed by simply using a broadband source, an optical filter, and a power meter, without the need of obtaining the transmission spectrum of the structure; thus, a really low-cost system and real-time results are achieved. Experimental results show that it is possible to detect very low refractive index variations, achieving a detection limit below 2 x 10(-6) refractive index units using this low-cost measuring technique. (C) 2011 Optical Society of America[
- PublicationSimultaneous Refractive Index Sensing Using an Array of Suspended Porous Silicon Membranes(Institute of Electrical and Electronics Engineers, 2020-08) Martín-Sánchez, David; Ivanova Angelova, Todora; García Rupérez, Jaime; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; Generalitat Valenciana; Ministerio de Economía y Competitividad[EN] We propose a fast and cost-effective method for obtaining a miniaturized array-formatted sensor suitable for multiplexed detection. Our solution is based on the fabrication of multiple mu m-sized suspended porous silicon (PSi) membranes working as independent transducers. Our process can potentially integrate an array of up to 1000 sensing spots per cm(2). We also propose a simple and user-friendly optical platform to simultaneously interrogate each element of the array in real-time. The feasibility of this idea was proved performing several sensing experiments where we were able to detect refractive index (RI) variations with different transducers at the same time. An average experimental sensitivity of 685 nm/RIU (Refractive Index Unit) was achieved, with a theoretical limit of detection (LoD) of 2.10(-4) RIU. The analyzed sensing spots displayed similar behavior both in time and in magnitude. We believe that the high capabilities of the sensor presented in this work, along with the sensing mechanism, can be very useful for multi-parametric analysis and multi-target detection of biological samples.
- PublicationExperimental study of the sensitivity of a porous silicon ring resonator sensor using continuous in-flow measurements(The Optical Society, 2017-12-11) Caroselli, Raffaele; Ponce Alcántara, Salvador; Prats-Quílez, Francisco; Martín-Sánchez, David; Torrijos-Morán, Luis; Griol Barres, Amadeu; Bellieres, Laurent Christophe; Bandarenka, Hanna; Girel, Kseniya; Bondarenko, Vitaly; García Rupérez, Jaime; Departamento de Ingeniería Electrónica; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Escuela Técnica Superior de Ingeniería Aeroespacial y Diseño Industrial; Instituto Universitario de Tecnología Nanofotónica; Generalitat Valenciana; Ministerio de Economía, Industria y Competitividad[EN] A highly sensitive photonic sensor based on a porous silicon ring resonator was developed and experimentally characterized. The photonic sensing structure was fabricated by exploiting a porous silicon double layer, where the top layer of a low porosity was used to form photonic elements by e-beam lithography and the bottom layer of a high porosity was used to confine light in the vertical direction. The sensing performance of the ring resonator sensor based on porous silicon was compared for the different resonances within the analyzed wavelength range both for transverse-electric and transverse-magnetic polarizations. We determined that a sensitivity up to 439 nm/RIU for low refractive index changes can be achieved depending on the optical field distribution given by each resonance/polarization. (C) 2017 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
- PublicationBimodal waveguide sensors enabled by subwavelength grating structures(OSA (Optical Society), 2020-07-16) Torrijos-Morán, Luis; García Rupérez, Jaime; Griol Barres, Amadeu; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; Generalitat Valenciana[EN] A subwavelength grating sensor based on a bimodal waveguide configuration is presented for continuous in-flow measurements of refractive index variations. An experimental bulk sensitivity of 1350nm/RIU and a limit of detection of 2x10-5RIU is obtained in a single-channel refractive index sensor.
- PublicationMacropore Formation and Pore Morphology Characterization of Heavily Doped p-Type Porous Silicon(The Electrochemical Society, 2019-01-03) Martín-Sánchez, David; Ponce Alcántara, Salvador; Martinez-Perez, Paula; García Rupérez, Jaime; Departamento de Ingeniería Electrónica; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Escuela Técnica Superior de Ingeniería Aeroespacial y Diseño Industrial; Instituto Universitario de Tecnología Nanofotónica; Ministerio de Economía y Competitividad[EN] Tuning the pore diameter of porous silicon films is essential for some applications such as biosensing, where the pore size can be used for filtering analytes or to control the biofunctionalization of its walls. However, macropore (>50nm) formation on p-type silicon is not yet fully controlled due to its strong dependence on resistivity. Electrochemical etching of heavily doped p-type silicon usually forms micropores (<5nm), but it has been found that bigger sizes can be achieved by adding an organic solvent to the electrolyte. In this work, we compare the results obtained when adding dimethylformamide (DMF) and dimethylsulfoxide (DMSO) to the electrolyte as well as the effect of a post-treatment of the sample with potasium hydroxide (KOH) and sodium hydroxide (NaOH) for macropore formation in p-type silicon with resistivities between 0.001 and 10ohm· cm, achieving pore sizes from 5 to 100nm.
- PublicationThiol ene click chemistry towards easy microarraying of half-antibodies(The Royal Society of Chemistry, 2018) Alonso Ruiz, Rafael; Jimenez-Meneses, P.; García Rupérez, Jaime; Bañuls Polo, María José; Maquieira Catala, Ángel; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Departamento de Química; Instituto Universitario de Tecnología Nanofotónica; Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural; Generalitat Valenciana; European Commission; Ministerio de Economía y Competitividad[EN] A UV light-induced thiol-ene coupling reaction (TEC) between half-antibodies (hIgG) and vinyl functionalized glass surfaces was run for biosensing in the microarray format. The accomplished performance improved that obtained with whole antibodies.
- PublicationExperimental study of the evanescent-wave photonic sensors response in presence of molecular beacon conformational changes(John Wiley & Sons, 2018) Ruiz-Tórtola, Ángela; Prats-Quílez, Francisco; Gonzalez-Lucas, Daniel; Bañuls Polo, María José; Maquieira Catala, Ángel; Wheeler, Guy; Dalmay, Tamas; Griol Barres, Amadeu; Hurtado Montañés, Juan; Bohlmann, Helge; Götzen, Reiner; García Rupérez, Jaime; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Departamento de Química; Instituto Universitario de Tecnología Nanofotónica; Instituto Interuniversitario de Investigación de Reconocimiento Molecular y Desarrollo Tecnológico; Escuela Técnica Superior de Ingeniería Agronómica y del Medio Natural; European Commission; Ministerio de Economía y Competitividad[EN] An experimental study of the influence of the conformational change suffered by molecular beacon (MB) probesupon the biorecognition of nucleic acid target oligonucleotides over evanescent wave photonic sensorsis reported. To this end, high sensitivity photonic sensors based on silicon photonic bandgap (PBG) structures were used, where the MB probes were immobilized via their 5 termination. Those MBs incorporate a biotin moiety close to their 3 termination in order to selectively bind a streptavidin molecule to them. The different photonic sensing responses obtained toward the target oligonucleotide detection, when the streptavidin molecule was bound to the MB probes or not, demonstrate the conformational change suffered by the MB upon hybridization, which promotes the displacement of the streptavidin molecule away from the surface of the photonic sensing structure.
- PublicationUltra-compact optical switches using slow light bimodal silicon waveguides(Institute of Electrical and Electronics Engineers, 2021-06-01) Torrijos-Morán, Luis; Brimont, Antoine Christian Jacques; Griol Barres, Amadeu; Sanchis Kilders, Pablo; García Rupérez, Jaime; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; GENERALITAT VALENCIANA; AGENCIA ESTATAL DE INVESTIGACION; European Regional Development Fund[EN] Switches are essential components in several optical applications, in which reduced footprints are highly desirable for mass production of densely integrated circuits at low cost. However, most conventional solutions rely on making long switching structures, thus increasing the final device size. Here, we propose and experimentally demonstrate an ultra-compact 2x2 optical switch based on slow-light-enhanced bimodal interferometry in one-dimensional silicon photonic crystals. By properly designing the band structure, the device exhibits a large group index contrast between the fundamental even mode and a higher order odd mode for TE polarization. Thereby, highly dispersive and broadband bimodal regions for high-performance operation are engineered by exploiting the different symmetry of the modes. Two configurations are considered in the experiments to analyze the dimensions influence on the switching efficiency. As a result, a photonic switch based on a bimodal single-channel interferometer with a footprint of only 63 mu m(2), a power consumption of 19.5 mW and a crosstalk of 15 dB is demonstrated for thermo-optic tunability.
- PublicationSlow light bimodal interferometry in one-dimensional photonic crystal waveguides(Nature Publishing Group, 2021-01-14) Torrijos-Morán, Luis; Griol Barres, Amadeu; García Rupérez, Jaime; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; GENERALITAT VALENCIANA; European Regional Development Fund[EN] Strongly influenced by the advances in the semiconductor industry, the miniaturization and integration of optical circuits into smaller devices has stimulated considerable research efforts in recent decades. Among other structures, integrated interferometers play a prominent role in the development of photonic devices for on-chip applications ranging from optical communication networks to point-of-care analysis instruments. However, it has been a long-standing challenge to design extremely short interferometer schemes, as long interaction lengths are typically required for a complete modulation transition. Several approaches, including novel materials or sophisticated configurations, have been proposed to overcome some of these size limitations but at the expense of increasing fabrication complexity and cost. Here, we demonstrate for the first time slow light bimodal interferometric behaviour in an integrated single-channel one-dimensional photonic crystal. The proposed structure supports two electromagnetic modes of the same polarization that exhibit a large group velocity difference. Specifically, an over 20-fold reduction in the higher-order-mode group velocity is experimentally shown on a straightforward all-dielectric bimodal structure, leading to a remarkable optical path reduction compared to other conventional interferometers. Moreover, we experimentally demonstrate the significant performance improvement provided by the proposed bimodal photonic crystal interferometer in the creation of an ultra-compact optical modulator and a highly sensitive photonic sensor.
- PublicationDesign of slow-light-enhanced bimodal interferometers using dimensionality reduction techniques(The Optical Society, 2021-10-11) Torrijos-Morán, Luis; García Rupérez, Jaime; Escuela Técnica Superior de Ingeniería de Telecomunicación; Departamento de Comunicaciones; Instituto Universitario de Tecnología Nanofotónica; GENERALITAT VALENCIANA; AGENCIA ESTATAL DE INVESTIGACION; European Regional Development Fund[EN] Interferometers usually require long paths for the ever-increasing requirements of high-performance operation, which hinders the miniaturization and integration of photonic circuits into very compact devices. Slow-light based interferometers provide interesting advantages in terms of both compactness and sensitivity, although their optimization is computationally costly and inefficient, due to the large number of parameters to be simultaneously designed. Here we propose the design of slow-light-enhanced bimodal interferometers by using principal component analysis to reduce the high-dimensional design space. A low-dimensional hyperplane containing all optimized designs is provided and investigated for changes in the silicon core and cladding refractive index. As a result, all-dielectric single-channel interferometers as modulators of only 33 mu m(2) footprint and sensors with 19.2 x 10(3) 2 pi rad/RIU.cm sensitivity values are reported and validated by 2 different simulation methods. This work allows the design and optimization of slow light interferometers for different applications by considering several performance criteria, which can be extended to other photonic structures. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement