Papers by Carlos A Barrios
Sensors, Oct 5, 2018
A design study of a nanostructured two-dimensional plasmonic crystal based on aluminum and polyme... more A design study of a nanostructured two-dimensional plasmonic crystal based on aluminum and polymeric material for label-free optical biosensing is presented. The structure is formed of Al nanohole and nanodisk array layers physically separated by a polymeric film. The photonic configuration was analyzed through finite-difference time-domain (FDTD) simulations. The calculated spectral reflectance of the device exhibits a surface plasmon polariton (SPP) resonance feature sensitive to the presence of a modeled biolayer adhered onto the metal surfaces. Simulations also reveal that the Al disks suppress an undesired SPP resonance, improving the device performance in terms of resolution as compared to that of a similar configuration without Al disks. On the basis of manufacturability issues, nanohole diameter and depth were considered as design parameters, and a multi-objective optimization process was employed to determine the optimum dimensional values from both performance and fabrication points of view. The effect of Al oxidation, which is expected to occur in an actual device, was also studied.
Sensors, Sep 16, 2020
Pressure sensitive adhesive (PSA) tapes are a versatile, safe and easy-to-use solution for fasten... more Pressure sensitive adhesive (PSA) tapes are a versatile, safe and easy-to-use solution for fastening, sealing, masking, or joining. They are widely employed in daily life, from domestic use to industrial applications in sectors such as construction and the automotive industry. In recent years, PSA tapes have found a place in the field of micro-and nanotechnology, particularly in contact transfer techniques where they can be used as either sacrificial layers or flexible substrates. As a consequence, various optical sensing configurations based on PSA tapes have been developed. In this paper, recent achievements related to the use of PSA tapes as functional and integral parts of optical sensors are reviewed. These include refractive index sensors, optomechanical sensors and vapor sensors.
Sensors, Jun 14, 2020
In this paper, a compact, integrated, semiconductor-clad strip waveguide label-free biosensor is ... more In this paper, a compact, integrated, semiconductor-clad strip waveguide label-free biosensor is proposed and analyzed. The device is based on CMOS-compatible materials such as amorphous-Si and silicon oxynitride. The optical sensor performance has been modeled by a three-dimensional beam propagation method. The simulations indicate that a 20-µm-long device can exhibit a surface limit of detection of 3 ng/cm 2 for avidin molecules in aqueous solution. The sensor performance compares well to those displayed by other photonic biosensors with much larger footprints. The fabrication tolerances have been also studied in order to analyze the feasibility of the practical implementation of the biosensor.
Sensors, Oct 5, 2016
An optical link, based on a conventional Scotch tape waveguide, for sensing applications requirin... more An optical link, based on a conventional Scotch tape waveguide, for sensing applications requiring rapid on-site assembly is proposed and demonstrated. The flexible waveguide contains an integrated aluminum one-dimensional grating coupler that, when stuck on the radiative surface of a light emitting device, allows light to be coupled in and transmitted through the tape, whose tip end is, in turn, adhered onto the photosensitive surface of a photodetector. The (de)coupling approaches exhibit high alignment tolerances that permit the formation of a free-standing flexible optical connection between surface-normal optoelectronic devices without the need of specialized equipment. As the first demonstration of a sensing application, the proposed optical link is easily configured as a cost-effective intensity-based refractometric sensor for liquid detection, which can be applicable to on-site quality and process control of, for example, beverages.
Plasmonics, Dec 15, 2021
A surface plasmon resonance (SPR) biosensor based on a graphene nanoribbon array in a microfluidi... more A surface plasmon resonance (SPR) biosensor based on a graphene nanoribbon array in a microfluidic flow cell operating in a flow-over format is studied. The optical response of the biosensor is numerically obtained by using rigorous couple wave analysis (RCWA). The performance of the biosensor is described in terms of the limit of detection, which is calculated as a function of key nanoribbon dimensional parameters, such as strip thickness and width, and fill fraction (nanoribbon width to array period ratio). The analysis shows that there are specific values of the fill fraction that optimize, that is, minimize, the limit of detection for particular nanoribbon dimensions. Fabrication issues are also discussed. This study is expected to assist in the design and implementation of SPR biosensors based on nanopatterned 2D materials.
Technical Digest. CLEO/Pacific Rim 2001. 4th Pacific Rim Conference on Lasers and Electro-Optics (Cat. No.01TH8557)
GaAs/AlGaAs buried-heterostructure in-plane lasers and vertical-cavity surface-emitting lasers us... more GaAs/AlGaAs buried-heterostructure in-plane lasers and vertical-cavity surface-emitting lasers using GaInP:Fe as the burying layer have been fabricated and investigated. Regrowth of GaInP:Fe around etched laser mesas was achieved by hydride vapor phase epitaxy. The lasers exhibit good performance under CW operation and show promising high-speed characteristics.
Optics Express, 2012
In this paper, a metal layer assisted guide mode resonance (MaGMR) device with high sensitivity i... more In this paper, a metal layer assisted guide mode resonance (MaGMR) device with high sensitivity is proposed for bioanalytical applications and its functioning is experimentally proved. We find that the reflection spectra present a unique inversed response. The resonance mechanism is also discussed. Numerical calculation results indicate that the high sensitivity performance of MaGMR comes from the strongly asymmetric resonance modal profile and low propagation angle inside the waveguide. There is a one-fold enhancement of the evanescent wave in the analytes region compared to typical GMR. According to the experimental results, the proposed MaGMR achieved a bulk sensitivity of 376.78nm/RIU in fundamental TM mode resonating at 0.809µm with the first diffraction angle. Experiment results show a 264.78% enhancement in the sensitivity compared to that of the typical GMR sensor in the same resonance conditions of TM mode.
2008 IEEE/LEOS International Conference on Optical MEMs and Nanophotonics, 2008
Here we review some recent photonic related developments from the FP6-IST-SABIO project (026554) ... more Here we review some recent photonic related developments from the FP6-IST-SABIO project (026554) such as a demonstration of label-free optical biosensing with slot-waveguides and tolerance analysis of high efficiency silicon nitride surface grating couplers.
Sensors and Actuators B-Chemical, 2012
... [5] CA Barrios, C. Zhenhe, F. Navarro-Villoslada, D. López-Romero, and MC Moreno-Bondi, “M... more ... [5] CA Barrios, C. Zhenhe, F. Navarro-Villoslada, D. López-Romero, and MC Moreno-Bondi, “Molecularly imprinted polymer diffraction grating as label-free optical bio(mimetic)sensor, †Biosensors and Bioelectronics, 26, pp. 2801-2804, 2011. [6] TK Gaylord and MG ...
CLEO/Europe. 2005 Conference on Lasers and Electro-Optics Europe, 2005., 2005
A compact structure for highly efficient optical coupling to/from slot-waveguide from/to channel-... more A compact structure for highly efficient optical coupling to/from slot-waveguide from/to channel-waveguide is presented. The mode-converter permits an achievement of coupling efficiency as high as 99.3% for a 3-mum-long coupler
Applied Physics Letters
In this work, cross-sectional scanning capacitance microscopy (SCM) is used to investigate GaAs/A... more In this work, cross-sectional scanning capacitance microscopy (SCM) is used to investigate GaAs/AlGaAs buried heterostructure lasers. Laser mesas are buried with GaInP:Fe selectively regrown by hydride vapor phase epitaxy. It is shown that a complete 2D map of the electrical properties of device structure including, delineation of regrown interfaces and electrical nature of the regrown GaInP layer can be obtained.
We demonstrate a 20-mum-radius disk resonator based on Si/SiO2 slot-waveguide. Quality factors ar... more We demonstrate a 20-mum-radius disk resonator based on Si/SiO2 slot-waveguide. Quality factors around 1,000 are measured. Low effective refractive index evidences light guiding in the low index SiO2 layer.
The 15th Annual Meeting of the IEEE Lasers and Electro-Optics Society, 2002
ABSTRACT Hydride vapour phase epitaxy is flexible for fabricating buried heterostructure lasers y... more ABSTRACT Hydride vapour phase epitaxy is flexible for fabricating buried heterostructure lasers yielding high bandwidth. Its potential for long and short wavelength lasers based on the emerging materials systems GaAs/GaInAs(N)(Sb) and GaAs/AlGaAs, respectively is highlighted. In-situ mesa etching cum immediate regrowth and heteroepitaxy of InP on silicon are additional facilities offered by HVPE.
Al is orders of magnitude cheaper than Au, however its use as a plasmonic material in biosensors ... more Al is orders of magnitude cheaper than Au, however its use as a plasmonic material in biosensors is restricted due to corrosion challenges. In this talk, a method to circumvent this issue and biosensing applications of Al nanohole arrays will be presented.
confinement layer. The precisely delined laser diameter, the small index difference between the m... more confinement layer. The precisely delined laser diameter, the small index difference between the mesa and the burying material, the SI properties and the efficient heat removal provided by the regrown material, make this technique very promising for high-speed singleniode VCSEL fabrication. Acknowkedgmnt: The authors would like to thank F. Salomonsson and R. Stevens for their support in the characterisation tasks, and the Swedish National Board for Industrial and Technical Development (NUTEK) for their financial support, within tlie framework of KOFUMA project. In contrast to QW lasers, quantum dot (QD) emitters are wellsuited Tor use as low-threshold, broadband tunable sources owing to two unique features of QD structures [3]. First, the low QD density of states causes the QD ground state optical gain to saturate easily. This means that the higher-order energy lcvels are populated
We propose a tunable electro-optic modulator using ring resonators on silicon-on-insulator substr... more We propose a tunable electro-optic modulator using ring resonators on silicon-on-insulator substrate. Optical modulation is achieved using free carrier injection. A steady state on-off ratio of 90% at 775MHz is achievable with the proposed scheme.
We demonstrate a 20-μm-long tunable optical Fabry-Perot resonator integrated on a silicon-on-insu... more We demonstrate a 20-μm-long tunable optical Fabry-Perot resonator integrated on a silicon-on-insulator waveguide. The device is electrically driven and shows a modulation depth as high as 53% for a power consumption of only 20 mW
We present theoretical and experimental evidence of a novel wavelength-insensitive waveguide geom... more We present theoretical and experimental evidence of a novel wavelength-insensitive waveguide geometry for guiding and confining light in nanometer-wide low-index materials, based on the discontinuity of the electric field at high-index-contrast interfaces.
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Papers by Carlos A Barrios