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  • Articles  (69)
  • PAPER CURRENT  (69)
  • Institute of Electrical and Electronics Engineers (IEEE)  (69)
  • 2010-2014  (69)
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  • Articles  (69)
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  • PAPER CURRENT  (69)
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  • Institute of Electrical and Electronics Engineers (IEEE)  (69)
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  • 1
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    Highly Efficient Tunable Dispersive Wave in a Tellurite Microstructured Optical Fiber (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-31
    Description: We demonstrate a highly efficient, stable, and tunable dispersive wave (DW) emitted by the soliton in a tellurite microstructured optical fiber. The dependence of the generated DW properties on the average pump power is experimentally investigated. By using the 80-MHz pulse emitted from an optical parametric oscillator as the pump source, the DW from $sim$ 1626 to 1685 nm is obtained with the average pump power changing from $sim$ 250 to 440 mW at the pump wavelength of $sim$ 1760 nm. The conversion efficiency is over $sim$ 65%. The full width at half maximum (FWHM) of DW pulse at the center wavelength of $sim$ 1626 nm is $sim$ 90 fs, which was measured by an intensity autocorrelator. The stable DW pulse can be used as a near-infrared femtosecond source.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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  • 2
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    Gold Elliptic Nanocavity Array Biosensor With High Refractive Index Sensitivity Based on Two-Photon Nanolithography (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-31
    Description: Metallic nanostructure arrays have been highlighted by their tremendously promising applications, such as biosensors, light harvesting, and fluorescence enhancement. To reach the aim of obtaining an inexpensive gold elliptic nanocavity array (GENA) biosensor, which has high refractive index sensitivity, the two-photon nanolithography, with the advantages of high resolution, low cost, time-saving, etc., is used to fabricate GENAs. The characteristics of these GENA biosensors are experimentally and theoretically investigated. A finite-difference time-domain method is applied to analyze the GENAs' localized surface plasmon resonance modes in the transmission spectra of GENAs and steady-state field intensity distributions. The refractive index sensitivities of the GENAs are characterized by the transmission spectra of GENAs in water and varied concentrations of NaCl solution. The results illustrate that the GENA biosensor under coupled mode sensing has high refractive index sensitivity, which reaches 562 nm/RIU.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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  • 3
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    Transferred Flexible Three-Color Silicon Membrane Photodetector Arrays (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-31
    Description: We report the design and fabrication of transfer-printed flexible three-color multijunction 8 $times$ 8 crystalline silicon membrane photodetector arrays. Based on the penetration-depth-dependent absorption of different wavelengths, filter-free color detection can be obtained via three junction photocurrent measurement. The optical measurements show good agreements with the optical behavior predicted by the design and simulation. No noticeable changes were observed in the device performance when it was operated in a bending state.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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  • 4
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    Special Issue on the Third Mediterranean Photonics Conference (MePhoCo2014) (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-20
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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  • 5
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    Fiber Bragg Grating Cryosensors for Superconducting Accelerator Magnets (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-20
    Description: The design, fabrication, and tests of the new generation of superconducting magnets for the High Luminosity upgrade of the Large Hadron Collider (HL-LHC) require the support of an adequate sensing technology able to assure the integrity of the strain-sensitive and brittle superconducting cables through the whole service life of the magnet: assembly up to 150 MPa, cool down to 1.9 K, and powering up to about 16 kA. A precise temperature monitoring is also needed, in order to guarantee the safe working condition of the superconducting cables in the power transmission lines (SC-Link) designed to feed the magnet over long distance. Fiber Bragg Grating–based temperature and strain monitoring systems have been implemented in the first SC-Link prototype and in two subscale dipole magnets and tested in the cryogenic test facility at CERN, at 30 K, 77 K, and 1.9 K.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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  • 6
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    Online Tests of an Optical Fiber Long-Period Grating Subjected to Gamma Irradiation (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-20
    Description: This paper reports the outcomes of the tests that we conducted as online measurements for the evaluation of one optical fiber long-period grating produced by a fusion technique in a single-mode radiation-hardened optical fiber, and subjected to gamma irradiation. During the irradiation, the grating temperature was monitored. Before the irradiation, the temperature sensitivity of the grating was 27.7 $hbox{pm}/^{circ}hbox{C}$ , while the value of this parameter postirradiation was found to be 29.3 $hbox{pm}/^{circ}hbox{C}$ . The spectral characteristics of the grating were measured (i) in the laboratory with an ANDO AQ6317C optical spectrum analyzer and (ii) online, for the first time , with a LUNA OBR 4600 backscatter reflectometer, operating in the frequency acquisition mode. Such online measurement enables the study of recovery effects during the irradiation. The wavelength dip of the grating shifted under gamma irradiation, with 16 pm/kGy for the maximum total dose of 45 kGy. At room temperature, the recovery of the irradiation-induced shift of the wavelength dip was almost complete in about 120 h, at a rate of 6.7 pm/h. Postirradiation heating of the sensor produced the reversing of the recovery effect. The investigation indicated that, up to 45 kGy, the grating is more sensitive to radiation than other optical fiber sensors.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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  • 7
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    Label-Free $hbox{Si}_{3}hbox{N}_{4}$ Photonic Crystal Based Immunosensors for Diagnostic Applications (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-20
    Description: Immunosensors are devices that exploit immobilized antibodies to promote the binding of specific analytes related to diseases of medical importance, such as cancer or cardiac dysfunctions. Label-free immunosensors have an important role, due to their simplicity and fast read-out. Here, the proof of concept for an immunosensor based on a 2-D photonic crystal silicon nitride membrane is presented. The device has been fabricated by means of a well-tuned nanofabrication protocol, achieving a high-quality photonic pattern on a large-area membrane (1 mm $times$ 1 mm), and it has been tested for the detection of interleukin-6, getting protein detection at pg/mL concentrations.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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  • 8
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    Coupling Effects Among Degenerate Modes in Multimode Optical Fibers (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-20
    Description: Multimode optical fibers have recently received revived attention in the framework of space-division multiplexed systems, where the spatial diversity of fiber modes is exploited to increase transmission capacity. The complexity of these systems strongly depends on the coupling characteristic of the fiber. Therefore, a better description of coupling effects may lead to the more accurate modeling of the system and to an optimized design of multimode fibers. In this paper, we analyze coupling among (quasi) degenerate modes as a consequence of different kinds of coupling sources.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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  • 9
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    Deflection Monitoring Method Using Fiber Bragg Gratings Applied to Tracking Particle Detectors (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-20
    Description: This paper proposes the use of fiber Bragg gratings (FBGs) for the deflection monitoring of a micromegas (MM) tracking particle detector to be installed at the European Organization for Nuclear Research during a major upgrade of the experiment ATLAS within 2018. MM detectors are designed to reach high spatial and time resolution, even if the design is not yet finalized. One mandatory issue for the MM detector is a precise monitoring of the deflection of the drift and read-out electrodes and/or of the panel hosting the electrodes. To this aim, FBG strain sensors are proposed and experimentally investigated as a sensing solution to monitor the strain state of the detector support panel hosting the drift and read-out electrodes. Finally, simple postprocessing analysis based on classical beam theory considering a rigid body permits calculating the panel deflection. Preliminary experimental results on first prototypes of small and large detector panels are presented and discussed.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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  • 10
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    Electrooptical Characterization of New Classes of Silicon Carbide UV Photodetectors (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-20
    Description: In this paper, we present the fabrication process steps and the characterization of 4H-SiC vertical Schottky UV detectors, where interdigitated strips, acting as top metal contacts, have been realized in $hbox{Ni}_{2}hbox{Si}$ . These devices exploit the pinch-off surface effect. $I$ – $V$ and $C$ – $V$ characteristics, as functions of temperature, were measured in dark conditions. In addition, we have carried out responsivity measurements, for wavelengths ranging from 200 to 400 nm, at varying package temperature and applied reverse bias. A comparison among devices having different strip pitch sizes has been performed, thus finding out that the 10- $muhbox{m}$ pitch class demonstrates the top performances as regards the tradeoff between exposed surface area and complete merge of adjacent depleted regions under top contacts.
    Electronic ISSN: 1943-0655
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Published by Institute of Electrical and Electronics Engineers (IEEE)
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