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  • Articles  (69)
  • 2010-2014  (69)
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  • Articles  (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)
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    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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    Absorption and Losses in One-Dimensional Photonic-Crystal-Based Absorbers Incorporating Graphene (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
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    Publication Date: 2014-12-20
    Description: We investigate the linear response of single and multiple graphene sheets embedded in quarter-wave one-dimensional photonic crystals (PhCs) in terms of absorption and losses. In particular, we show that it is possible to achieve near-perfect narrowband absorption when a single monolayer graphene is sandwiched between two PhC mirrors with optimized pair numbers. The simulations reveal that the resonant wavelength and the total absorption frequency may be tuned by tilting the angle of incidence of the impinging source. We also show that the losses, related to the dielectric materials constituting the one-dimensional PhC, can degrade the optical performance of the device. Conversely, by arranging the same dielectric slabs in a different order (supercell), it is possible to achieve a broadband absorption that is almost constant over a wide range of angle of incidence. In this configuration, the absorption and the bandwidth can be tuned by varying the supercell geometry. These features make these devices attractive for different applications ranging from tunable and saturable absorbers for short-pulse lasers to graphene-based photodetectors.
    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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    Design of an Optical Trapping Device Based on an Ultra-High Q/V Resonant Structure (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-20
    Description: A novel photonic/plasmonic cavity based on a 1-D photonic crystal cavity vertically coupled to a plasmonic gold structure is reported. The design has been optimized to achieve an ultra-high Q/V ratio, therefore improving the light–matter interaction and making the device suitable for optical trapping applications. Accurate 3-D finite element method (FEM) simulations have been carried out to evaluate the device behavior and performance. The device shows ${rm Q} = 2.8 times 10^{3}$ and ${rm V} = 4 times 10^{-4} (lambda/{rm n})^{3}$ , which correspond to a ${rm Q}/{rm V} = 7 times 10^{6} (lambda/{rm n})^{-3}$ with a resonance transmission around 50% at $lambda_{rm R} = 1589.62 hbox{nm}$ . A strong gradient of the optical energy has been observed in the metal structure at the resonance, inducing a strong optical force and allowing a single particle trapping with a diameter less than 100 nm. The device turns out very useful for novel biomedical applications, such as proteomics and oncology.
    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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    InGaN-LD-Pumped ${rm Pr}^{3+}$ : ${rm LiYF}_{4}$ Continuous-Wave Laser at 915 nm (2014)
    Institute of Electrical and Electronics Engineers (IEEE)
    Details
    Publication Date: 2014-12-20
    Description: We demonstrate the first InGaN-LD-pumped room temperature and continuous-wave laser operation of a ${rm Pr}^{3+}$ : ${rm LiYF}_{4}$ crystal at 915 nm. A maximum output power up to 78 mW with a laser slope efficiency of about 17% is obtained. The round-trip optical losses are estimated to be about 0.45%, and the ${rm M}^{2}$ beam quality factors measured in $x$ and $y$ dimensions are about 1.07 and 1.04, respectively.
    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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    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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  • 8
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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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  • 9
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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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  • 10
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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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