24 research outputs found

    Experimental and theoretical confirmation of Bloch-mode light propagation in planar photonic crystal waveguides

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    The dispersion diagram of the leaky modes in the planar photonic crystal waveguide is experimentally obtained for the wavelengths from 1440 to 1590 nm. A small stop band, around wavelength 1500 nm, is detected. The experimentally obtained results are in very good agreement with our three-dimensional finite difference time domain calculations. Propagation losses of the leaky modes are estimated and we have found that they decrease as we approach the ministop band

    Waveguiding at 1550 nm using photonic crystal structures in silicon on insulator wafers

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    Design, fabrication and light guiding in planar photonic crystal structures including sharp corners with a bending radius less than 1 micron are demonstrated at 1550 nm wavelength in silicon waveguides on silicon dioxide substrates. Photon confinement in the sample plane was achieved by a photonic crystal structure while confinement in the vertical direction was achieved by index of refraction contrast

    Experimental characterization of dispersion properties of leaky modes in planar photonic crystal waveguide

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    We have experimentally observed the coupling of a Bloch wave in a single-line-defect planar photonic crystal and have mapped the dispersion diagram of the leaky mode component of this wave. The results are in excellent agreement with our three-dimensional finite difference time domain calculations

    Experimental characterization of dispersion properties of the leaky modes in planar photonic crystal waveguide

    Get PDF
    We have experimentally obtained the dispersion diagram of the leaky modes in a planar photonic crystal waveguide for wavelengths from 1440 nm to 1590 nm. A small stop band around λ=1500 nm is also detected. The experimental results are in very good agreement with our 3D FDTD calculations

    Waveguiding at 1550 nm using photonic crystal structures in silicon on insulator wafers

    Get PDF
    Design, fabrication and light guiding in planar photonic crystal structures including sharp corners with a bending radius less than 1 micron are demonstrated at 1550 nm wavelength in silicon waveguides on silicon dioxide substrates. Photon confinement in the sample plane was achieved by a photonic crystal structure while confinement in the vertical direction was achieved by index of refraction contrast

    Experimental characterization of dispersion properties of leaky modes in planar photonic crystal waveguide

    Get PDF
    We have experimentally observed the coupling of a Bloch wave in a single-line-defect planar photonic crystal and have mapped the dispersion diagram of the leaky mode component of this wave. The results are in excellent agreement with our three-dimensional finite difference time domain calculations

    Alignment of the CMS silicon tracker during commissioning with cosmic rays

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    This is the Pre-print version of the Article. The official published version of the Paper can be accessed from the link below - Copyright @ 2010 IOPThe CMS silicon tracker, consisting of 1440 silicon pixel and 15 148 silicon strip detector modules, has been aligned using more than three million cosmic ray charged particles, with additional information from optical surveys. The positions of the modules were determined with respect to cosmic ray trajectories to an average precision of 3–4 microns RMS in the barrel and 3–14 microns RMS in the endcap in the most sensitive coordinate. The results have been validated by several studies, including laser beam cross-checks, track fit self-consistency, track residuals in overlapping module regions, and track parameter resolution, and are compared with predictions obtained from simulation. Correlated systematic effects have been investigated. The track parameter resolutions obtained with this alignment are close to the design performance.This work is supported by FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia); Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTDS (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA)

    Commissioning and performance of the CMS pixel tracker with cosmic ray muons

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    This is the Pre-print version of the Article. The official published verion of the Paper can be accessed from the link below - Copyright @ 2010 IOPThe pixel detector of the Compact Muon Solenoid experiment consists of three barrel layers and two disks for each endcap. The detector was installed in summer 2008, commissioned with charge injections, and operated in the 3.8 T magnetic field during cosmic ray data taking. This paper reports on the first running experience and presents results on the pixel tracker performance, which are found to be in line with the design specifications of this detector. The transverse impact parameter resolution measured in a sample of high momentum muons is 18 microns.This work is supported by FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia); Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTDS (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA)

    Performance of the CMS drift-tube chamber local trigger with cosmic rays

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    The performance of the Local Trigger based on the drift-tube system of the CMS experiment has been studied using muons from cosmic ray events collected during the commissioning of the detector in 2008. The properties of the system are extensively tested and compared with the simulation. The effect of the random arrival time of the cosmic rays on the trigger performance is reported, and the results are compared with the design expectations for proton-proton collisions and with previous measurements obtained with muon beams
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