1. Ziyang Zhang

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    1. Mentioned In 7 Articles

    2. Quantification of Ellipsoid Zone Changes in Retinitis Pigmentosa Using en Face Spectral Domain–Optical Coherence Tomography

      Quantification of Ellipsoid Zone Changes in Retinitis Pigmentosa Using en Face Spectral Domain–Optical Coherence Tomography
      Importance New methods are needed to quantify the change in the outer retinal structures in retinitis pigmentosa (RP). Objective To implement an alternate method for tracking ellipsoid zone (EZ) changes in RP by quantifying the EZ area on en face spectral domainoptical coherence tomographic (SD-OCT) images. Design, Setting, and Participants Data for this observational case study were collected at the Department of Ophthalmology, University of California, Los Angeles, from May ...
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    3. GaAs-Based Superluminescent Light-Emitting Diodes with 290-nm Emission Bandwidth by Using Hybrid Quantum Well/Quantum Dot Structures

      GaAs-Based Superluminescent Light-Emitting Diodes with 290-nm Emission Bandwidth by Using Hybrid Quantum Well/Quantum Dot Structures
      A high-performance superluminescent light-emitting diode (SLD) based upon a hybrid quantum well (QW)/quantum dot (QD) active element is reported and is assessed with regard to the resolution obtainable in an optical coherence tomography system. We report on the appearance of strong emission from higher order optical transition from the QW in a hybrid QW/QD structure. This additional emission broadening method contributes significantly to obtaining a 3-dB linewidth of ...
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    4. Feature Of The Week 2/22/09: Self-Assembled Quantum Dots for High-Performance Broadband Optical Coherence Tomography Sources

      Feature Of The Week 2/22/09: Self-Assembled Quantum Dots for High-Performance Broadband Optical Coherence Tomography Sources
      ...most recently by utilizing their natural broad emission spectra due to the large dot sizes inhomogeneity. Dr. Ziyang Zhang et al from the University of Sheffield have done a lot of interesting work on the investigation o...
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    5. A p-type-doped quantum dot superluminescent LED with broadband and flat-topped emission spectra obtained by post-growth intermixing under a GaAs proximity cap

      A p-type-doped quantum dot superluminescent LED with broadband and flat-topped emission spectra obtained by post-growth intermixing under a GaAs proximity cap
      Broadband superluminescent light emitting diodes are realized by a post-growth annealing process, on modulation p-doped multiple InAs/InGaAs/GaAs quantum dot layer structures, under a GaAs proximity cap. The device exhibits a large and flat emission with spectral width up to 132 nm at 2 mW. This is mainly attributed to the reduction of the energy separation between the ground state and the excited state, in addition to the optical ...
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    6. Realization of extremely broadband quantum-dot superluminescent light-emitting diodes by rapid thermal-annealing process

      The first demonstration, to our knowledge, of the creation of ultrabroadband superluminescent light-emitting diodes using multiple quantum-dot layer structure by rapid thermal-annealing process is reported. The device exhibits a 3 dB emission bandwidth of 146 nm centered at 984 nm with cw output power as high as 15 mW at room temperature corresponding to an extremely small coherence length of 6.6 μm.
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  2. About Ziyang Zhang

    Ziyang Zhang

    Ziyang Zhang is a Research Associate in the Electronic and Electrical Engineering Department at The University of Sheffield.