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경북대학교 ICT창의인재양성사업단, Brain Korea 21 Plus KNU ICT Open CourseWare

카테고리Category

홈 > 학문/산업 분야별 강좌

학문/산업 분야별 강좌

전체강좌 17, 현재 1 / 전체 2페이지
  • Vertical silicon nanowires for image sensor applications 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 세미나 및 튜토리얼

     

    Conventional image sensors achieve color imaging using absorptive organic dye filters. These face considerable challenges however in the trend toward ever higher pixel densities and advanced imaging such as multispectral imaging and polarization-resolved imaging. In this talk, we will present a new paradigm for color imaging based on all-silicon nanowire devices without any color filters. We fabricate pixels consisting of vertical silicon nanowires with integrated photodetectors, demonstrate that t heir spectral sensitivities are governed by nanowire radius, and perform color imaging. We also demonstrate polarization-resolving photodetectors consisting of silicon nanowires with elliptical cross sections. Our approach is conceptually different from filter-based methods, as absorbed light is converted to photocurrent, ultimately presenting the opportunity for very high photon efficiency. This work was performed at Harvard University under the supervision of Prof. Kenneth B. Crozier.

     

    더보기+
    강좌기간 : 2018-04-30 ~ 2018-04-30 | 강좌수 : 1 | 최근업데이트 : 2018-05-01 |조회 : 19
  • High performance InAs quantum dot lasers epitaxially grown on on-axis (001) Si for silicon photonics 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 세미나 및 튜토리얼



    Quantum dot
    lasers epitaxially grown on Si are promising for an efficient light source for
    silicon photonics. In the talk, I will present record-high performance and
    excellent reliability of 1.3 μm quantum dot lasers on Si enabled by a low
    threading dislocation density GaAs buffer layer. Continuous-wave threshold
    currents as low as 4.8 mA and output powers of 185 mw have been achieved from
    narrow ridge-waveguide lasers at 20 °C. P-modulation doped lasers operated up
    to 107 °C. 1800-hour reliability tests at 35 °C showed an extrapolated
    mean-time-to-failure of more than a million hours. Micro-ring QD lasers on Si
    were also fabricated and showed an ultralow threshold current of 0.5 mA. I will
    also present a preliminary result on monolithically integrated III/V laser,
    waveguide, and photodetectors on Si. This represents a significant stride
    toward efficient, scalable, and reliable III-V lasers on on-axis Si substrates for
    photonic integrate circuits that are fully compatible with CMOS foundries.



     

    더보기+
    강좌기간 : 2018-01-03 ~ 2018-01-03 | 강좌수 : 1 | 최근업데이트 : 2018-01-03 |조회 : 43
  • High-speed III-nitride laser diodes for visible light communication 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 세미나 및 튜토리얼

    III-nitride laser diodes (LDs) have been developed for many applications such as optical storage, medical, and solid-state lighting. However, the performance of LDs grown on conventional polar (0001) c-plane GaN has been hindered due to polarization-induced electric fields, leading to a reduction of wave-function overlap. Recent progress on semipolar and nonpolar planes has shown significant improvement in high-power performance of LEDs and LDs by reducing the polarization-induced electric field. Conventional III-nitride LEDs have typical bandwidth limits in the MHz range due to comparatively long carrier lifetime (on the order of ns) and significant RC parasitic effect. Even worse, for white lighting configuration, the response is significantly limited by slow relaxation lifetime (on the order of μs) of phosphor conversion. However, recent studies on LDs for light fidelity (LiFi) applications have demonstrated more than GHz bandwidth and Gbit/s data transmission rate with inherent advantage of short photon lifetime. As an alternative to LED technology, the use of laser diodes (LDs) as a transmitter presents a viable approach to overcome the limitations of modulation bandwidth as well as the lighting efficiency. Despite of these merits, only limited studies have been reported for LD-based VLC and LiFi demonstration without notable improvement in modulation capabilities. Since semipolar and nonpolar LDs are expected to have higher differential gain and lower threshold than c-plane LDs as mentioned above, they also have high potential for improvements in modulation bandwidth. Thus, nonpolar and semipolar LD is potential candidate for future LiFi applications requiring high-capacity for high-speed data transmission as well as high-efficiency for lighting.

     

     

    더보기+
    강좌기간 : 2017-11-15 ~ 2017-11-15 | 강좌수 : 1 | 최근업데이트 : 2017-11-15 |조회 : 16
  • Developing Materials for Next Generation Device Applications 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 세미나 및 튜토리얼

     

    강좌기간 : 2017-03-15 ~ 2017-03-15 | 강좌수 : 1 | 최근업데이트 : 2017-04-06 |조회 : 30
  • Fundamentals of Molecular Beam Epitaxy 1 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 세미나 및 튜토리얼

     

    강좌기간 : 2017-03-14 ~ 2017-03-14 | 강좌수 : 1 | 최근업데이트 : 2017-04-06 |조회 : 15
  • Fundamentals of Molecular Beam Epitaxy 2 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 세미나 및 튜토리얼

     

    강좌기간 : 2017-03-14 ~ 2017-03-14 | 강좌수 : 1 | 최근업데이트 : 2017-04-06 |조회 : 4
  • Oxides for Novel Device Applications 1 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 세미나 및 튜토리얼

     

    강좌기간 : 2017-03-14 ~ 2017-03-14 | 강좌수 : 1 | 최근업데이트 : 2017-04-06 |조회 : 7
  • Oxides for Novel Device Applications 2 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 세미나 및 튜토리얼

     

    강좌기간 : 2017-03-14 ~ 2017-03-14 | 강좌수 : 1 | 최근업데이트 : 2017-04-06 |조회 : 15
  • FDSOI technology for scaling, low power, and enriched functionality 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 세미나 및 튜토리얼

     The acronym FD-SOI is composed of two important words. All devices from now to the end of the roadmap will be Fully Depleted (FD) whatever their intrinsic architecture: FinFET, planar, 3D, or nanowire FET. They need to be thin in at least one direction which makes FD inevitable.

    더보기+
    강좌기간 : 2016-10-11 ~ 2016-10-11 | 강좌수 : 1 | 최근업데이트 : 2016-10-31 |조회 : 249
  • 반도체 및 디스플레이공학 단기집중강좌 영상 +강의담기 학문/산업 분야별 강좌 ▶ 반도체 ▶ 산학 강좌

     In the application of light in an engineering context such as in display, lighting and optical communications, units that describe intensity, radiance, flux, irradiance and exitance are used. To describe the visual sensation of color, another unit to measure color is needed. This lecture introduces these units and provide simple examples of their applications.

     

    더보기+
    강좌기간 : 2016-09-05 ~ 2016-09-30 | 강좌수 : 11 | 최근업데이트 : 2016-09-30 |조회 : 625
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