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  1. No Access

    Article

    Ion Emission During Low Fluence KrF Laser-Metal Interaction

    A KrF laser was used to produce ions from an aluminum surface. The threshold energy fluence was found to be ∼30 mJ/cm2 which was lower than similar studies on the ablation of metals. The measured threshold howeve...

    Q. Y. Ying, H. S. Kwok in MRS Online Proceedings Library (2011)

  2. No Access

    Article

    Spectroscopic ellipsometry of 3,4,9,10-perylenetetracarboxylic dianhydride (PTCDA)

    The optical functions of PTCDA have been determined by spectroscopic ellipsometry. The samples were prepared by thermal evaporation of PTCDA on glass substrates. The influence of the substrate temperature on t...

    A.B. Djurišić, C.Y. Kwong, W.L. Guo, Z.T. Liu, H.S. Kwok, W.K. Chan in Applied Physics A (2003)

  3. No Access

    Article

    Optical functions of tris (8-hydroxyquinoline) aluminum (Alq3) by spectroscopic ellipsometry

    Optical functions of tris (8-hydroxyquinoline) aluminum (Alq3) have been studied in the spectral range from 1.55 eV to 5 eV using spectroscopic ellipsometry. The samples have been deposited by thermal evaporation...

    A.B. Djurišić, C.Y. Kwong, T.W. Lau, E.H. Li, Z.T. Liu, H.S. Kwok… in Applied Physics A (2003)

  4. No Access

    Article

    Enhanced drilling using a dual-pulse Nd:YAG laser

    A new method for improving the efficiency of laser drilling has been developed. Two synchronized free-running laser pulses from a tandem-head Nd:YAG laser are capable of drilling through 1/8-in-thick stainless...

    C. Lehane, H.S. Kwok in Applied Physics A (2001)

  5. No Access

    Article

    Pulsed laser deposition of silicate phosphor thin films

    Three types of silicate phosphor thin films, emitting in the red-green-blue (RGB) primary colors, were fabricated by pulsed laser deposition, including manganese and lead doped calcium silicate (CaSiO3:MnPb) for...

    X.W. Sun, H.S. Kwok in Applied Physics A (1999)

  6. No Access

    Article

    Ultra Thin Indium Tin Oxide Films On Various Substrates By Pulsed Laser Deposition

    Indium Tin Oxide (ITO) thin films with low resistivities of 0.1∼0.2 mΩ-cm were deposited on various substrates such as YSZ, glass, and ZnO buffered glass by pulsed laser deposition (PLD). The X-ray rocking cur...

    X. W. Sun, D. H. Kim, H. S. Kwok in MRS Online Proceedings Library (1997)

  7. No Access

    Article

    P-Type II-VI Compound Semiconductor Thin Films Grown by Pulsed Laser Deposition

    Epitaxial and compositionally homogeneous SnxGe1-x alloy films have been grown on Si (001) by pulsed laser deposition using elemental Sn and Ge targets. these results demonstrate that pulsed laser deposition can ...

    W. P. Shen, H. S. Kwok in MRS Online Proceedings Library (1995)

  8. No Access

    Article

    Room Temperature Laser Deposited Indium Tin Oxide Films for Display Applications

    Indium tin oxide is the most basic transparent electrode material for all flat panel displays. Commercial ITO glass is manufactured mostly by sputtering. Here, we report the use of pulsed laser deposition to p...

    W. C. Yip, A. Gururaj Bhat, H. S. Kwok in MRS Online Proceedings Library (1994)

  9. No Access

    Article

    Indium Tin Oxide Films Formation by Laser Ablation

    The electrical and optical properties of room temperature laser deposited indium tin oxide films were studied. It was found that the resistivity of the film was quite sensitive to the deposition conditions. At...

    J. P. Zheng, H. S. Kwok in MRS Online Proceedings Library (1993)

  10. No Access

    Article

    A Unity Quantum Efficiency Photodiode Using Porous Silicon Film

    A highly sensitive photodiode was fabricated with a metal-porous silicon junction. The spectral response was measured for the wavelength range from 400 nm to 1.075 μn. It was demonstrated that close to unity q...

    J. P. Zheng, K. L. Jiao, W. P. Shen, W. A. Anderson… in MRS Online Proceedings Library (1992)

  11. No Access

    Article

    Laser Deposition of CdS Thin films on Various Substrates

    We have deposited CdS thin films onto substrates such as glass, sapphire and high Tc YBCO superconducting films by Nd:YAG laser evaporation in a vacuum environment. X-ray diffraction, optical and electrical me...

    L. Shi, Y. Hashishin, S. Y. Dong, H. S. Kwok in MRS Online Proceedings Library (1990)

  12. No Access

    Article

    Crosslinking and Ciiain-Scission of Photosensitive Polyimidesiloxane Under Deep UV Irradiation

    Polyimides are considered as promising packaging materials in multi-layer interconnections and multi-chip modules because of their low dielectric constant and good planarizability. Photosensitive polyimidesilo...

    S. Jeng, M. Xu, H. S. Kwok, D. Y. Tang, H. R. Acharya… in MRS Online Proceedings Library (1990)

  13. No Access

    Article

    Flexible stainless steel foil as a substrate for superconducting Y-Ba-Cu-O films

    As-deposited superconducting Y-Ba-Cu-O films have been grown on stainless steel substrates by the plasma assisted laser deposition technique. Low interfacial diffusion of iron at the 550°C growth temperature e...

    S. Witanachchi, S. Patel, Y. Z. Zhu, H. S. Kwok… in Journal of Materials Research (1990)

  14. No Access

    Article

    Critical Current Density of Narrow Superconducting Thin Films Fabricated by Laser Ablation Techniques

    The variations of critical current density Jc of narrow Y-Ba-Cu-O films as a function of temperature and magnetic field are investigated. Films with thickness of 150-200 nm and width of 20-100 urn were prepared b...

    L. W. Song, Y. H. Kao, Q. Y. Ying, J. P. Zheng… in MRS Online Proceedings Library (1989)

  15. No Access

    Article

    Laser Patterning and Electrical Properties of Submicron Lines of Y-Ba-Cu-O

    0.6 µm-wide lines of high Tc Y-Ba-Cu-O have been fabricated by direct laser writing on mirror-like thin films which were grown by laser deposition without post annealing. Laser ablation etching had no effect on t...

    J. P Zheng, Q. Y. Ying, H. S. Kim, D. Bhattacharya… in MRS Online Proceedings Library (1989)

  16. No Access

    Article

    Study of In-Situ Laser-Deposition of Superconducting Thin Films by In-Situ Resistance Measurement

    The electric resistance was measured in real time during laser evaporation deposition of superconducting thin films. It was found that different substrates led to different behaviors in the temporal change of ...

    Q. Y. Ying, H. S. Kim, D. T. Shaw, H. S. Kwok in MRS Online Proceedings Library (1989)

  17. No Access

    Article

    Observation of Kosterlitz-Thouless Transition and Conductivity Fluctuation in Superconducting Ybco Thin Films

    Kosterlitz-Thouless properties of laser deposited high Tc superconducting thin films of YBa2Cu3O7-x were examined. The exponent of the power law dependence of V on I showed a “universal jump” at Tc. ID like condu...

    Q. Y. Ying, H. S. Kwok in MRS Online Proceedings Library (1989)

  18. No Access

    Article

    High Speed Infrared Detectors Using Y-Ba-Cu-O Thin Films

    Y-Ba-Cu-O thin films were used for CO2 laser detection. Operation of the Y-Ba-Cu-O detector in both the bolometric and nonbolometric modes were studied. It was found that the detectivity of the superconducting de...

    J. P. Zheng, Q. Y. Ying, H. S. Kwok in MRS Online Proceedings Library (1989)

  19. No Access

    Article

    New Photosensitive Polyimide (SIM2000XL-RTS) for Packaging Applications

    Polyimides are finding increased use as dielectric materials in multi-level metallization technology, which is the key to high-density packaging applications for microelectronics.

    S. Jeng, M. Xu, P. L. Liu, H. S. Kwok, C. J. Lee in MRS Online Proceedings Library (1989)

  20. No Access

    Chapter

    Plasma-Assisted Laser Deposition of Superconducting Thin Films — A Basic Study

    An experimental study of the process of plasma-assisted laser deposition was described. It was found that atomic beams of Y,Ba,Cu, and O were inportant for the in-situ growth of superconducting films. These at...

    H. S. Kwok, J. P. Zheng, Z. Q. Huang… in Science and Technology of Thin Film Superc… (1989)

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