Skip to main content

9 Result(s)

within Sung-Hak Cho Remove this filter Manufacturing, Machines, Tools, Processes Remove this filter

and

  1. No Access

    Article

    Ablation morphology and defect analysis of Ti thin film irradiated by femto- and picosecond laser for fine ablation of Micro-LED display thin film transistor repair

    The titanium (Ti) thin film is a material used in the thin-film transistor (TFT) of Micro-LED display and require partial processing during repair processes. For a suitable repair process, defects such as part...

    Junha Choi, Sung-Hak Cho in Applied Physics A (2024)

  2. No Access

    Article

    Ablation morphology and characteristic analysis of anisotropic conductive film (ACF) using femtosecond lasers with NIR, Green, and DUV wavelengths for micro-LED display repair

    Anisotropic conductive film (ACF) is an electrical and electronic material composed of conductive balls embedded in a polymer matrix. ACF plays a crucial role in connecting electrodes and chips in Micro-LEDs. ...

    Junha Choi, Kwangwoo Cho, Sung-Hak Cho in Applied Physics A (2024)

  3. No Access

    Article

    Fine ablation with depth control of 25-nm resolution and morphologies irradiated by femtosecond laser pulses via beam sha**

    Recently, the need for enhanced cutting tools to fabricate next-generation multilayer ceramic capacitors (MLCCs) and batteries has been identified. This is because existing cutting tools cause problems such as...

    Young-Gwan Shin, Junha Choi, Sung-Hak Cho in Applied Physics A (2023)

  4. No Access

    Article

    Morphologies of cemented tungsten carbide ablated by pulsed femtosecond laser to manufacture next-generation blades of a cutting tool

    Enhanced cutting tool blades are required to manufacture next-generation small multilayer ceramic capacitors. Cemented tungsten carbide is used as the material for these blades. Recently, laser ablation has be...

    Young-Gwan Shin, Seok-Young Ji, Junha Choi, Sung-Hak Cho in Applied Physics A (2022)

  5. No Access

    Article

    Enhancement periodic regularity of surface nano ripple structures on Si wafer using a square shaped flat-top beam femtosecond NIR laser

    We report a new enhanced periodic regularity of surface nano ripple structures on a Si wafer using a square shaped flat-top beam femtosecond (190 fs) laser ( ...

    Junha Choi, Wonsuk Choi, Young-Gwan Shin, Seung Han, Kwang-Seop Kim… in Applied Physics A (2021)

  6. No Access

    Article

    Morphologies of femtosecond laser ablation of ITO thin films using gaussian or quasi-flat top beams for OLED repair

    This study compares the ablation morphologies obtained with a femtosecond laser of both Gaussian and quasi-flat top beam profiles when applied to indium tin oxide (ITO) thin films for the purpose of OLED repai...

    Hoon-Young Kim, Won-Suk Choi, Suk-Young Ji, Young-Gwan Shin… in Applied Physics A (2018)

  7. No Access

    Article

    Selective lift-off of GaN light-emitting diode from a sapphire substrate using 266-nm diode-pumped solid-state laser irradiation

    Selective laser lift-off of GaN from a sapphire substrate was demonstrated using 266-nm diode-pumped solid-state laser irradiation. To fabricate a single GaN light-emitting diode (LED) with a size of 100 μm × ...

    Jaegu Kim, Jae-Hyun Kim, Sung-Hak Cho, Kyung-Hyun Whang in Applied Physics A (2016)

  8. No Access

    Article

    Removal of nanoparticles on silicon wafer using a self-channeled plasma filament

    The effective removal of nanoparticles from a silicon wafer surface was demonstrated using the self-channeled plasma filament excited by a femtosecond (130 fs) Ti:sapphire laser (λ p=790 nm). The ...

    Jung-Kyu Park, Ji-Wook Yoon, Kyung-Hyun Whang, Sung-Hak Cho in Applied Physics A (2012)

  9. No Access

    Article

    Surface pattern formation on Cr thin film with ultrafast laser pulse

    Laser irradiation of a metal surface with multiple pulses just below the ablation threshold generates a periodic surface pattern known as the laser-induced periodic surface structure. The aim of this study is ...

    Jae-Gu Kim, Sung-Hak Cho, Tae-** Je, Doo-Sun Choi, Kyung-Hyun Whang in Applied Physics A (2010)