Seong-Ho Shin

Gimbaled 2D Scanning Mirror with Vertical Combs for Laser Display

We designed a gimbaled 2D scanning mirror (GSM) which is driven electrostatically by vertical comb fingers. The horizontal scanning mirror with a diameter of 1 mm is rotating with respect to y-axis in the eye-shaped frame. For vertical scanning, the eye-shaped frame is rotating with respect to x-axis which is perpendicular to the horizontal scanning axis. This GSM can be actuated in two axes simultaneously resulting in the realization of 2D image in the screen with single beam raster scanning. We obtained a mechanical scanning angle of plusmn8deg(resonance) and plusmn4.2deg(non-resonance), with the resonant frequency range of 24~24.5 kHz and 800~900 Hz under the sinusoidal and triangular driving voltages for horizontal and vertical scanning, respectively

Use of Spin-On-Hard Mask Materials for nano scale patterning technology

Amorphous Carbon Layer (ACL) and SiON system has been proven to be a good hardmask combination. These layers are formed by a high cost, low throughput CVD process. This paper discloses a reliable, low cost, high throughput process using a simple spin on layer structure. Through manipulation of various parameters, additional BARC layer is eliminated and the process is further simplified to a tri-layer structure. Also, PR/SiON/C-SOH (Carbon-Spin-On-Hardmask) system has been compared to PR / Si-SOH (Si-Spin-On-Hardmask ) / C-SOH system and found their performances are comparable. This indicates the PR / Si-SOH / C-SOH process is an economical yet comparable substitute.