IMID 2024, Jeju, Korea

August 20 - August 23, 2024 (Tue. - Fri.), ICC Jeju

2015 iMiD, Daegu, Republic of Korea

August 18 - 21, 2015 (Tue - Fri), EXCO

<Oral Session : 12-4>

Synthetic Multi Spectral Metamaterials for Frequency Selective Terahertz-Color Filter

Hyunseung Jung, Heyoung Kang, and Hojin Lee

Abstract

In this paper, we demonstrate numerical and experimental studies of the tunable synthetic multi-spectral material (SMM) filter for visible and terahertz ranges. The proposed filter is based on double layered complementary cut wires (CCWs) to construct a thin-film etalon structure. The proposed SMM filter can be fully the fabricated by the conventional photolithography process, and it is confirmed to work as both the transmissive color filter and terahertz filter. From measurement results, we confirm that by adjusting thickness of resonance cavity, SMM filter can show different colors in the visible range but maintain the same transmission spectra in the terahertz range. Furthermore, it is also demonstrated that by adjusting pitch of CCW patterns, transmission peak of the SMM filter can be controlled in the terahertz range while the transmission spectra in the visible range can be kept same.

2018 SPIE Photonics West, San Francisco, United States

January 29 - February 1, 2018 (Mon - Thur), The Moscone Center

<Oral Session>

Energy-harvesting metamaterial based wireless chemical sensor system

Wonwoo Lee, Yonghee Jung, Hyunseung Jung, and Hojin Lee

 Abstract

In this paper, we propose a new wireless chemical sensor system through energy-harvesting metamaterial at microwave frequencies. The effective dielectric constant change, arises from the chemical compounds and their mixtures, leads to the resonance shift of our metamaterial sensor and thus causes spectral change of it energy-harvesting properties. With this variation of energy-harvesting rate of our sensor system that provides intuitive sensing results, the chemical components of the various solutions can be identified. Finally, we expect that our system can offer not only great accessibility but also simplicity for sensor systems including biochemical and dynamic dielectric environment sensing systems.

2015 iMiD, Daegu, Republic of Korea

August 18 - 21, 2015 (Tue - Fri), EXCO

<Poster Session : P2-63>

Novel Operational Amplifier Based on a-InGaZnO TFTs for the Display Driving System

Yongchan Kim, Keun-Yeong Choi, Kichan Kim, and Hojin Lee

Abstract

In this paper, we proposed a novel operational amplifier (op-amp) by using amorphous Indium-Gallium-Zinc-Oxide thin-film transistors (a-InGaZnO TFTs). The proposed op-amp is composed only with n-type TFTs, and can be fabricated within the area of . Through the simulation, the proposed op-amp is confirmed to have an open-loop voltage gain of 29dB at up to 2.6kHz when supply voltage is ±15V. We expect the proposed a-InGaZnO TFT op-amp to be used in designing the power control and driving system for various display applications.

IMID 2022, Pusan, Korea

August 23 - August 26, 2022 (Tue. - Fri.), Bexco