2020.02.12 14:58

IMID 2019, Gyeongju, Korea

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IMID 2019, Gyeongju, Korea

August 27 - 30, 2019 (Tue. - Fri.), HICO



Active pixel sensor circuit using photo-patternable ionic PUA based coplanar a-InGaZnO TFTs

Changhyeon Cho, Yongchan Kim, So Young, Kim, Do Hwan Kim, and Hojin Lee



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Abstract


  Currently, the gate dielectric using the ionic polymer comprising ionic liquids in a polymer matrix to form the electric double layer (EDL) has been extensively studied thin-film transistors field thanks to its advantages of induced ultra-high density carrier attainability in the channel, improved capacitive coupling, low-voltage operation, and low-temperature fabrication process [1, 2]. For patterning the ionic polymer to be used as a gate dielectric for the complex circuits, there have been many different approaches reported such as ‘cut and stick’ method, aerosol printing process, or using additional mold to isolate the ionic liquids. However, most of methods reported so far have challenged on realizing micron-sized fine patterns. In this paper, we adopted photo-patternable ionic polymer as a gate dielectric in the coplanar TFT structure where the gate, source, and drain electrodes were deposited by one lift-off process.


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2015 MRS Spring Meeting, San Francisco, USA

April 6 - 10, 2015 (Mon - Fri), Moscone West Center

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<Poster Session : Z8-14>

Babinet Crosslink Meta-Atoms for Novel Electromagnetically Induced Transparency Analogue

Hyunseung Jung and Hojin Lee

 

Abstract

In this study, we propose a novel EIT analogue by using so-called Babinet crosslink meta-atoms (BCM) at terahertz frequencies. As a BCM unit cell, the two cut-wire (CW) structures and single complementary cut-wire (CCW) aperture are integrated into one meta-atom structure. According to Babinet principle, since the complementary structure has orthogonal polarization compared with its original structure, two CW patterns in the BCMs are oriented for the parallel polarization direction so that they exhibit a broad reflection band, whereas the CCW aperture in the BCMs is oriented for the perpendicular polarization direction so that it exhibits a sharp transmission band to produce EIT properties. By utilizing this EIT analogue, the proposed BCM structures can achieve extraordinary focus of incident wave and subsequently transmit it through the structural window in each meta-atom, whereas the conventional EIT analogues merely transmit the incident wave at their transmission peak. Measurement results verify that the maximum field amplitude and the quality factor of the BCMs are enhanced by 20 times and 1.3 times in comparison to those of the incident field and the conventional CCW apertures, respectively. Therefore, by using the proposed BCMs, we can expect to overcome the power loss problem of incident waves in the conventional EIT analogues. Moreover, based on this exceptional field enhancement property, the proposed BCMs are expected to be utilized for the exotic applications such as low-power bio-chemical sensing and imaging devices, slow light applications with higher spatial resolution, and phase hologram systems.

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2014.10.03 04:38

2013 SSDM, Fukuoka, Japan

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2013 International conference on Solid State Devices and Materials (SSDM), Fukuoka, Japan

September 24-27, 2013 (Tuesday - Friday), Hilton Fukuoka Sea Hawk

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<Oral Session : K-5-1>

Tunable Bandwidth of Flexible Far-Infrared Filter using Metamaterial based Split-Ring Resonators

Hyunseung Jung and Hojin Lee

Abstract

In this paper, we present numerical and experimental studies of bandwidth tunable metamaterials using an overlap distance manipulation. Micro scale split-ring resonator (SRR) arrays were fabricated and characterized on the flexible polyimide films. We confirmed that the stop bandwidth of the fabricated far-infrared (Far-IR) filter can be tunable from 0.85 to 1.95 THz by longitudinal electric couplings between top and bottom SRRs as expected from simulation results.

 

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KIEEME 2021, Pyeongchang, Korea

June 30 - July 2, 2021 (Wed. - Fri.), Alpensia



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Wireless-Powered VOCs Sensor Based on Energy-Harvesting Metamaterial

Hojin Lee


Abstract


  Metamaterials, that can manipulate the electromagnetic (EM) waves and induce unique electromagnetic properties, have been explored as novel sensing platforms having superior sensing capabilities including high sensitivity, rapid sensing response, and high sensitivity owing to their high-quality resonance characteristics. However, most metamaterial-based gas sensor systems require bulky and complicated measurement system that limits real-time application.

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2012 SID Display Week, Boston, Massachusetts USA

June 5-8, 2012 (Tuesday - Friday), Boston Convention and Exhibition Center

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<Poster Session : P14>

a-IGZO TFT Based Pixel Circuits for AM-OLED Displays

Hyunseung Jung, Yongchan Kim, Youngseok Kim, Charlene Chen, Jerzy Kanicki, and Hojin Lee

Abstract

In this paper, we analyze application of amorphous Indium–Gallium–Zinc–Oxide thin film transistors (a-InGaZnO TFTs) to voltage-driven pixel electrode circuit that could be used for 4.3-in. wide video graphics array (WVGA) full color active-matrix organic light-emitting displays (AM-OLEDs). Simulation results, based on a-InGaZnO TFT and OLED experimental data, show that both device sizes and operational voltages can be reduced when compared to the same circuit using hydrogenated amorphous silicon (a-Si:H) TFTs. Moreover, the a-InGaZnO TFT pixel circuit can compensate for the threshold voltage variation (ΔVTH) of driving TFT within acceptable operating error range.

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