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2014 SPIE Optics + Photonics, San Diego, USA

August 17-21, 2014 (Sunday - Thursday), San Diego Convention Center

11.JPG


 

<Poster Session : 9160-100>

Anisotropy modeling of polarization dependent terahertz metamaterials

Hyunseung Jung and Hojin Lee

 

Abstract

We propose a novel anisotropy modeling of the polarization dependent meta-atoms at terahertz frequencies. The proposed anisotropic metamaterials are composed of metallic microstructures combined with various numbers of H-shaped meta-atoms. We confirm that the proposed metamaterials successfully realize the unique properties that can modulate the resonance frequency for the specific polarization of an incident wave, while can keep one identical resonance frequency for their orthogonal polarization direction, simultaneously. Moreover, regardless of the number of H-shaped meta-atoms as well as the polarization direction, their bandwidth can be kept identical by coupling effects between adjacent meta-atoms and their excited electric dipole moments.

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2014 iMiD, Daegu, Republic of Korea

August 26-29, 2014 (Tuesday - Friday), Daegu EXCO

iMiD 2014 DCIM.jpg





















<Oral Session : 41-1>

A Novel a-IGZO Pixel Circuit for AMOLEDs with Source Data Input

Daejung Kim, Yeonkyung Kim, Yongchan Kim, Heyoung Kang, and Hojin Lee


Abstract

In this paper, we proposed a novel voltage programmed pixel circuit with threshold voltage compensation. With the proposed pixel circuit, we achieved precisely controlled OLED currents against threshold voltage variations of driving TFT while the number of signal lines is reduced with the extended aperture ratio.


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2014.10.24 21:51

2014 SSDM, Tsukuba, Japan

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2014 SSDM, Tsukuba, Japan

September 8 - 11, 2014 (Mon - Thu), Tsukuba International Congress Center

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<Oral Session : B-3-7>

Synthetic Multi-Spectral Material Filter based on Terahertz Metamaterial Combined with Thin-Film Etalon Structure

Heyoung Kang, Hyunseung Jung and Hojin Lee

 

Abstract

In this paper, we demonstrate a numerical and experimental study of novel synthetic multi-spectral material (SMM) filters for visible and terahertz ranges. The proposed filter is based on double-layered complementary split ring resonators (CSRRs) combine with a thin-film etalon structure. The fabricated SMM filter can be fully the fabricated by conventional photolithography process to be confirmed to work as the transmissive color filter as well as the polarization dependent terahertz filter.

 

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2015 MRS Spring Meeting, San Francisco, USA

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

20150400.jpg

<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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2015 iMiD, Daegu, Republic of Korea

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

 

imid2015_H_Jung.jpg

 

<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.

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