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Metamaterials 2022, Siena, Italy

September 12 - September 17, 2022 (Mon. - Sat.), Siena Univ.


KakaoTalk_20221111_165127778.jpg


Trans-Reflective Dual-Mode Terahertz Spatial Light Modulator Using Electrically Tunable Metasurface

Wonwoo Lee, and Hojin Lee


Abstract

  

Terahertz imaging systems have been extensively studied due to its high-resolution and non-destructive characteristics implementing the considerable potential for security inspection, bio-chemical material identification, and real-time imaging technologies. Despite remarkable progresses, conventional terahertz imaging systems require high power source, expensive detector, and complicate and time-consuming systems. In this regard, single-pixel imaging technique has been implemented into the terahertz range to realize compressive and real-time imaging. However, previous researches only allow the transmissive or reflective imaging technique owing to the passive or absorption type spatial light modulators (SLM). In this work, transmissionreflection dual-mode terahertz spatial light modulator is presented using electrically tunable metasurface based on ion-gel gating graphene metasurface. By applying differential driving voltage on the proposed SLM, differential respective object images could be successfully obtained simultaneously both for transmission and reflection mode exhibiting high correspondence with real objects.

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2018 SPIE Optics + Photonics, San Diego, United States

Aug 19 - 23, 2018 (Sun - Thu), San Diego Convention Center

 

 7.jpg

<Oral Session>

Electrically controlled terahertz funneling for electromagnetically induced transparency analogue

Hyunseung Jung, Hyunwoo Jo, Wonwoo Lee, Moon Sung Kangand Hojin Lee

 

 Abstract

In this study, we propose an electrically switchable funneling of terahertz waves for electrically induced transparency (EIT) analogue by actively controllable metamaterial. The proposed EIT metamaterials consist of the orthogonally combined metallic cut-wire (CW) pair and pseudo complimentary cut-wire (CCW), where graphene lines are laid on the center of pseudo-CCW to control the funneling of terahertz waves at the transmission resonance of the EIT structure by using ion-gel coplanar gating system. In experimental results, we successfully show the modulation depth of 54.9% and the group delay change by 1 ps at the transmission peak of our EIT analogue.

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2022.07.26 14:05

CLEO 2022, San Jose, USA

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CLEO 2022, San Jose, USA

May 16 - May 20, 2022 (Mon. - Fri.), McEnery Convention Center


CLEO 이.jpg


Transmission-Reflection Terahertz Spatial Light Modulator Using Electrically Tunable Dual-Mode Metamaterial

Wonwoo Lee, Hyunwoo Jo, Moon Sung Kang, and Hojin Lee


Abstract


  Terahertz imaging system has been extensively studied due to its high-solution and non-destructive characteristics implementing the considerable potential for security inspection, bio-chemical material identification, and real-time imaging technologies. Despite remarkable progresses, conventional terahertz imaging system requires high power source, expensive detector, and complicate and time-consuming systems. In this regard, single-pixel imaging technique has been implemented into the terahertz range to realize compressive and real-time imaging. However, previous researches allow the only transmissive or reflective imaging techniques owing to the passive or absorption type spatial light modulators (SLM). In this work, transmission-reflection terahertz spatial light modulator is presented using electrically tunable dual-mode metamaterial. By applying differential driving voltage on SLM, differential respective object images could be successfully obtained both for transmission and reflection mode exhibiting high correspondence with real objects based on dual-mode terahertz single-pixel imaging system.

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2017 META '17, Incheon, Korea

July 25 - 28, 2017 (Tue - Fri), Songdo Convensia

 

ba58489db1e3a24d7a9fffcff5feaa9e.jpg

 

 

<Poster Session>

Electrically reconfigurable terahertz meta-molecules

Hyunseung Jung, Jaemok Koo, Wonwoo Lee, Chihun In, Hyunyong Choi, Moon Sung Kang, and Hojin Lee

 

 Abstract

In this study, w In this study, wIn this study, w In this study, w In this study, w In this study, w In this study, wIn this study, w In this study, we propose an intriguing metamaterial design method to achieve actively customized tuning of terahertz resonance properties. The proposed metamaterial devices are based on the inter-atomic bonding of meta-atoms, which is referred as ‘moleculization’ of meta-atoms, and realized by controlling the conductance of interconnected graphene bridges. Based on the numerical and experimental results, we confirm that the proposed moleculization system successfully exhibits a broad tuning range of resonance frequency in terahertz regime.

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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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