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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2022.07.26 14:08

CLEO 2022, San Jose, USA

조회 수 976 추천 수 0 댓글 0
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CLEO 2022, San Jose, USA

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


CLOE 조.jpg


Patch-Type Wireless Power Transfer System Based on Electromagnetic Wave Focusing Meatasurface for Bioimplantable Devices

Semin Jo, Wonwoo Lee, and Hojin Lee


Abstract


  Bioimplantable devices require miniaturization, stability, and long-term operation characteristics for electroencephalogram (EEG) monitoring and stimulation within the human body. Generally, batteries have been widely used in bioimplantable devices due to the stable power supply capability. However, bioimplantable devices using batteries have challenges in bulky size, limited lifetime, and need for replacement that essentially requires surgical method. To overcome aforementioned challenges, wireless power transfer (WPT) have attracted attention as an alternative approach to avoid the surgical procedure. Nevertheless, the stable and sustainable wireless power supply to bioimplantable devices still remains as the challenge due to the low WPT efficiency. Recently, WPT systems using metasurfaces exhibiting exotic electromagnetic (EM) characteristics were introduced in bioimplantable devices to enhance the efficiency and to reduce the geometrical dimension. In this work, we propose a novel patch-type WPT system using EM wave focusing metasurface. In contrast to previous approaches, the proposed metasurface enables to enhance the transmitted power intensity of EM wave by forming a focal point at a specific location into the tissue. Through the in-vitro experiment, the maximum voltage enhancement was confirmed at a desired depth of 10 mm in saline solution that mimics the actual tissue characteristics.

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2019.06.20 19:35

CLEO 2019, San Jose, CA, USA

조회 수 1006 추천 수 0 댓글 0
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CLEO 2019, San Jose, California, USA

May 10 - 15, 2019 (Mon. - Fri.), San Jose Convention Centor


KakaoTalk_20190620_192840901.jpg


Terahertz Single-Pixel Imaging System with Electrically Tunable Metamaterial Spatial Light Modulator

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


Abstract


  Due to its penetrability and straightness of terahertz wave, terahertz imaging system has been extensively studied for real-time, high-resolution and accurate imaging systems. However, these imaging systems require high power sources or expensive and complex detectors and usually take a long time to acquire a single image. To overcome the limitations mentioned before, a single-pixel imaging system that had been used in optical imaging technique has been introduced into the terahertz range. In particular, through a single-pixel imaging system, it is possible to construct a terahertz imaging system using only a lamp and a bolometer detector instead of telescopic systems consisting of hundreds of terahertz parts, which gives great possibility for commercialization. In this work, we present electrically tunable terahertz spatial light modulator (SLM) based on ion-gel gating graphene metamaterials. From experimental results, we confirmed that the terahertz image could be successfully reconstructed corresponding to 93 % with the real object image at maximum.


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2024.10.30 13:53

AMSM 2024, Incheon, Korea

조회 수 433 추천 수 0 댓글 0
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AMSM 2024, Incheon, Korea

October 27 - October 30, 2024 (Sun. - Wen.), Songdo ConvensiA


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Silicone-Integrated Photolithography for Ultra High-Resolution Organic Photodiodes in Augumented/Virtual Reality Applications


Ryungyu Lee, Keun-Yeong Choi, Hyukmin Kweon, Do Hwan Kim and Hojin Lee


Abstract


Organic photodiodes are ideal for advanced flexible electronic applications such as imaging and video photography due to their tunable photophysical properties, low-cost and simple processing methods, and continuously improving performance. In particular, the simple design and thin thickness of organic material-based devices enable the control of optical and geometrical crosstalk, garnering attention for application in image sensors. Utilizing these organic photodiodes in image sensors necessitates their integration into high-density arrays. This approach is essential for achieving the precise and effective performance required for advanced imaging applications. However, the absence of precise pixelation techniques capable of implementing organic light-emitting semiconductor with high production and reliability has limited the realization of high-density organic photodiodes. In this paper, we present a silicone engineered anisotropic lithography of the organic light-emitting semiconductor (OLES) that in-situ forms a non-volatile etch blocking layer during reactive ion etching. This unique feature not only slows the etch rate but also enhances the anisotropy of etch direction, leading to gain delicate control in forming ultrahigh-density multicolor OLES patterns (minimum line width of 2µm) through photolithography. This patterning strategy inspired by silicon etching chemistry is expected to provide new insights into high-density organic photodiodes. Furthermore, the proposed system is expected to be applicable to flexible substrates, extending its use to soft sensor applications such as artificial eyes.

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2024.10.30 14:17

AMSM 2024, Incheon, Korea

조회 수 73 추천 수 0 댓글 0
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AMSM 2024, Incheon, Korea

October 27 - October 30, 2024 (Sun. - Wen.), Songdo ConvensiA


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Electromagnetic Energy Focusing Single-Layer Metasurface for Powering Small Unmanned Vehicle
Wonwoo Lee, Kyungbin Cho, Sanghyun Park, and Hojin Lee


Abstract


Organic photodiodes are ideal for advanced flexible electronic applications such as imaging and video photography due to their tunable photophysical properties, low-cost and simple processing methods, and continuously improving performance. In particular, the simple design and thin thickness of organic material-based devices enable the control of optical and geometrical crosstalk, garnering attention for application in image sensors. Utilizing these organic photodiodes in image sensors necessitates their integration into high-density arrays. This approach is essential for achieving the precise and effective performance required for advanced imaging applications. However, the absence of precise pixelation techniques capable of implementing organic light-emitting semiconductor with high production and reliability has limited the realization of high-density organic photodiodes. In this paper, we present a silicone engineered anisotropic lithography of the organic light-emitting semiconductor (OLES) that in-situ forms a non-volatile etch blocking layer during reactive ion etching. This unique feature not only slows the etch rate but also enhances the anisotropy of etch direction, leading to gain delicate control in forming ultrahigh-density multicolor OLES patterns (minimum line width of 2µm) through photolithography. This patterning strategy inspired by silicon etching chemistry is expected to provide new insights into high-density organic photodiodes. Furthermore, the proposed system is expected to be applicable to flexible substrates, extending its use to soft sensor applications such as artificial eyes.

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