• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2006년도 하계종합학술대회
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• pp.549-550
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• 2006

It has become topic continuously at MEMS or semiconductor process to form three-dimensional multilayer structure. In this paper, we devised the new polymer pattern method that has multilayer structure. This is method that uses different kind of polymeric material. Specially, polymers used in this study that we propose became all pattern by photolithography, prevented that process increases. Here, polymer that we use used polymer of epoxy order called "SU-8" and polymer of novolak resin called "AZ-1518". The result, "SU-8" was formed pattern to 3.5um thickness, and "AZ-1518" about pattern 3um thickness. Also, It was been 6um thickness at same pattern area.

• ETRI Journal
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• 제24권4호
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• pp.259-269
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• 2002

Polymers are emerging as new alternative materials for optical communication devices. We developed two types of polymer-based devices for optical communications. One type is for ultra high-speed signal processing that uses nonlinear optical (NLO) polymers in such devices as electro-optic (EO) Mach-Z${\ddot{e}} $ hnder (MZ) modulators and EO 2${\times}$2 switches. The other is for WDM optical communications that use low-loss optical polymers in such devices as 1${\times}$2, 2${\times}$2, 4-arrayed 2${\times}$2 digital optical switches (DOSs) and 16${\times}$16 arrayed waveguide grating (AWG) routers. For these devices, we synthesized a polyetherimide-disperse red 1 (PEI-DR1) side chain NLO polymer and a low-loss optical polymer known as fluorinated polyaryleneethers (FPAE). This paper presents the details of our development of these polymeric photonic devices considering all aspects from materials to packaging.

• Macromolecular Research
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• 제13권4호
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• pp.362-365
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• 2005

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.1133-1135
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• 2009

The rolls of triplet excitons in a polymer based photovoltaic (PV) device are investigated for improving the efficiency of PV devices. Generally, the thick photo-absorbing layer can improve the PV device efficiency by increasing the photon absorption. However, in case of PV devices with singlet excitons, the efficiency is limited by the short exciton diffusion length, which depends on the mobility and lifetimes of excitons. Therefore, using the triplet excitons, which have a higher mobility and longer lifetime, can solve the problem of premature exciton dissociation caused by the shorter singlet exciton diffusion length in the thick photo-absorbing layer. In this study, the triplet exciton dynamics of a conjugated polymer in a phosphorescent dye blended polymer PV device is investigated by photo-induced absorption, and PV devices performance at various concentrations of phosphorescent dye are is also evaluated.

• 한국광학회지
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• 제19권3호
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• pp.187-192
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• 2008

실리콘과 전광 고분자 물질을 기반으로 한 새로운 광 결정 광변조기를 제안하고, 설계 및 검증을 수행하였다. 이는 실리콘 물질로 된 광 결정 도파로의 중심에 전광 고분자 물질로 된 슬롯 형태의 도파로를 삽입한 구조로 구성된다. 좁은 폭의 전광 고분자 슬롯도파로를 진행하는 광 신호는 주변의 광 결정 구조에 의해 매우 낮은 군속도를 갖게 될 뿐만 아니라, 전광 고분자 내로의 강한 광학적 구속력을 갖게 되어 광-물질 간의 활발한 상호작용과 매우 높은 전기-광학적 효과를 얻을 수 있다.

• 한국광학회지
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• 제24권4호
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• pp.184-188
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• 2013

본 논문에서는 스마트 홈 네트워크, 자동차용 광네트워크, 선박용 광네트워크 등의 멀티모드 광네트워크 구성을 위한 멀티모드 광분배기를 제작하였다. 멀티모드 광분배기는 폴리머 기반의 자외선 임프린트(ultra violet imprint, UV-imprint) 공정에 의해 $200{\mu}m$ 코어 사이즈를 갖는 대구경으로 제작하였으며, 신호 분기를 위한 1:1 균등 분배기 및 네트워크 모니터링을 위한 9:1 비균등 분배기를 제작하였다. 대구경 광분배기를 제작하기 위해 실리콘 웨이퍼에 Bosch process에 의한 광분배기 패턴을 식각하여 imprint 마스터를 제작 후 폴리디메틸실록산(polydimethylsiloxane, PDMS)를 이용한 탄성체 몰드를 역상 복제 하였다. 역상 복제된 PDMS 몰드를 이용해 UV-imprint 공정에 의한 대구경 광분배기 칩을 제작하였다. 또한, 폴리메틸메타크릴레이트(polymethylmethacrylate, PMMA) 광섬유 블록을 제작하고 광분배기 칩의 입출력 단에 광섬유를 정렬 부착하여, 최종적으로 광분배기는 광분배기 칩과 패키징을 위한 광섬유 블록을 폴리머 기반의 저가형으로 제작하였다. 제작된 폴리머 기반 광분배기의 도파손실, 삽입손실 및 출력 균일도를 측정하고, 내환경 특성 평가를 위해 $-40^{\circ}C{\sim}+60^{\circ}C$ 주기의 temperature cycling test 후 삽입손실 변화를 측정하였다.

• Bulletin of the Korean Chemical Society
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• 제26권2호
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• pp.201-214
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• 2005

We have designed and developed novel luminescent lanthanide complexes for advanced photonics applications. Lanthanide(III) ions (Ln$^{3+}$) were encapsulated by the luminescent ligands such as metalloporphyrins and naphthalenes. The energy levels of the luminescent ligands were tailored to maintain the effective energy transfer process from luminescent ligands to Ln$^{3+}$ ions for getting a higher optical amplification gain. Also, key parameters for emission enhancement and efficient energy transfer pathways for the sensitization of Ln$^{3+}$ ions by luminescent ligands were investigated. Furthermore, to enhance the optophysical properties of novel luminescent Ln$^{3+}$ complexes, aryl ether-functionalized dendrons as photon antennas have been incorporated into luminescent Ln$^{3+}$ complexes, yielding novel Ln(III)-cored dendrimer complex. The novel Ln(III)-cored dendrimer complex has much higher PL intensity than the corresponding simple complex, due to the efficient site-isolation effect. In this article, we will deal with recent progress in the synthesis and photophysical studies of inert and stable luminescent Ln$^{3+}$ complexes for advanced photonics applications. Also, our review will include the exploratory investigation of the key parameters for emission enhancement and the effective energy transfer pathways from luminescent ligands to Ln$^{3+}$ ions with Ln(III)-chelated prototype complexes.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1353_1354
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• 2009

The OTFT devices had inverted staggered structures of Au/pentacene/ppMMA/ITO on PET substrate. The overall device performances of the flexible devices such as the operating voltage, the field effect mobility, the on/off ratio and the off current are somewhat worse than those of devices fabricated on glass substrates. Pentacene/ppMMA OTFT benchmarks (mobility, sub-threshold slope, on/off ratio) were comparable to that of solution cast PMMA, but below average when compared to other polymer gate dielectrics. However, threshold and drive voltages were among the lowest reported for a polymer gate dielectric, and surpassed only by ultra-thin SAM gate dielectrics.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.954-957
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• 2007

We analyzed conditions for fabricating zero-bias polymer-stabilized liquid crystal (PSLC) pi cells. A high curing voltage and a very low curing intensity are effective in fabricating the cell with a high bright state, a low dark state and therefore a steep T-V curve. However, the response time of the cell is slow. Finally, a dual-frequency PSLC pi cell with fast response time is developed. The obtained result reveals that the dual-frequency PSLC pi cell has a fast response of under 1ms.

• 한국광학회지
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• 제22권4호
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• pp.179-183
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• 2011

근적외선 대역에서 동작 가능한 가변파장레이저 구현을 위하여 브래그 격자와 반도체 광증폭기로 구성된 외부 공진기 형태의 레이저를 제작하였다. 폴리머 광도파로는 굴절률이 1.462, 1.435 인 ZPU 폴리머를 이용하여 제작되었다. 근적외선 파장에서 반사를 일으키는 브래그 격자의 제작을 위해서는 주기가 875 nm 로서 비교적 크고 제작이 손쉬운 3차 브래그 격자를 이용하였다. 폴리머 광도파로 브래그 반사기를 이용하여 제작된 근적외선 외부공진 레이저는 850 nm 파장에서 0 dBm의 출력 파워와 0.2 nm의 20-dB bandwidth, 40 dB 이상의 Side Mode Suppression Ratio을 가지는 단일 모드 레이저 특성을 보였다.