• 한국광학회:학술대회논문집
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• 한국광학회 2004년도 제15회 정기총회 및 동계학술발표회
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• pp.222-223
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• 2004

• 한국광학회:학술대회논문집
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• 한국광학회 2008년도 동계학술발표회 논문집
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• pp.275-276
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• 2008

• 한국광학회:학술대회논문집
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• 한국광학회 2006년도 하계학술발표회 논문집
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• pp.435-436
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• 2006

• 한국전자통신학회논문지
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• 제15권1호
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• pp.39-44
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• 2020

유리기판위에 스퍼터링법으로 비정질 BaTiO₃막을 증착시켰다. 증착된 BaTiO₃ 막을 코로나 폴링을 하여 광학적 특성을 조사하였다. 가시광영역에서 투과율은 80% 이상으로 좋았으며, 비선형광학 특성은 폴링 조건에 따라 영향을 받으며, 크기는 1.15pm/V였다. 장기특성도 한달이 지나도 60%이상 유지하였다. 또한 BaTiO₃ 박막으로부터 녹색광 발생을 확인하였다.

• 한국세라믹학회:학술대회논문집
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• 한국세라믹학회 2003년도 추계총회 및 연구발표회 초록집
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• pp.232.2-232
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• 2003

• 한국광학회:학술대회논문집
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• 한국광학회 2003년도 하계학술발표회
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• pp.182-183
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• 2003

자체집광(Self-focusing)현상은 매우 높은 집적도를 가지는 광기록매체의 제작에 응용 가능하기 때문에 많은 연구자들에 의해 광범위하게 연구되어왔다. 그동안의 연구에서는 자체집광에 대한 분석방법으로서 빛살의 벡터특성을 무시한 비선형 슈뢰딩거 방정식(nonlinear Schr dinger equation)을 이용하였는데, 이 경우 축상으로 대칭적인 빛살이 입사될 때 발생되는 다중 필라멘테이션(Multiple Filamentation)현상은 입사빛살에 첨가되는 random noise에 기인한다는 것이 유일한 해석방법이었다. (중략)

• Macromolecular Research
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• 제15권1호
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• pp.59-64
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• 2007

Star-shaped, nonlinear optical (NLO) material was synthesized and its optical, thermal, and electro-optic properties were investigated. Three NLO-active dipolar chromophores containing a phenylene ring substituted with a bulky alkyl chain as a conjugation bridge were chemically bonded to the core of 1,1,1-tris(4-hydroxyphenyl)ethane to form a dendritic architecture. The chemical structure and purity of the chromophore were verified by NMR spectroscopy. The chromophore exhibited a broad absorption band centered at around 608 nm tailing up to 760 nm in toluene solution and also showed a discernible solvatochromic shift in more polar solvent. The chloroform solution of the dendrimer produced an absorption band with a red-shifted maximum as large as 28 nm when compared to that of the toluene solution. It was thermally stable up to $275^{\circ}C$ in a nitrogen atmosphere and had a glass transition temperature of $76^{\circ}C$. In a preliminary result, the polymer film containing the dendritic compound exhibited a shift of 19 pm/V taken at $1.55{\mu}$.

• Bulletin of the Korean Chemical Society
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• 제32권2호
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• pp.424-430
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• 2011

A novel T-type polyurethane 7 containing 1-(2,5-dioxyphenyl)-2-(5-(1,2,2-tricyanovinyl)-2-thienyl)ethenes as NLO chromophores, which constitute part of the polymer backbone, was prepared. Polyurethane 7 is soluble in common organic solvents such as DMF and DMSO. It shows a thermal stability up to $270^{\circ}C$ from TGA thermogram with $T_g$ value obtained from DSC thermogram near $155^{\circ}C$. The second harmonic generation (SHG) coefficient ($d_{33}$) of poled polymer film at 1560 nm fundamental wavelength is $3.56{\times}10^{-9}$ esu. Polymer 7 exhibits a thermal stability even at $5^{\circ}C$ higher than $T_g$, and no significant SHG decay is observed below $160^{\circ}C$, which is acceptable for nonlinear optical device applications.

• 한국전기전자재료학회논문지
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• 제23권6호
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• pp.491-496
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• 2010

The relaxation behavior of aligned electric dipoles in a mixed polymer of P2ANS with P(VDF-TrFE) is studied with optical second harmonic generation (SHG). In this work, a macroscopic noncentrosymmetry of the spin coated film was achieved by an electrical poling. The relaxation of induced polar order of nonlinear optic(NLO) chromophores after poling leads to an insufficient long-term stability of NLO properties. In this work, we develop a new technique to suppress such kind of dipole relaxation in a poled polymer. We found that the poled dipoles in a NLO polymer were effectively immobilized by the internal electric field created by a thermally annealed ferroelectric polymer. The long-term stability in a mixed system of NLO polymer/ferroelectric polymer was successively accomplished by a series of thermal treatments applied to the mixed polymer system at a temperature of $140^{\circ}C$ for at least 1hour after poling.

• ETRI Journal
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• 제18권2호
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• pp.75-86
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• 1996

A new method is proposed for the analysis of optical properties of stationary transverse electirc (TE) nonlinear waves in the five-layer waveguide which consists of a linear guiding layer with two nonlinear bounding layers sandwiched between a semi-infinite clad and a substrate. By using the relation of the interface electric fields, we obtain the generalized form of nonlinear dispersion equations as an analytic and flexible form. In order to verify the dispersion equation, we apply the dispersion equation to the analysis of the symmetric five-layer waveguide. The nonlinear dispersion curves for several thicknesses of the nonlinear thin film is also presented.