• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.II
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• pp.1351-1354
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• 2005

We report on the photoalignment process of pentacene thin film with optical anisotropy on treated buffer layers. The photopolymer, showing an anchoring transition, was used as a buffer layer to control the structural order of the pentacene molecules. Using the photoelastic modulator, it was found that the grain size and the optical anisotropy of the pentacene thin film were strongly correlated with each other.

• 한국광학회지
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• 제15권6호
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• pp.531-538
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• 2004

균일한 표면에서 일어나는 가파른 계단형식의 흡착에 대한 연구는 이차원 현상에 대한 이해를 한층 높일 수 있다. 이를 위해 편광변조 타원해석법을 이용한 흡착측정장치를 제작하였다. 타원해석법 신호가 흡착막 형성의 과정을 원자층 이하 (∼0.3 $\AA$)로 매우 예민하게 측정할 수 있음을 확인할 수 있었다. HOPG (highly oriented pyrolytic graphite) 표면에서의 아르곤의 흡착 다층막을 측정한 결과, 34.04 K에서는 수천여개의 흡착층이 형성되어 완전 젖음이 일어남을 관찰할 수 있었다. 또한 67.05 K에서는 선명한 계단 형식으로 일어나는 9개의 흡착과 탈착을 확인할 수 있었다. 이에서 얻은 등온흡착곡선들은 많은 열역학적 상태에 관한 정보, 표면과 기체의 결합에너지에 대한 정보, 흡착막의 구조전이에 대한 정보 등을 줄 수 있을 것이다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.251-251
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• 2012

A lot of studies are undergoing on the magneto-optical (MO) properties of patterned magnetic systems for the reason that they have potential application to information technology such as ultrahigh-speed computing. Moreover, they can be considered as the future candidates for high-density MO storage devices. Not only the technical aspects, but there have been also tremendous interests in studying their properties related to the fundamental physics. The MO Kerr-rotation effects (both in reflected and the diffracted modes) and the magnetic force microscopy (MFM) are very useful techniques to investigate the micromagnetic properties of such periodic structures. Hence, in this study, we report on the MO properties of bilayered Cobalt (Co)/ nickel (Ni) micro-patterned anti-dot arrays. Such a ferromagnetic structure was made by sequentially depositing co (40 nm)/Ni (5 nm) bilayer on a Si substrate. The anti-dot patterning with hole diameter of $1{\mu}m$ was done only on the upper Co layer using photolithography technique, while the Ni underlayer was kept uniform. The longitudinal Kerr rotation (LKR) of the zeroth- and the first-order diffracted beams were measured at an incidence of $30^{\circ}$ by using a photoelastic modulator method. The external magnetic field was applied perpendicularly to the reflected and the diffracted beams using an electromagnet capable of a maximum field of ${\pm}5$ kOe. Significantly, it was observed that the LKR of the first-order diffracted beam is nearly 4 times larger than that of the zeroth-order beam. The simulated results for the hysteresis loops matched qualitatively well with the experimentally obtained ones. In conjunction with the LKR, we also investigated the magnetic-domain structure by using a MFM system, which were analyzed to elucidate the origin of the enhanced MO rotation.