• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.04b
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• pp.139-142
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• 2000

Displacement current was generated in the light stimulus. Solution of azobenzene molecules (8A5H) have to character trans-to-cis. The Maxwell displacement current measuring technique has been applied for the investigation of azobenzene organic thin films under alternating photoirradiation with ultraviolet($\lambda_1$) and visible($\lambda_2$) light. also, As laser beam(630~670nm) investigate light response. As result, ultraviolet($\lambda_1$) and visible($\lambda_2$) light see photoisomerization response, but laser beam not appear photoisomerization in current that differ wave range reagent.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.07a
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• pp.495-498
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• 2000

In this paper, generation form of displacement current was compared and measured with air-water interfacing induce monolayers which 8A5H with azobenzene and arac.acid mixed. Light response of two monolayers which chain length are different was compared and measured though they are the same isomer. The experimental results are as following; In the displacement current form of mixed monolayers and 8A5H, mixed monolayers which chain length is longer than that of 8A5H caused the displacement current about 40[fA] mole. This is the reason chain length of hydrophobicity in mixed monolayers is longer than that of 8A5H In the case of light stimulus mixed monolayers reacted less than 8A5H about 9[fA]. This is the reason molecule dynamic behaviour in cia and trans was net activated due to its very long chain length.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2000.11a
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• pp.283-286
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• 2000

In this paper, generation form of displacement current was compared and measured induce monolayers which 8A5H with Pure azobenzene. Light response of two monolayers which compared and measured though they are the same isomer. The experimental results are as following; In case of ultraviolet($\lambda_1$) and visible($\lambda_2$) irradiation on 8A5H induce monolayers depositioned on board the peak of current was detected about 10[fA]. but light irradiation on pure azobenzene any particular reaction for detailed. This is the reason of hydrophobicity construct in molecule structures its molecule dynamic behaviour in cis and trans was not due to activated.

• Proceedings of the KIEE Conference
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• 1999.07d
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• pp.1971-1973
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• 1999

Monolayers of azo-benzene group containing fatty acids(8A5H) were made by spreading and compressing on the water surface. These monolayers were optically stimulated by illuminating the lights of 365[nm] and 450[nm] from X-non lamp, and the structural changes of the molecules were measured by the displacement current method. Also, the dynamic behaviors of these monolayers were measured by the $\pi-A$ isotherms when changing the temperatures of the water surface. As results, when the monolayers were stimulated by 365[nm] light, the positive currents which were generated by the structural changes from trans to cis were measured. But the negative currents of the structural changes from cis to trans were too weak to detect. When the temperatures of the water surface were increased, surface pressures of the monolayers increased early because of the thermal activations of the molecules, and the double liquid film phase were disappeared upon $40[^{\circ}C]$.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.05a
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• pp.41-44
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• 1999

Displacement current was generated in the pressure stimulus and light stimulus. Solution of azobenzene molecules (8A5H) have to character trans-to-cis. Pressure stimulus generate in the pressure and current. light stimulus generate in the displasement current. The Maxwell displacement current measuring technique has been applied for the investigation of azobenzene organic thin films under alternating photoirradiation with ultraviolet(360nm) and visible (450nm) light. The displacement current was generated due to the trans-to-cis photoisomerization by irradiation with ultraviolet light(λ$_1$=360 nm) Whereas the displacement current was generated in the opposite direction due to the cis-to-trans photoisomerization by irradiation with visible light(λ$_2$=450nm). As result, To show twice reaction certainly phase transition in pressure. A first range generated from 24$\AA$$^2$ to 29$\AA$$^2$and second range generated from 20$\AA$$^2$to 24$\AA$$^2$. Also, cetainfy stimulus apper low pressure and high pressure in photoirradiation. To see different every moment phase transition.

• Proceedings of the KIEE Conference
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• 2004.11a
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• pp.209-211
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• 2004

In the Langmuir-Boldgett(LB) technique, a monolayer on the water surface is transferred on to a substrate, which is raised and dipped through the surface, and one can obtain multilayers in which constituent molecules periodically are arranged in layer. The LB technique has attracted considerable interest in the fabrication of electrical and electronic device, e.g.. Many researchers have investigated the electrical properties of monolayer and multiplayer films. Dendrimers represent a new class of synthetic macromolecules sharacterized by a regularly branched treelike structure. Multiple branching yields a large number of chain ends, which distinguishes dendrimers from conventional starlike polymers and microgels. Azobenzene dendrimer is one of the dendritic macromolecules that includes the azo-group which exhibits a photochromic character. Due to the presence of the charge transfer part, the azo-group, and having a rod-shaped structure, these compounds are expected to have the potential interest in electronics and ptoelectronics, especially in nonlinear optics. In the present paper, we give a pressure stimulation into organic thin films and detect the induced displacement current.

• Electronics and Telecommunications Trends
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• v.26 no.3
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• pp.71-87
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• 2011

2004년 MIT 10대 신기술, 2005년 일본 총무성 10대 기간 기술로 선정된 테라헤르츠 기술 개발에 집중적인 연구개발이 진행되고 있다. 물질의 투과, 낮은 광자에너지로 식품, 인체에 상대적으로 안전하여 인간에 필요한 테라헤르츠 영상이나 인간에 유해한 물질을 추출하기 위한 테라헤르츠 분광기술에 관한 많은 가능성들을 제시하여 왔다. 또한, 영상 및 분광 이외에도 유무선 경계가 희박해지고 있는 시점에서 유무선 통합 기능제공이 가능하고 정보전달, 센싱, 비파괴 검사 등 다양한 응용영역으로 기술수요가 급격히 증가하고 있는 실정이다. 수요기술의 핵심은 언제, 어디서나, 실시간, 무고통으로 값싸게 활용하여 풍요롭고 안전한 삶을 유지하는 것으로 고령화 사회의 핵심 인프라 구축과 연동되어 가치를 공유하고 있다. 전자기파 대역에서의 초소형, 고효율, 실시간, 저가격 파원 및 검출기 기술개발의 장점을 갖는 포토닉스 기반 테라헤르츠 기술 동향에 대해 기술하였다.