• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 제37회 하계학술대회 논문집 C
• /
• pp.1330-1332
• /
• 2006

In the Langmuir-Blodgett (LB) technique, a monolayer on the water surface is transferred onto a substrate, which is raised and dipped through the surface. From this, multilayers can be obtained in which constituent molecules are periodically arranged. The LB technique has attracted considerable interest in the fabrication of electrical and electronic devices. Many researchers have investigated the electrical properties of monolayer and multiplayer films. Dendrimers represent a new class of synthetic macromolecules characterized by a regularly branched treelike structure. Multiple branching yields a large number of chain ends that distinguish dendrimers from conventional star-like polymers and microgels. The agobenzene dendrimer is one of the dendritic macromolecules that include the azo-group exhibiting a photochromic character. Due to the Presence of the charge transfer element of the azo-group and its rod-shaped structure, these compounds are expected to have potential interest in electronics and ptoelectronics, especially in nonlinear optics. In the present paper, we give pressure stimulation to organic thin films and detect the induced displacement current.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2004년도 추계학술대회 논문집 전기물성,응용부문
• /
• pp.209-211
• /
• 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.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2006년도 하계학술대회 논문집 Vol.7
• /
• pp.358-359
• /
• 2006

In the Langmuir-Blodgett (LB) technique, a monolayer on the water surface is transferred onto a substrate, which is raised and dipped through the surface. From this, multilayers can be obtained in which constituent molecules are periodically arranged. The LB technique has attracted considerable interest in the fabrication of electrical and electronic devices. Many researchers have investigated the electrical properties of monolayer and multiplayer films. Dendrimers represent a new class of synthetic macromolecules characterized by a regularly branched treelike structure. Multiple branching yields a large number of chain ends that distinguish dendrimers from conventional star-like polymers and microgels. The azobenzene dendrimer is one of the dendritic macromolecules that include the azo-group exhibiting a photochromic character. Due to the presence of the charge transfer element of the azo-group and its rod-shaped structure, these compounds are expected to have potential interest in electronics and ptoelectronics, especially in nonlinear optics. In the present paper, we give pressure stimulation to organic thin films and detect the induced displacement current.

• 한국광학회지
• /
• 제7권2호
• /
• pp.150-156
• /
• 1996

본 연구에서는 RWG MQW-LD가 weakly index-guided LD로 동작하기 위한 최적 걸게조건으로부터, 수직형 LPE장치를 사용하여 RWG MQW-LD를 제작하였다. 먼저 수회의 실험을 통해 MQW-DH웨이퍼를 photolithofraphy공정을 통해 폭이 4.mu.m인 ridge 패턴을 형성시켜 RWG MQW-LD를 제작하였으며 전기광학적 특성을 조사한 결과 I=2.7I$_{th}$ 이상에서도 측방향 단일모드 동작함을 알 수 있었다.

• 한국정밀공학회지
• /
• 제33권5호
• /
• pp.409-417
• /
• 2016

It is well known that Morpho butterflies show distinctive, brilliant and iridescent colors and have micro-nano scale structures, instead of dyes and pigments, on their wings. This structural coloration is regarded as a novel technique to express color with a long lifetime, ease and precise tenability. Here, we studied optical multilayer thin films with thickness of several tens of nm ($TiO_2$ and $SiO_2$) and lens-shape micro-patterns. Fabrication and characterization of the multilayer stacking structure and the micro-pattern structure were performed and the films were analyzed via several optical measuring techniques. Finally, we discussed how the micro-pattern structure could enhance independence with color changes according to the viewing angle.

• 한국산업융합학회 논문집
• /
• 제23권4_2호
• /
• pp.693-699
• /
• 2020

355nm UV pulse laser is irradiated on the surface of polyimide (PI) by LDW (Laser Direct Writing) method to produce a high sensitivity flexible humidity sensor using a simple one-step process. The LDW method continuously investigates 2-D CAD data using a galvano scanner and an F-lens. This method is non-contact, so it minimizes physical strain on the PI. Laser-induced graphene (LIG) produced by lasers has a high surface area due to its high flexibility and numerous pores and oxidizers compared to conductors. For this reason, it is highly useful as a flexible humidity sensor. The humidity sensor produced in this study was attached to the inside of a mask filter, which has become a hot topic recently, and its applicability was confirmed.The measurement of humidity measured the sensitivity, reactivity, stability and recovery behavior of the sensor by measuring changes in capacitance and resistance.

• 한국광학회지
• /
• 제1권1호
• /
• pp.65-72
• /
• 1990

최대 10kJ의 에너지를 공급할 수 있는 Mather형 플라즈마 집속장치를 설계, 제작하였다. 이 DPF 장치의 전기 방전 특성을 알기 위해 Rogowski 코일을 제작하고 방전전류, 전압을 측정하여 본 system 의 저항과 인덕턴스는 각각 $20m\Omega과 0.2{\mu}H로 밝혀졌다. 플라즈마 전류 sheath의 이동속도는 충전개스 압력과 전압에 따라 $P^{-0.25}\timesV^{0.38}$의 함수로 비례하며 집속된 플라즈마의 크기는 직경 3mm, 길이 17mm로 밝혀졌다.

• 한국광학회지
• /
• 제3권3호
• /
• pp.198-202
• /
• 1992

은 이온 교환법으로 만든 유리 도파로는 표면 굴절율 차가 크고 도파로 깊이가 얕기 때문에 반도체 박막 이식법을 이용한 반도체 소자와 유리 도파로의 혼성 집적에 사용되기에 적합하다. 이 노문은 묽게한 잘산화은 용액에서 이온 교환으로 만들어진 평면 및 채널 유리 도파로의 가시광선 및 적외선 파장영역에서의 특성을 보고한다. 특히 광통신에 중요한 파장인 1.5.$\mu$m에서의 단일 모우드 채널 도파로의 제작 조건을 결정하였다. 또한 여러가지 다른 구성 형태의 방향성 결합기가 제작되어 파장과 편광 방향에 따른 3dB 결합 길이가 결정되었다.

• Current Optics and Photonics
• /
• 제5권1호
• /
• pp.8-15
• /
• 2021

An elliptical zone plate (EZP) array is important in off-axis optical systems because it provides two advantages. First, the residual beam and the main source are not focused in the same direction and second, the light from the observation plane is not reflected back towards the beam source. However, the fill factor of the previous EZP array was about 76% which was a little low. Hence, this EZP array could not collect the maximum amount of illumination light, which affected the overall optical performance of the lens array. In this study, we propose a new EZP array design with a 97.5% fill factor used in off-axis imaging system for enhancement of brightness and contrast. Then, direct laser lithography was used to fabricate the high fill factor EZP array by moving the XY linear stage of the system in a zigzag motion. The imaging properties of the proposed EZP array were experimentally verified at the focal plane and compared with the previous model.

• Current Optics and Photonics
• /
• 제4권6호
• /
• pp.558-565
• /
• 2020

A wavelength-independent optical sensor based on an asymmetric Mach-Zehnder interferometer (AMZI) is proposed. The optical sensor based on an AMZI is very sensitive to wavelength, and wavelength drift will lead to measurement error. The optical sensor is compensated to reduce its dependence on wavelength. The insensitivity of the optical sensor to wavelength mainly depends on the compensation structure, which is composed of an AMZI cascaded with another AMZI and can compensate the wavelength drift. The influence of wavelength drift on the optical sensor can be counteracted by carefully designing the size parameters of the compensation structure. When the wavelength changes from 1549.9 nm to 1550.1 nm, the error after compensation can be lower than 0.066%. Furthermore, the effect of fabrication tolerance on compensation results is analyzed. The proposed compensation method can also be used to compensate the drift of other parameters such as temperature, and can be applied to the compensation of other interference-based optical devices.