• 한국전자통신학회논문지
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• 제10권1호
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• pp.133-138
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• 2015

편광유지 광결정 광섬유를 이용하여 무게센서를 제작하여 실험을 하였다. 본 논문의 센서시스템은 3 dB 커플러, 반파장판, 광원으로 구성되어진다. 무게가 편광유지 광결정 광섬유에 가해지면 파장이동을 측정한다. 센서감지부로 원형형태와 직선형태의 2 종류로 제작하여 특성을 조사하였다. 직선형태로 이루어진 센서의 감도는 680 pm/kg 였으며, 원형형태로 구성된 센서의 감도는 270 pm/kg 이었다. 두 가지 형태로 제작된 센서는 선형성이 좋았으며, 감도는 직선형태로 이루어진 센서가 좋음을 알 수 있었다.

• 한국전자파학회:학술대회논문집
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• 한국전자파학회 2003년도 종합학술발표회 논문집 Vol.13 No.1
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• pp.450-453
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• 2003

In this paper, the miniaturization of linear polarization microstrip patch antenna is studied by attached Irises near the square linear polarization microstrip patch antenna which are induced the increase of current path. Microstrip patch antenna having the Irises is designed and fabricated at the resonant frequency of 1.575 GHz. The result is like that the resonant length of patch is reduced 41.5 mm which correspond to 50.9 % of that of plane type(81.5mm). The return loss is -28.5 dBd and -10 dB bandwidth is 103 MHz( 6.5 %). And as the radiation pattern is broad through the size reduction of patch, the gain is 5.9 dBd and -3 dB beamwidth of E-plane is $111.9^{\circ}$.

• Bulletin of the Korean Chemical Society
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• 제24권8호
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• pp.1126-1134
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• 2003

The signals obtained from the $5^{th}$-order (two-dimensional) Raman spectrum of a liquid can depend dramatically on the polarizations of the various light beams, but to date there has been no evidence presented that different polarization conditions probe any fundamentally different aspects of liquid dynamics. In order to explore the molecular significance of polarization we have carried out a molecular dynamics simulation of the $5^{th}$-order spectrum of a dilute solution of CS₂ in liquid Xe, perhaps the simplest system capable of displaying a full range of polarization dependencies. By focusing on the 5 distinct rotational invariants revealed by the different polarizations and by comparing our results with those from liquid Xe, a liquid whose spectrum has no significant polarization dependence, we discovered that the polarization experiments do, in fact, yield valuable microscopic information. With different linear combinations of the experimental response functions one can separate the part of the signal derived from the purely interaction-induced part of the many-body polarizability from the portion with the largest contributions from single-molecule polarizabilities. This division does not directly address the underlying liquid dynamics, but it significantly simplifies the interpretation of the theoretical calculations which do address this issue. We find that the different linear combinations differ as well in whether they exhibit nodal lines. Despite the absence of nodes with the atomic liquid Xe, observing the resilience of our solution's nodes when we artificially remove the anisotropy of our solute leads us to conclude that there is no direct connection between nodes and specifically molecular degrees of freedom.

• Bulletin of the Korean Chemical Society
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• 제24권8호
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• pp.1102-1106
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• 2003

In our previous work we developed the Finite Field method in order to calculate the fifth-order Raman response. The method was applied to calculate various polarization components of the two-dimensional response of liquid $CS_2$. So far, all calculations relied on the dipole-induced dipole. Accurate time-dependent density functional theory calculations have shown that this model has big discrepancies, when molecules are close together as in the liquid. We now report results of investigations on the importance of multipole and electron overlap effects on the polarizability and the fifth-order Raman response. It is shown that these collision effects, especially the induced multipoles, are crucial in the description of the fifth-order response. The impact is found to be especially pronounced for the χ_{mmzzzz}^{(5)}$response that is solely due to interaction induced effects. The calculated response will be compared with various experimental results.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.623-624
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• 2009

Here we report a photo polymerization-induced hybrid alignment of a nematic liquid crystal cell which can be applied for a roll to roll fabrication process. Predominant polymerization in the vicinity of UV incident front induced a diffusion of monomers toward front slide and anisotropic polymer network was formed parallel to the polarization direction of the UV light. This induced planar alignment of liquid crystals at the front slide. Simultaneously, homeotropic alignment was induced at the bottom slide as the polymers are phase-separated from a bottom slide.

• 한국광학회지
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• 제34권6호
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• pp.241-247
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• 2023

본 연구에서는 355 nm 파장의 나노초 레이저를 비정질 실리콘 박막에 조사하여 형성된 주기적 laser-induced periodic surface structure (LIPSS) 구조의 분광학적 특성을 연구하였다. 지름 196 ㎛의 가우시안 빔을 단위면적당 레이저 펄스 190-280회, 레이저 빔의 세기는 100-130 mJ/cm² 범위에서 'ㄹ' 자 형태로 2차원 스캔하였다. 그 결과 Si 박막 표면에 ~300 nm 주기의 LIPSS 구조가 레이저 편광에 수직 방향으로 정렬되었다. 시료의 투과율 스펙트럼을 측정하여 transverse-electric 편광과 transverse-magnetic 편광에 대해서 각각 700 nm, 500 nm 근방에서 dip이 관측되었다. 이 현상을 설명하기 위해 1차원 격자구조 모델을 이용하여 rigorous coupled-wave analysis를 이용한 시뮬레이션을 하여 편광에 따른 도파모드 공진에 의한 특성임을 규명하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1998년도 추계종합학술대회 논문집
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• pp.371-374
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• 1998

The Scattering of arbitrarily shaped gratings covered with dielectric slab is considered. The total field in each region is expressed in terms of incident field and scattered field by induced currents on the surface of the grating. Some numerical results is presented nd compared with previous ones in cases of several gratings.

• Bulletin of the Korean Chemical Society
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• 제24권1호
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• pp.113-115
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• 2003

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2008년도 Asian Magnetics Conference
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• pp.219.2-219.2
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• 2008

• 한국정보기술학회논문지
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• 제16권11호
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• pp.77-84
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• 2018

본 논문에서는 T-junction 전력 분배기를 이용한 원형 편파 마이크로스트립 패치 안테나를 제안하였다. 제안된 안테나의 동작 주파수는 2.4GHz의 ISM 대역이며, 패치 안테나의 두 가장자리에 $90^{\circ}$의 위상차를 급전하여 원형 편파를 유도하였다. 안테나의 구조는 일반적인 패치 안테나와 T-junction 전력 분배기로 구성된다. 안테나의 최적화를 위해 반사계수, 축비, 방사패턴 등이 분석된다. 안테나의 임피던스 대역폭은 2.39~2.43GHz 대역에서 40MHz의 대역폭이 관찰되었으며, 축비 대역폭은 2.398~2.410GHz 대역에서 약 12MHz의 대역폭이 관찰되었다. 안테나의 방사패턴은 우회전 원형 편파로 동작하였다. 또한 안테나의 이득은 XZ 및 YZ-평면에서 각각 2.04, 3.4㏈ic가 관찰되었다.