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Analysis of Guided-mode Resonant Grating Filters by Using a Rigorous Coupled-wave Method
Won Chegal,조현모,Yong Jai Cho,정해두 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
Guided-mode grating filters can be used as narrow-band reflection filters, narrow-band transmission filters and modulators. The characteristics of weakly- and strongly- modulated grating filters are analyzed by using a rigorous coupled-wave analysis (RCWA). The resonance of the subwavelength period filters shows double resonance peaks at near-normal incident angles in the weaklymodulated grating filters. In the case of strongly- modulated grating filters, double resonance peaks do not appear at near-normal incident angles. These strongly modulated grating filters are designed with different design parameters, such as grating depth and filling factor, to have either broad or narrow resonant spectral characteristics. The characteristics of the backward-diffracted wave (reflection wave) for TE-polarized waves are analyzed as functions of wavelength, grating depth and filling factor for different incident angles. Contour maps for strongly-modulated grating filters are shown for various grating depths and filling factors.
공기주입 장치와 공기제거 장치를 사용한 표면 플라즈몬 공명 타원계측기
이홍원,조은경,조재흥,원종명,신기량,제갈원,조용재,조현모,Lee, Hong-Won,Cho, Eun-Kyoung,Jo, Jae-Heung,Won, Jong-Myoung,Shin, Gi-Ryang,CheGal, Won,Cho, Yong-Jai,Cho, Hyun-Mo 한국광학회 2009 한국광학회지 Vol.20 No.3
완충용액과 분석시료의 확산으로 발생하는 측정 오차를 최소화하기 위하여 공기주입 장치와 공기제거 장치를 설치한 표면 플라즈 몬 공명 타원계측기(surface plasmon resonance ellipsometer: SPRE)를 새로이 제안하고 이를 제작하였다. SPRE에서 완충용액과 분석시료간의 상호 확산은 분석시료의 농도를 변화시켜 굴절률 측정에 영향을 주고, 이 결과 생체분자 물질의 접합 특성이 명확하게 나타나지 않는다. 이러한 SPRE의 측정 장치에 공기를 주입하는 장치를 추가로 설치하여 두 용액의 확산을 막고, 특히 불필요한 공기가 채널 내부로 유입되어 생기는 잡음신호를 없애기 위하여 공기제거 장치를 사용함으로써 신뢰성 있는 SPRE의 측정 결과를 얻을 수 있음을 확인하였다. The surface plasmon resonance ellipsometer (SPRE), using a multiple air injection system with an extraction of air system, has been proposed and developed to minimize measurement error of signals due to diffusion of reagent into running buffer. Since the diffusion of reagent into running buffer affects the refractive index of the running buffer by changing the concentration, characteristics of binding between various bio-molecules don't appear clearly in measurement results. The diffusion between running buffer and reagent can be blocked by using an air bubble injection system. An extraction of air system is used to remove the noise signal due to unnecessary air bubbles flowing in a channel. Reliability of measurement results has been improved by using the valve system.
Enhanced optical properties of co-growth WS₂/MoS₂ monolayer with plasmonic nanoparticles
Minji Park,Jaeseo Park,Won Chegal,Sang-Woo Kang 한국진공학회 2021 한국진공학회 학술발표회초록집 Vol.2021 No.2
We investigated the optical properties of co-growth WS<sub>2</sub>/MoS<sub>2</sub>-Ag nanoparticle (AgNP) hybrids by using photoluminescence (PL) and Raman spectroscopies. The co-growth WS<sub>2</sub>/MoS<sub>2</sub> were directly grown by using MOCVD. We formed locally and effectively a simple plasmonic structures composed of randomly disordered AgNPs. The AgNPs can be employed either for concentrating light or tuning to better match the exciton energy of 2D monolayers. We confirmed the PL and Raman of the hybrids were enhanced, indicating a stronger coupling and higher energy transfer rage between the AgNPs and co-growth WS<sub>2</sub>/MoS<sub>2</sub>
Cho, Yong Jai,Chegal, Won,Lee, Jeong Pyo,Cho, Hyun Mo Optical Society of America 2015 Optics express Vol.23 No.12
<P>We obtain the universal evaluations and expressions of measuring uncertainty for all types of rotating-element spectroscopic ellipsometers. We introduce a general data-reduction process to represent the universal analytic functions of the combined standard uncertainties of the ellipsometric sample parameters. To solve the incompleteness of the analytic expressions, we formulate the estimated covariance for the Fourier coefficient means extracted from the radiant flux waveform using a new Fourier analysis. Our approach can be used for optimization of measurement conditions, instrumentation, simulation, standardization, laboratory accreditation, and metrology.</P>