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폴리머 광도파로를 이용한 집적형 표면 플라즈몬 공명 센서
오금윤(Geum-Yoon Oh),김두근(Doo-Gun Kim),김홍승(Hong-Seung Kim),이태경(Tae-Kyeong Lee),최영완(Young-Wan Choi) 대한전기학회 2012 전기학회논문지 Vol.61 No.3
We propose a novel micro surface plasmon resonance (SPR) sensor system based on polymer materials. The proposed SPR system consists of the incident medium with polymer waveguide and the gold thin film for sensing area. Using a polymer optical waveguide instead of a prism in SPR sensing system offers miniaturization, low cost, and potable sensing capability. The whole device performance was analyzed using the finite-difference time domain method. The optimum gold thickness in the attenuated total reflection mirror of polymer waveguide is around 50 nm and the resonance angle to generate surface plasmon wave is 68 degrees.
김두근,김홍승,오금윤,김선훈,기현철,김태언,김회종,최영완,Kim, Doo Gun,Kim, Hong-Seung,Oh, Geum-Yoon,Kim, Seon-Hoon,Ki, Hyun-Chul,Kim, Tae-Un,Kim, Hwe Jong,Ma, Ping,Hafner, Christian,Choi, Young-Wan 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.3
We have investigated the optical properties of plamonic waveguide with tapered structure based on InP material for photonic integrated circuit(PIC). The proposed plasmonic waveguide is covered with the Ag thin film to generate the plasmonic wave on metallic interface. The optical characteristics of plasmonic waveguide were calculated using the three-dimensional finite-difference time-domain method. The plasmonic waveguide was fabricated with the lengths of 2 to $10{\mu}m$ and the widths of 400 to 700 nm, respectively. The plasmonic mode and optical loss were measured. The optimum plasmonic length is $10{\mu}m$ and widths are 600 and 700 nm in the fabricated waveguide. This plasmonic waveguide can be directly integrated with other conventional optical devices and can be essential building blocks of PIC.
플라즈모닉스 현상을 이용한 전반사 기반 다층 유전체 박막 센서의 특성 분석
김홍승,이태경,김두근,정유라,오금윤,이병현,기현철,최영완,Kim, Hong-Seung,Lee, Tae-Kyeong,Kim, Doo-Gun,Jung, You-Ra,Oh, Geum-Yoon,Lee, Byeong-Hyeon,Ki, Hyun-Chul,Choi, Young-Wan 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.7
In this paper, we have theoretically analyzed and designed a dielectric multi-layer sensor with a SPR (surface plasmon resonance) using analytical calculation and FDTD (finite difference time-domain) methods. The proposed structure is composed of periodic layer and thin metal film. It has many advantages. One of that is a high sensitivity of the SPR. Another is a high Q-factor of the characteristics in the PhC (photonic crystals) micro-cavity structure. The incident light has double resonance characteristics, because the filtered light by PhC structure, dielectric multi-layer, is met the thin metal film for SPR effect. We have also observed the change of resonance characteristics according to the variation of effective index on the metal film.
사출성형기의 외부진동과 소음데이터 분석을 통한 생산 오류 예측 연구
양영진(YoungJin Yang),고정범(JeongBeom Ko),오금윤(Geum-Yoon Oh) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.4
This paper proposes preemptive measures for preventing faults and abnormalities in production by analyzing external vibrations, noise, and temperature in injection molding machines within the fundamental manufacturing industry. The study utilizes the Power Spectral Density (PSD) to transform data from the time domain to the frequency domain, enabling the identification of irregular frequency components. By monitoring changes in specific frequency ranges, the stydy aims to detect irregularities indicative of potential faults at an early stage, facilitating predictive maintenance. The methodology involves synchronizing measurement timing with the equipments operational cycle, capturing vibrations, noise, and temperature at regular intervals. Real-time data is then compared with established baseline values to identify deviations. The proposed algorithm highlights the potential for real-time monitoring and preemptive maintenance in injection molding equipment.
광결정 공진기와 링 공진기의 공진특성 결합을 통한 바이오센서 응용
김홍승(Hong-Seung Kim),김두근(Doo-Gun Kim),오금윤(Geum-Yoon Oh),이태경(Tae-Kyeong Lee),최영완(Young-Wan Choi) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
We propose a novel ring structure based on the stadium-shaped ring resonator (SSRR) with dual photonic crystal microcavity (DPCM) for biosensor and analyzed the sensing characteristics. The Q-factor of the photonic crystal microcavity (PCM) can be significantly enhanced when the PCM or DPCM has the same resonance condition as the SSRR. The simulation results show that the Q-factor of the SRR with DPCM was increased by three times in comparison with single PCM structure. We also defined a mutual interference between two PCMs. Assuming a detectable spectral resolution of 10 picometers, a refractive index resolution of 3.03×10-5 can be measured on the SSRR-DPCM.
김두근(Doo Gun Kim),김선훈(Seon-Hoon Kim),기현철(Hyun-Chul Ki),김회종(Hwe-Jong Kim),오금윤(Geum-Yoon Oh),최영완(Young-Wan Choi) 대한전기학회 2010 전기학회논문지 Vol.59 No.5
We have investigated the grating coupled surface plasmon resonance (GC-SPR) sensors using ZnO nano-grating structures to enhance the sensitivity of an SPR sensor. The GC-SPR sensors were analyzed using the finite-difference time-domain method. The optimum resonance angles of 49 degrees are obtained in the 150 ㎚ wide grating structure with a period of 300 ㎚ for the ZnO thickness of 30 ㎚. Then, the ZnO nano-grating patterns were fabricated by using laser interference lithography. The measured resonance angle of nano-grating patterns was around 49 degrees. Here, an enhanced evanescent field is obtained due to the surface plasmon on the edge of the bandgap when the ZnO grating structures are used to excite the surface palsmon.