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Study on grating-coupled Surface Plasmon Resonance in the mid-infrared region 원문보기

  • 저자

    Yong Gun Kwon

  • 학위수여기관

    고려대학교 대학원

  • 학위구분

    국내석사

  • 학과

    신소재공학과

  • 지도교수

    성태연

  • 발행년도

    2014

  • 총페이지

    46p

  • 키워드

    SPR sensor mid ir grating-coupling;

  • 언어

    eng

  • 원문 URL

    http://www.riss.kr/link?id=T13541916&outLink=K  

  • 초록

    In this article, the surface enhanced infrared absorption, which the molecular vibration absorption energy of the marked substance is increased, was studied by materializing the SPR diffraction grating environment and bio-sensor in the mid infrared domain based on the surface plasmon resonance (SPR) researched and used recently in diverse areas such as environment, bio-sensor, solar cell, LED, etc. and by detecting the marked substance . The surface plasmon referred here means the collective behavior of the free electrons existing on the metal surface and represents in the form that the optical absorption or light scattering is increased if the resonance condition of the dipole induced by the incident light injected from the exterior is satisfied. This study obtained the basis through the actual theoretical interpretation and the computer simulation of the rigorous coupled-wave analysis (RCWA) using the diffraction grating structure based on that and performed the experiment. This article consists of two major parts. First, the design of diffraction grating was determined using the optical information in the infrared domain of the Poly-methylmethacrylate (PMMA), the marked substance to detect and the diffraction grating coupling theory, which has been researched a lot so far, and the characteristics of SPR was examined. Based on them, to detect the 5.78um, the C, O double bond (C=O) molecular vibration absorption energy wavelength of the PMMA, the marked substance, the gratings with height of 200 and 450nm, the period of 5 and 6 um were designed and produced by the photolithography method. In addition, since the coupling method using diffraction grating has been researched a lot, the signal changes by the height and period of the diffraction grating and the incident lights angle were observed in the experiment and compared and analyzed with the theoretical computer simulation of RCWA. According to the results, since the strength of the SPR signal is changed by the height of the diffraction grating and the resonance occurs by the - 5 - diffracted lights, the resonance wavelength is determined according to the period and angle of incident lights. Second of a part to detect C=O molecular bond of PMMA. Two methods to be able to detect the substance having small molecular vibration absorption energy, and first, that the reflectance is changed greatly in the molecular vibration absorption wavelength was used. As mentioned previously, if in the air that the reflectance is constant, the incident light angle is changed, the SPR resonance wavelength is shifted constantly and if the PMMA is coated, the reflectance is affected as it penetrates into PMMA, for which the reflectance is changed greatly in the absorption wavelength domain and the expected changes in the SPR wavelength shift length were verified in the experiment and compared with the computer simulation of RCWA theory. Second method is to use the surface enhanced absorption by SPR and localized surface plasmon (LSPR) method using nano structures such as disk, rod, etc in the mid-infrared domain has been studied so far. It was reported that the molecular vibration absorption energy of the substance is amplified up to 103~104 . However, it can be materialized in the SPR method that has advantages of being able to materialize with relatively simple structure and reduce the processes but the researches for that have not been made enough. Therefore, this study will be performed using SPR diffraction grating. Specifically, the coefficient of the enhanced molecular vibration was defined, the trend of the surface enhanced infrared absorption (SEIRA) by the position of the SPR wavelength, which is determined by the period of the diffraction grating and the angle of incident lights based on the computer simulation of theoretical RCWA was examined, and the optimum condition was suggested.


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