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        Inverse DVD-R grating structured SPR sensor platform with high sensitivity and figure of merit

        Baeck B. Choi,Bethy Kim,Jason Bice,Curtis Taylor,Peng Jiang 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.116 No.-

        The figure of merit (FOM, 1/RIU) 112.34 is achieved in the Au-covered epoxy grating (Au/Epoxy) with theinverse structure of the original track pitch DVD-R. The feasible exfoliation of the cured epoxy resin fromthe Au-covered polycarbonate (PC) gratings (Au/PC) of DVD-R grating creates a narrow deep channelstructure. As well as Au/PC, newly created Au/Epoxy gratings glow beautifully with rainbow-coloredstripes on the surface due to the constructive interference of visible light. The SEM and 3D-AFM imagesshow that the surface distortion of the Au/Epoxy grating is 0.58 (negative) and that of the Au/PC gratingis 0.14 (positive). The Au/Epoxy grating exhibits 872.01 nm/RIU with slightly lower sensitivity than theAu/PC grating (887.59 nm/RIU). However, the Au/Epoxy grating shows a total of 7.76 ± 0.53 nm with up tofull width half maximum (FWHM) for the SPR dip during the detection test, so a high FOM of 112.34 canbe achieved. In addition, the FDTD simulation shows the experimental results as well as the relevantresults of the SPR deep wavelength and FWHM. Finally, the Au/Epoxy grating shows a more pronouncedresonance for methanol concentration measurements than the Au/PC grating due to the high FOM andstrong adhesion between the Au layer and the epoxy substrate.

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