Characteristics of light emission from surface plasmons based on rectangular silver gratings |
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Authors: | Seung Ho Choi Kyung Min Byun |
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Institution: | a Interdisciplinary Program of Bioengineering, Seoul National University, Seoul, 152-742, Republic of Korea b School of Electrical Engineering and Computer Science, Seoul National University, Seoul, 151-742, Republic of Korea c Department of Biomedical Engineering, Kyung Hee University, Yongin, 446-701, Republic of Korea |
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Abstract: | We investigated the characteristics of transmitted light from propagating surface plasmons based on rectangular silver gratings. The results calculated by rigorous coupled-wave analysis presented that silver diffraction gratings can produce significant transmittance and conversion efficiency, comparable to the case of dielectric gratings. Especially, silver gratings optimized at a wide range of grating thickness and period may lead to an improved diffraction efficiency larger than 64%. Moreover, the effect of silver oxide layer on the transmittance was examined and a bimetallic structure with a thin gold coating was introduced to prevent an oxidation of silver substrates. As a practical sensor application, silver grating-based surface plasmon resonance (SPR) configuration showed an enhanced sensitivity associated with an increase of surface reaction area and strong excitations of local plasmon fields, outperforming a conventional thin-film-based SPR structure. |
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Keywords: | Surface plasmons Silver gratings Transmission Silver oxidation Biosensor |
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