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Grating-coupled transmission-type surface plasmon resonance sensors based on dielectric and metallic gratings
Kyung Min Byun1, Sung June Kim, Donghyun Kim
1School of Electrical Engineering and Computer Science, Seoul National University, South Korea.
Abstract:
We investigated grating-coupled transmission-type surface plasmon resonance (SPR) for sensing applications. In the transmission-type SPR structure, propagating surface plasmons are outcoupled to radiation modes by dielectric and metallic gratings on a metal film. The results calculated in air and water suggest that the proposed structures present extremely linear sensing characteristics. In terms of a figure of merit, a metallic grating-based structure performs 5.4 and 3.7 times better than that of a dielectric grating in air and water, respectively.
