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High Sensitivity Transmission-Type SPR Sensor by Using Metallic-Dielectric Mixed Gratings 被引量:1

High Sensitivity Transmission-Type SPR Sensor by Using Metallic-Dielectric Mixed Gratings
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摘要 We theoretically investigate transmission-type SPR sensors with novel metallic-dielectric mixed gratings by rig- orous coupled-wave analysis (RCWA), compared to the conventional dielectric gratings based structure. It is found that the transmittance efficiency and the full width at half-maximum (FWHM) of the transmission curve can be modulated by increasing or decreasing the metallic part. Therefore, appropriate proportion of metal part will induce enhancement factor of sensor merit. Furthermore, this novel structure will also bring enhancement of resonant angle shift, which can be explained by plasmonie interpretation based on a surface limited increase of interaction area and excitation of localized surface plasmons (LSPs). The proposed configuration has a wide range of potential applications not only as sensor but also other optical devices. We theoretically investigate transmission-type SPR sensors with novel metallic-dielectric mixed gratings by rig- orous coupled-wave analysis (RCWA), compared to the conventional dielectric gratings based structure. It is found that the transmittance efficiency and the full width at half-maximum (FWHM) of the transmission curve can be modulated by increasing or decreasing the metallic part. Therefore, appropriate proportion of metal part will induce enhancement factor of sensor merit. Furthermore, this novel structure will also bring enhancement of resonant angle shift, which can be explained by plasmonie interpretation based on a surface limited increase of interaction area and excitation of localized surface plasmons (LSPs). The proposed configuration has a wide range of potential applications not only as sensor but also other optical devices.
作者 吴斌 王庆康
出处 《Chinese Physics Letters》 SCIE CAS CSCD 2008年第5期1668-1671,共4页 中国物理快报(英文版)
关键词 SURFACE-PLASMON RESONANCE COUPLED-WAVE ANALYSIS RADIATION MODES BIOSENSORS SILVER SURFACE-PLASMON RESONANCE COUPLED-WAVE ANALYSIS RADIATION MODES BIOSENSORS SILVER
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