| 초록 |
Surface plasmon resonance (SPR) is a resonantly coupled electromagnetic field between the incident light and electrons of metal, propagating at dielectric/metal interface, which is subceptible to the change in dielectric environment, allowing for label-free detection. To increase the sensitivity, utilization of gold nanoparticles (AuNPs) is one of promising strategies for that purpose. Here, we demonstrate unique strategies for enhancing the sensitivity of SPR sensor by exploiting the coupling between propagating SPR of Au-film and localized SPR of AuNP array fabricated by block-copolymer template. AuNP array was integrated onto Au-film via PS-b-P2VP template. By varying the loading protocol of AuNPs, we could control the order of regularity of AuNP array. Angular sensitivity was compared with control experiment (without AuNP array). LSPR of AuNPs was effectively coupled with SPs of Au-film, and Au nanocluster array showed 8.92 times higher sensitivity compared with a control sample. |
