21 April 2016 Sensing characteristics of plasmonic structure based on transferring process of polystyrene nano-beads
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Abstract
We analyzed and demonstrated the double layered metallic nano-structures using polystyrene lift-off process on the conventional surface plasmon resonance (SPR) sensor to enhance the sensitivity of an SPR surface. The double layered plasmonic structures are optimized using the three-dimensional finite-difference time-domain method for the width, thickness, and period of the polystyrene beads. The thickness of the metal film and the metallic nano-hole is 20 and 20 nm in the 305 nm wide nano-hole size, respectively. The double layered metallic nano-structures are fabricated with monolayer polystyrene beads of chloromethyl latex 4% w/v 0.4 μm. The sensitivities of the conventional SPR sensor and the double layered plasmonic sensor are obtained to 42.2 and 60 degree/RIU, respectively. The SPR devices are also applied to the lead ion sensor. The resonance shifts of SPR sensors with and without a poly(vinyl chloride) membrane are 1328 RU and 788 RU from 10-5 M to 10-2 M concentration, respectively.
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Doo Gun Kim, Jeongwoo Hwang, Seon Hoon Kim, Hyun Chul Ki, Tae Un Kim, Jae Cheol Shin, Dae-Cheol Jeong, Seungwon Jeon, Hong-Seung Kim, Young-Wan Choi, "Sensing characteristics of plasmonic structure based on transferring process of polystyrene nano-beads", Proc. SPIE 9884, Nanophotonics VI, 98842S (21 April 2016); doi: 10.1117/12.2227468; https://doi.org/10.1117/12.2227468
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