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8 February 2015 Plasmonic characteristics of metallic nano-ring structures
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We proposed and demonstrated the metallic nano-ring structure using polystyrene lift-off process to enhance the sensitivity of an SPR surface. The double layered SPR structures are optimized using the finite-difference time-domain method for the width, thickness, and period of the polystyrene beads. The optimum thickness of the metal film and the metallic nano-ring is 30 and 20 nm in the 214 nm wide nano-hole size, respectively. The metallic nano-ring structures are fabricated with monolayer polystyrene beads of 400 nm wide. The various metallic nano-ring structures have been obtained by transferring method. The sensitivities of the conventional SPR sensor and the metallic nano-ring structures are obtained to 42.2 and 52.1 degree/RIU, respectively.
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Doo Gun Kim, Byung Gue Jung, Seon Hoon Kim, Hyun Chul Ki, Tae Un Kim, Hwe Jong Kim, Hong-Seung Kim, and Young Wan Choi "Plasmonic characteristics of metallic nano-ring structures", Proc. SPIE 9370, Quantum Sensing and Nanophotonic Devices XII, 93701B (8 February 2015);

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