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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47363

Title: Enhancing angular sensitivity of plasmonic nanostructures using mode transition in hexagonal gold nanohole arrays
Authors: Pei-Kuen Wei
En-Hung Lin
Wan-Shao Tsai
Kuang-Li Lee
Ming-Chang M. Lee
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2017-03
Issue Date: 2018-07-17T01:49:47Z
Publisher: Sensors and Actuators B: Chemical
Abstract: Abstract: We presented a surface plasmon resonance (SPR) sensor with an angular sensitivity up to 440 deg/RIU by using (±1,∓1) mode on a hexagonal gold nanohole array. The large-area gold nanohole arrays were fabricated by thermal-annealing template-stripping method with 180-nm-hole diameter and 600-nm period. A flat dispersion curve deviated from Bragg condition for (±1,∓1) mode occurred when incident angle was larger than 20°. The finite-difference time-domain calculations verified that plasmonic mode changed from surface plasmon mode to cavity mode in nanoholes. Such mode transition resulted in the large change of dispersion curve. The angular sensitivity of the (±1,∓1) mode near the transition band was 6.2 times higher than surface plasmon mode under Bragg condition and 4.5 times higher than prism-based SPR sensors at 850 nm wavelength. Biosensing experiments for antigen-antibody interactions verified the surface binding sensitivity was higher than prism-based SPR machine.
Relation: 241(31) pp.800-805
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/47363
Appears in Collections:[光電科學研究所] 期刊論文

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