Metallic nanostructures including single and double nanodisks are successfully used to enhance the localized electric field in vicinity of microcavity in whispering gallery mode (WGM) sensor. We demonstrate numerical calculations of plasmonic coupling of WGMs to single and double nanodisk arrays on a planar substrate. We then experimentally confirmed that the resonance wavelength of WGM sensor was dramatically shifted by adoption of single and double nanodisks on the surface of microcavity in the WGM sensor. Thus, our approach provides the tunable sensitivity of WGM sensor, and has a great potential to be used in numerous areas where the single biomolecule, protein-protein folding and biomolecular interactions are involved.
Bibliographical noteFunding Information:
T.Y.K. and W.L. equally contributed to this work. This work was supported by Korea Institute for Advancement of Technology (KIAT) (N0002310, Construction Project of Supporting Center for Commercializing Customized Nano-mold-based Technologies) and the National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MSIP) (No. 2017R1A4A1015627). This research was also supported by Korea Institute of Planning and Evaluation for Technology in Food, Agriculture, Forestry and Fisheries (IPET) through Advanced Production Technology Development Program, funded by Ministry of Agriculture, Food, and Rural Affairs (MAFRA) (314033-02).
© 2017 The Author(s).
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