Subnanomolar fluorescent-molecule sensing by guided resonances on nanoimprinted silicon-on-insulator substrates

We have produced nanoimprinted silicon-on-insulator (SOI) substrates with high precision and applied them for fluorescence (FL) enhancement of typical dye molecules of Rhodamine series. We experimentally found that the FL signals on the nanoimprinted SOI substrates are enhanced by more than 200 fold...

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Bibliographic Details
Published in:Applied physics letters 2014-11, Vol.105 (20)
Main Authors: Choi, Bongseok, Iwanaga, Masanobu, Ochiai, Tetsuyuki, Miyazaki, Hideki T., Sugimoto, Yoshimasa, Sakoda, Kazuaki
Format: Article
Language:English
Subjects:
Applied physics
Fluorescence
Rhodamine
Silicon substrates
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Summary:We have produced nanoimprinted silicon-on-insulator (SOI) substrates with high precision and applied them for fluorescence (FL) enhancement of typical dye molecules of Rhodamine series. We experimentally found that the FL signals on the nanoimprinted SOI substrates are enhanced by more than 200 fold as compared with the signals on Si wafers. The FL enhancement mechanism was investigated using spectroscopic and theoretical approaches. The results indicated that guided resonances with large density of states significantly contribute to the FL enhancement. We also substantiated that the FL-enhancing substrates well serve as rapid-sensing platforms for a very dilute FL-molecule solution with subnanomolar concentration. The nanoimprinted SOI substrates were repeatedly reused without degradation.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4902424