Gold coated Cicada wings: Anti-reflective micro-environment for plasmonic enhancement of fluorescence from upconversion nanoparticles

Akash Gupta, Hao Yu Cheng, Kung Hsuan Lin, Chien Ting Wu, Pradip Kumar Roy, Sandip Ghosh, Surojit Chattopadhyay*

*此作品的通信作者

研究成果: Article同行評審

11 引文 斯高帕斯(Scopus)

摘要

We demonstrate that the upconversion nanoparticles (UCNPs) fluoresce 50 times more on a gold (Au) coated Cicada wing. UCNPs are attractive bioimaging, and therapeutic materials as it is excited in the infrared, limited only by the low fluorescence quantum yield. Here, a plasmonic effect, coupled with an anti-reflecting (AR) Cicada wing substrate coated with Au is demonstrated to enhance the fluorescence of the UCNPs. Silica (SiO2) coated Erbium doped green emitting core-shell UCNPs (NaYF4: Yb3+, Er3+@SiO2) show conventional metal enhanced fluorescence. The AR property of the Cicada wing (R ~0.2% @ 1000 nm) contributes >6-fold enhancement as compared to flat (silicon, and quartz) substrates (R~10–30% @ 1000 nm). Upon plasmon coupling, with an optimally sputtered Au coating, an unprecedented enhancement of >50-fold for the 520, and 655 nm emission was obtained on the Au coated Cicada wings, vis-à-vis planar uncoated (silicon, and quartz) substrates. The enhancement was also confirmed by direct fluorescence imaging of the photonic substrates used. The fluorescence lifetime of the core, and the core-shell UCNPs (~300 μs) decreased by ~30–40%, and 10–30%, respectively, when placed on Au coated substrates.

原文English
頁(從 - 到)569-577
頁數9
期刊Materials Science and Engineering C
102
DOIs
出版狀態Published - 9月 2019

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