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Proceedings Paper

Light emission from plasmonic nanostructures enhanced with fluorescent nanodiamonds
Author(s): Jingyi Zhao; Yuqing Cheng; Hongming Shen; Yuen Yung Hui; Te Wen; Huan-Cheng Chang; Qihuang Gong; Guowei Lu
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Paper Abstract

In the surface-enhanced fluorescence (SEF) process, it is well known that the plasmonic nanostructure can enhance the light emission of fluorescent emitters. With the help of atomic force microscopy, a hybrid system consisting of a fluorescent nanodiamond and a gold nanoparticle was assembled step-by-step for in situ optical measurements. We demonstrate that fluorescent emitters can also enhance the light emission from gold nanoparticles which is judged through the intrinsic anti-Stokes emission owing to the nanostructures. The light emission intensity, spectral shape, and lifetime of the hybrid system were dependent on the coupling configuration. The interaction between gold nanoparticles and fluorescent emitter was modelled based on the concept of a quantised optical cavity by considering the nanodiamond and the nanoparticle as a two-level energy system and a nanoresonator, respectively. The theoretical calculations reveal that the dielectric antenna effect can enhance the local field felt by the nanoparticle, which contributes more to the light emission enhancement of the nanoparticles rather than the plasmonic coupling effect. The findings reveal that the SEF is a mutually enhancing process. This suggests the hybrid system should be considered as an entity to analyse and optimise surface-enhanced spectroscopy.

Paper Details

Date Published: 25 October 2018
PDF: 10 pages
Proc. SPIE 10824, Plasmonics III, 1082411 (25 October 2018); doi: 10.1117/12.2500440
Show Author Affiliations
Jingyi Zhao, Peking Univ. (China)
Yuqing Cheng, Peking Univ. (China)
Hongming Shen, Peking Univ. (China)
Yuen Yung Hui, Academia Sinica (China)
Te Wen, Peking Univ. (China)
Huan-Cheng Chang, Academia Sinica (China)
Qihuang Gong, Peking Univ. (China)
Guowei Lu, Peking Univ. (China)

Published in SPIE Proceedings Vol. 10824:
Plasmonics III
Hongxing Xu; Satoshi Kawata; David J. Bergman, Editor(s)

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