Mr. Yuen Yung Hui Profile

Yuen Yung Hui

at Academia Sinica

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Proceedings Article | 25 October 2018 Paper

Light emission from plasmonic nanostructures enhanced with fluorescent nanodiamonds

Jingyi Zhao, Yuqing Cheng, Hongming Shen, Huan-Cheng Chang, Yuen Yung Hui, Te Wen, Qihuang Gong, Guowei Lu

Proceedings Volume 10824, 1082411 (2018) https://doi.org/10.1117/12.2500440

KEYWORDS: Plasmonics, Nanostructures, Nanoparticles, Gold, Luminescence, Atomic force microscopy, Nanolithography, Molecular assembly, In situ metrology, Optical testing

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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.

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