Light emission from plasmonic nanostructures enhanced with fluorescent nanodiamonds

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

doi:10.1117/12.2500440

25 October 2018 Light emission from plasmonic nanostructures enhanced with fluorescent nanodiamonds

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

Proceedings Volume 10824, Plasmonics III; 1082411 (2018) https://doi.org/10.1117/12.2500440
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

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.

Citation Download Citation

Jingyi Zhao, Yuqing Cheng, Hongming Shen, Yuen Yung Hui, Te Wen, Huan-Cheng Chang, Qihuang Gong, and Guowei Lu "Light emission from plasmonic nanostructures enhanced with fluorescent nanodiamonds", Proc. SPIE 10824, Plasmonics III, 1082411 (25 October 2018); https://doi.org/10.1117/12.2500440

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KEYWORDS

Nanoparticles

Nanostructures

Plasmonics

Gold

Atomic force microscopy

In situ metrology

Luminescence

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