Photoluminescence quantum yield from gold nanorods dependence of excitation polarization

Weidong Zhang; Yuqing Cheng; Jingyi Zhao; Te Wen; Aiqin Hu; Qihuang Gong; Guowei Lu

doi:10.1117/12.2573634

2 November 2020 Photoluminescence quantum yield from gold nanorods dependence of excitation polarization

Weidong Zhang, Yuqing Cheng, Jingyi Zhao, Te Wen, Aiqin Hu, Qihuang Gong, Guowei Lu

Proceedings Volume 11556, Nanophotonics and Micro/Nano Optics VI; 115560R (2020) https://doi.org/10.1117/12.2573634
Event: SPIE/COS Photonics Asia, 2020, Online Only

Conference Poster

Abstract

In experiments, we demonstrated that luminescence quantum yield of single gold nanorods illuminated by continuous wave laser at wavelength of 532 nm depends on the excitation polarization, while that excited by 633 nm laser does not. The electrons in sp-band dominates the luminescence process when the 633 nm laser is applied, resulting in a constant quantum yield under different excitation polarizations. When the 532 nm laser is applied, both the electrons in d-band (interband transition) and sp-band (surface plasmon) involve in the luminescence process. The variation of quantum yield by the 532 nm laser is resulted from different efficiency of d-band interband transition and sp-band plasmon conversion into luminescence. Furthermore, we found that plasmon modes coupling effect can modulate strongly the plasmon emission efficiency by comparing the luminescence of two sets of the nanorods with different size. And smaller size GNRs often results in higher quantum yield of interband transition. These findings make a step to understand the luminescence process of plasmonic nanostructures and point out a rule to control it through plasmon mode coupling effect.

Citation Download Citation

Weidong Zhang, Yuqing Cheng, Jingyi Zhao, Te Wen, Aiqin Hu, Qihuang Gong, and Guowei Lu "Photoluminescence quantum yield from gold nanorods dependence of excitation polarization", Proc. SPIE 11556, Nanophotonics and Micro/Nano Optics VI, 115560R (2 November 2020); https://doi.org/10.1117/12.2573634

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