Share Email Print

Proceedings Paper

Dual channel fluorescence engineering on the nano-patterened metamaterial (Conference Presentation)
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Upconversion fluorescence from Lanthanide-doped nanocrystals has attracted widespread interests because of its greatly potential applications in various fields, such as photonic crystal lasers, material science, biological therapy, and so on. However, the relatively low quantum yield (typically < 5%) is the major limitation for upconversion nanocrystals. Meanwhile, in addition to the chemical methods, plasmonic structures have been adopted as another strategy to improve the radiation efficiency and control the relaxation process of the upcovnersion nanocrystals. We designed the anti-symmetric split ring resonators with various periods and the fishnet structures. The surface plasmon resonance peaks of the structure shift as the periods varies. For example, in a multi-layered plamsonic metasurface with the period of 250nm, both the electric and magnetic modes could be generated simultaneously when excited by the incident light with proper polarization. This plasmonic structure provides two different channels for the enhancement of upconversion fluorescence. The resonance peak of 650nm is magnetic resonance mode, while the peak of 980nm is electric resonance mode. The resonance peak of 980nm coincides with the absorption band of the Lanthanide-dopoed nanocrystal, and the peak of 650nm matches with its emission band. We found that the upconversion fluorescence intensity could be enhanced more than 10 times when the electric resonance frequency of the metasurface matches with the absorption band of the upconversion nanocrystals, while the magnetic mode overlaps with its emission band. This is due to the local density of optical states was significantly enhanced by the plasmonic metasurface. The detailed results and mechanism will be discussed.

Paper Details

Date Published: 9 November 2016
PDF: 1 pages
Proc. SPIE 9921, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIV, 99210U (9 November 2016); doi: 10.1117/12.2237218
Show Author Affiliations
Huijun Wu, National Taiwan Univ. (Taiwan)
Ming Lun Tseng, National Taiwan Univ. (Taiwan)
Wei Yi Tsai, National Taiwan Univ. (Taiwan)
Ting-Yu Chen, National Taiwan Univ. (Taiwan)
Yihsin Chien, Research Ctr. for Applied Sciences - Academia Sinica (Taiwan)
Yun-Chorng Chang, Research Ctr. for Applied Sciences - Academia Sinica (Taiwan)
Din Ping Tsai, Research Ctr. for Applied Sciences - Academia Sinica (Taiwan)
National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 9921:
Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIV
Satoshi Kawata; Din Ping Tsai, Editor(s)

© SPIE. Terms of Use
Back to Top