Giant Enhancement of Upconversion Fluorescence of NaYF4:Yb3+,Tm3+ Nanocrystals with Resonant Waveguide Grating Substrate
| Autor: | Chu Chi Ting, Jian Hung Lin, Hao Yu Liou, Hung-Chih Kan, Chen Dao Wang, Chia Chen Hsu, Ching-Ting Lee, Chun Yen Tseng |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Guided-mode resonance business.industry Doping Cladding (fiber optics) Fluorescence Ray Atomic and Molecular Physics and Optics Photon upconversion Electronic Optical and Magnetic Materials Optics Electric field Optoelectronics Electrical and Electronic Engineering business Excitation Biotechnology |
| Zdroj: | ACS Photonics. 2:530-536 |
| ISSN: | 2330-4022 |
| DOI: | 10.1021/ph500427k |
| Popis: | By embedding NaYF4:Yb3+,Tm3+ nanocrystals into the top cladding layer of a resonant waveguide grating structure, we demonstrate that the upconversion fluorescence of Tm3+ ions can be greatly enhanced, by a factor of up to 104. The resonant waveguide grating structure consists of an SU8 bottom layer with sinusoidal grating morphology coated with a thin TiO2 waveguide layer and then covered with a poly(methyl methacrylate) cladding layer doped with NaYF4:Yb3+,Tm3+ nanocrystals. The giant enhancement of the upconversion fluorescence is achieved first by coupling the excitation light with a guided mode of the resonant waveguide grating structure and then the fluorescent light with a second guided mode. Our numerical simulation results obtained by rigorous coupled-wave analysis indicate that the electric field of the incident light is strongly enhanced near the interface of the TiO2 layer and the poly(methyl methacrylate) layer at guided mode resonance, and this is the major effect of the observed enhancement ... |
| Databáze: | OpenAIRE |
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