Asymmetrically Curved Hyperbolic Metamaterial Structure with Gradient Thicknesses for Enhanced Directional Spontaneous Emission

We demonstrate hyperbolic metamaterials (HMMs) on a curved surface for an efficient outcoupling of nonradiative modes, which lead to an enhanced spontaneous emission. Those high-wavevector plasmonic modes can propagate along the curved structure and emit into the far field, realizing a directional l...

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Published inACS applied materials & interfaces Vol. 10; no. 9; pp. 7704 - 7708
Main Authors Wang, Lu, Li, Shilong, Zhang, Biran, Qin, Yuzhou, Tian, Ziao, Fang, Yangfu, Li, Yonglei, Liu, Zhaowei, Mei, Yongfeng
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 07.03.2018
Subjects
Purcell factor
spontaneous emission
directionality
outcoupling
hyperbolic metamaterial
fluorescent intensity
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Summary:We demonstrate hyperbolic metamaterials (HMMs) on a curved surface for an efficient outcoupling of nonradiative modes, which lead to an enhanced spontaneous emission. Those high-wavevector plasmonic modes can propagate along the curved structure and emit into the far field, realizing a directional light emission with maximal fluorescent intensity. Detailed simulations disclose a high Purcell factor and a spatial power distribution in the curved HMM, which agrees with the experimental result. Our work presents remarkable enhancing capability in both the Purcell factor and emission intensity, which could suggest a unique structure design in metamaterials for potential application in, e.g., high-speed optical sensing and communications.
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ISSN:1944-8244
1944-8252
DOI:10.1021/acsami.7b19721