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Updated: Jan 30, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
Upconversion enhancement by a dual-resonance all-dielectric metasurface
Chensheng Gong1, Wen Liu, Nan He
1State Key Laboratory for Modern Optical Instrumentation, Centre for Optical and Electromagnetic Research, East Building No. 5, Zijingang Campus. and Zhejiang University, Hangzhou 310058, China. sailing@kth.se.
Abstract:
Upconversion nanoparticles (UCNPs) have drawn much attention in the past decade due to their superior physicochemical features and great potential in biomedical and biophotonic studies. However, their low luminescence efficiency often limits their applications. Here, we demonstrated a dual-resonance all-dielectric metasurface to enhance the signals emitted by upconversion nanoparticles (NaYF4:Yb/Tm). An averaged upconversion signal enhancement of around 400 times is detected experimentally. The electric and magnetic dipole resonances of the metasurface are designed to enhance the local excitation field and the quantum efficiency of the upconversion nanoparticles, respectively. Furthermore, the collection efficiency is enhanced due to the directional emission of the UCNPs on the metasurface. Our approach provides a powerful tool to extend the sensing application potential of upconversion nanoparticles.
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