Department of Applied Physics,The Hong Kong Polytechnic University,Hong Kong,China;
Key Laboratory of Optoelectronic Materials Chemistry and Physics,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,Fujian 350002,China;
Central European Institute of Technology,Brno University of Technology,Brno 61669,Czech Republic;
Department of Chemistry,Hong Kong Baptist University,Hong Kong,China;
Förster resonance energy transfer; gold nanorods; lanthanide-doped upconversion nanocrystals; plasmon-enhanced nonlinear fluorescence; polarization modulation;