Polarization-dependent extraordinary optical transmission from upconversion nanoparticles.
Enhanced upconversion (UC) emission was experimentally demonstrated using gold double antenna nanoparticles coupled to nanoslits in gold films. The transmitted red emission from UC ytterbium and erbium co-doped sodium yttrium fluoride (NaYF4:Yb(3+)/Er(3+)) nanoparticles (UC NPs) at ∼665 nm (excited with a 980 nm diode laser) was enhanced relative to the green emission at ∼550 nm. The relatively enhanced UC NP emission could be tuned by the different polarization-dependent extraordinary optical transmission modes coupled to the gold nanostructures. Finite-difference time-domain calculations suggest that the preferential enhanced UC emission is related to a combination of different surface plasmon mode excitation coupling to cavity Fabry-Perot interactions. A maximum UC enhancement of 6-fold was measured for nanoslit arrays in the absence of the double antennas. In the presence of the double nanoantennas inside the nanoslits, the UC enhancement was between 2- and 4-fold, depending on the experimental conditions.
University of Victoria, Department of Chemistry P.O. Box 3065, Stn CSC, Victoria, BC V8W 3V6, Canada. agbrolo@uvic.ca.
Peng Hui
PH
Wang
Laboratório de Microeletrônica, Departamento de Engenharia Elétrica, Escola Politécnica, Universidade de São Paulo, Av. Professor Luciano Gualberto, 158 trav.3, no. 158, São Paulo 05508-900, SP, Brazil.
Walter J
WJ
Salcedo
University of Victoria, Department of Chemistry P.O. Box 3065, Stn CSC, Victoria, BC V8W 3V6, Canada. agbrolo@uvic.ca.
Jothirmayanantham
J
Pichaandi
University of Victoria, Department of Chemistry P.O. Box 3065, Stn CSC, Victoria, BC V8W 3V6, Canada. agbrolo@uvic.ca.
Frank C J M
FC
van Veggel
University of Victoria, Department of Chemistry P.O. Box 3065, Stn CSC, Victoria, BC V8W 3V6, Canada. agbrolo@uvic.ca.
Alexandre G
AG
Brolo