Polarization-dependent extraordinary optical transmission from upconversion nanoparticles. Issue 43 (21st October 2015)

• Record Type: Journal Article
• Authors: Wang, Peng Hui; Salcedo, Walter J.; Pichaandi, Jothirmayanantham; van Veggel, Frank C. J. M.; Brolo, Alexandre G.
• Is Part Of: Nanoscale. Volume 7:Issue 43(2015)
• Page Start: 18250
• Page End: 18258
• Publication Date: 2015-10-21
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c5nr04608d
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Enhanced upconversion (UC) emission was experimentally demonstrated using gold double antenna nanoparticles coupled to nanoslits in gold films. Abstract : 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.