1. Enhanced UV upconversion emission using plasmonic nanocavities.
- Author
-
El Halawany A, He S, Hodaei H, Bakry A, Razvi MA, Alshahrie A, Johnson NJ, Christodoulides DN, Almutairi A, and Khajavikhan M
- Abstract
Upconversion of near infrared (NIR) into ultraviolet (UV) radiation could lead to a number of applications in bio-imaging, diagnostics and drug delivery. However, for bare nanoparticles, the conversion efficiency is extremely low. In this work, we experimentally demonstrate strongly enhanced upconversion emission from an ensemble of β-NaYF
4 :Gd3+ /Yb3+ /Tm3+ @NaLuF4 core-shell nanoparticles trapped in judiciously designed plasmonic nanocavities. In doing so, different metal platforms and nanostructures are systematically investigated. Our results indicate that using a cross-shape silver nanocavity, a record high enhancement of 170-fold can be obtained in the UV band centered at a wavelength of 345 nm. The observed upconversion efficiency improvement may be attributed to the increased absorption at NIR, the tailored photonic local density of states, and the light out-coupling characteristics of the cavity.- Published
- 2016
- Full Text
- View/download PDF