jp7b01934_si_001.pdf (2.05 MB)
Magnesium as a Novel UV Plasmonic Material for Fluorescence Decay Rate Engineering in Free Solution
journal contribution
posted on 2017-05-04, 00:00 authored by Yunshan Wang, Eric M. Peterson, Joel M. Harris, Kanagasundar Appusamy, Sivaraman Guruswamy, Steve BlairWe
report modification of the ultraviolet (UV) fluorescence decay
rate of p-terphenyl dye molecules by magnesium (Mg)
nanoapertures in free solution, in comparison with aluminum (Al).
Mg nanoapertures exhibit a lifetime reduction of up to ∼7.2×,
which to our knowledge is the largest lifetime reduction of a UV fluorescence
dye reported so far in the literature. In comparison, Al nanoapertures
exhibit a lifetime reduction of ∼5.3×, exceeding the previously
reported value ∼3.5× due to smaller aperture size employed
here. Simulation results reveal large plasmon resonance frequency
shifts between Mg and Al nanoapertures, contributing to different
lifetime reductions, where average lifetime reductions of Mg nanoapertures
are greater than those of Al nanoapertures with diameters smaller
than 40 nm. The dependence of count rate per molecule (CRM) on aperture
size and aperture undercut is also reported, revealing that CRM increases
with increasing undercut.