Abstract
We report on the interest of spontaneous emission control with planar dielectric multi-layer structures to increase the fluorescence collection efficiency in single-molecule detection experiments and ultrasensitive analysis. The effect of a very simple Fabry Perot microcavity on the radiation pattern of Eu3+ chelate molecules is introduced and discussed. Then the fluorescence correlation spectroscopy (FCS) technique is used to detect Cyanine 5 molecules on a simple mirror and Rhodamine 6G (R6G) molecules in a microcavity, both in liquid solutions. The respective advantages of those dielectric structures for increasing the count rate per molecule are described. The detection enhancement is used to demonstrate photon antibunching on the nanosecond time scale with a dilute solution of R6G molecules (10-9 M) in the microcavity.
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