Fluorescence enhancement by dark plasmon modes
Manuel Peter, Julia F. M. Werra, Cody Friesen, Doreen Achnitz, Kurt, Busch, Stefan Linden
TL;DR
This study demonstrates how gold rod nanoantennas can enhance quantum dot fluorescence by coupling to bright and dark plasmon modes, with potential applications in nanophotonics.
Contribution
It introduces a fabrication method for attaching quantum dots to nanoantennas and shows how tuning nanoantenna length influences fluorescence enhancement via different plasmon modes.
Findings
Fluorescence enhancement varies with nanoantenna length.
Coupling to bright and dark plasmon modes causes different enhancement effects.
Nanoantenna tuning aligns plasmon modes with quantum dot emission.
Abstract
We investigate the fluorescence properties of colloidal quantum dots attached to gold rod nanoantennas. These structures are fabricated by a two step electron beam lithography process in combination with a chemical linking method. By varying the nanoantenna length, the plasmon modes of the nanoantennas are successively tuned through the emission band of the quantum dots. We observe a pronounced fluorescence enhancement both for short and long nanoantennas. These findings can be attributed to the coupling of the quantum dots to bright and dark plasmon modes, respectively.
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