Date:

2025-04-30

Title of Paper:

Distance-Dependent Fluorescence Quenching Efficiency of Gold Nanodisk: Effect of Aspect Ratio-Dependent Plasmonic Absorption

Journal:

Plasmonics

Summary:

The fluorescence quenching efficiency of an
emitter close to a gold nanodisk is investigated by
theoretical calculation based on the modified quasi-static
approximation and fluorescence energy transfer under
dipole–dipole coupling. The calculation results show that
the surface plasmon resonance (SPR) absorption is the key
factor to affect the quenching efficiency. Because of the
asymmetric shape of the gold disk, the light absorption
depends on both particle volume and aspect ratio (AR).
Thus, the AR cannot control the quenching efficiency of
gold nanodisk alone. Whether the disk volume is fixed or
not may bring different changing way of AR-controlled
quenching efficiency. Increasing the AR leads to the
quenching efficiency of perpendicular mode start to
decrease at a farther distance when the disk volume is
changed, but start to decrease at a nearer distance when the
volume is fixed. At a given wavelength, one can find a
distinct peak in the AR-dependent quenching efficiency
curve of parallel mode when the volume is fixed, which is
absent from the quenching efficiency curve when the
volume is changed. All these tunable quenching efficiency
characteristics have been explained by the changing of
intensity, shift, and bandwidth of SPR absorption.

Co-author:

Jian Zhu, Jian-Jun Li, Jun-Wu Zhao

Translation or Not:

No

Date of Publication:

2012-06-01