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Polarization-dependent SERS at differently oriented single gold nanorods.

Jiqing Jiao¹, Xiao Wang, Frank Wackenhut

¹Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 15, 72076, Tübingen, Germany.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry

|March 2, 2012

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Gold nanorod orientation impacts surface-enhanced Raman spectroscopy (SERS) of adenine. Azimuthal polarization enhances signals from flat nanorods by exciting plasmon resonance more efficiently.

Area of Science:

Plasmonics
Nanophotonics
Surface-Enhanced Raman Spectroscopy (SERS)

Background:

Surface-enhanced Raman spectroscopy (SERS) offers high sensitivity for molecular detection.
Controlling plasmonic properties of nanostructures is crucial for optimizing SERS.
Understanding nanorod orientation effects is key for advanced SERS applications.

Purpose of the Study:

Investigate how individual gold nanorod orientation affects polarization-dependent SERS.
Explore the use of higher-order laser polarizations for SERS.
Correlate nanorod orientation with enhanced Raman signal intensity.

Main Methods:

Utilized higher-order laser beams (radial and azimuthal polarizations).
Employed a parabolic mirror-assisted confocal optical microscope.

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Analyzed photoluminescence (PL) patterns and simulated electric-field distributions.

Main Results:

Differentiated between isolated nanorods, clusters, and differently oriented single nanorods.
Found azimuthal polarization efficiently excites longitudinal particle plasmon resonance (PPR) for flat nanorods.
Observed stronger enhanced adenine Raman spectra with azimuthal polarization compared to radial.

Conclusions:

Gold nanorod orientation significantly influences SERS signal intensity.
Azimuthal polarization is effective for exciting PPR in flat nanorods, enhancing SERS.
This study provides insights for optimizing SERS measurements using controlled nanorod orientation and polarization.