Polarization-dependent multipolar plasmon resonances in anisotropic multiscale au particles

Eun Ah You; Wei Zhou; Jae Yong Suh; Mark D. Huntington; Teri W. Odom

doi:10.1021/nn204845z

Polarization-dependent multipolar plasmon resonances in anisotropic multiscale au particles

Eun Ah You, Wei Zhou, Jae Yong Suh, Mark D. Huntington, Teri W. Odom

Northwestern University

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

This paper reports the fabrication and characterization of three-dimensional (3D) multiscale Au particles with different aspect ratios. Increasing the length of the particles resulted in excitation of a longitudinal mode and two different transverse modes having different multipolar orders. The multipolar orders increased for both longitudinal and transverse modes as the aspect ratio increased. Finite-difference time-domain calculations revealed that the structural asymmetry of the 3D anisotropic particles were the reason for the two distinct transverse plasmon resonances. When the 3D structural change occurred at the ends of the multiscale particle, however, the optical response showed two resonances in the longitudinal direction and only a single resonance in the transverse direction.

Original language	English
Pages (from-to)	1786-1794
Number of pages	9
Journal	ACS nano
Volume	6
Issue number	2
DOIs	https://doi.org/10.1021/nn204845z
Publication status	Published - Feb 28 2012

Keywords

3D anisotropic nanoparticles
multipolar longitudinal plasmon modes
multipolar transverse plasmon modes
multiscale particles
polarization-dependent scattering

ASJC Scopus subject areas

Materials Science(all)
Engineering(all)
Physics and Astronomy(all)

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abstract = "This paper reports the fabrication and characterization of three-dimensional (3D) multiscale Au particles with different aspect ratios. Increasing the length of the particles resulted in excitation of a longitudinal mode and two different transverse modes having different multipolar orders. The multipolar orders increased for both longitudinal and transverse modes as the aspect ratio increased. Finite-difference time-domain calculations revealed that the structural asymmetry of the 3D anisotropic particles were the reason for the two distinct transverse plasmon resonances. When the 3D structural change occurred at the ends of the multiscale particle, however, the optical response showed two resonances in the longitudinal direction and only a single resonance in the transverse direction.",

keywords = "3D anisotropic nanoparticles, multipolar longitudinal plasmon modes, multipolar transverse plasmon modes, multiscale particles, polarization-dependent scattering",

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AU - You, Eun Ah

AU - Zhou, Wei

AU - Suh, Jae Yong

AU - Huntington, Mark D.

AU - Odom, Teri W.

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