Abstract

We demonstrate a scheme to characterize the localized surface plasmon resonances (LSPRs) of an individual metallic nanorod by employing a focused radially polarized beam (RPB) illumination under normal incidence. The focused RPB has a unique three-dimensional electric field polarization distribution in the focal plane, which can effectively and selectively excite the dipole and multipole plasmon resonances in a metallic nanorod by just moving the nanorod within the focal plane. This performance can be attributed to the mode matching between the excitation electric field of the incident RPB and the LSPRs in a metallic nanorod. Emphatically, in contrast to the commonly used oblique incidence illumination with the linearly polarized light, our proposed scheme is based on the normally incident light illumination and compatible with conventional optical microscopy, which is more scalable for spectroscopic characterization of individual nanostructures.

© 2019 Optical Society of America

Tailoring the excitation of localized surface plasmon-polariton resonances by focusing radially-polarized beams

Nassiredin M. Mojarad and Mario Agio
Opt. Express 17(1) 117-122 (2009)

Nanostructures for surface plasmons

Junxi Zhang and Lide Zhang
Adv. Opt. Photon. 4(2) 157-321 (2012)

Unidirectional scattering exploited transverse displacement sensor with tunable measuring range

Wuyun Shang, Fajun Xiao, Weiren Zhu, Lei Han, Malin Premaratne, Ting Mei, and Jianlin Zhao
Opt. Express 27(4) 4944-4955 (2019)

Selective excitation of a three-dimensionally oriented single plasmonic dipole

Fajun Xiao, Guanglin Wang, Xuetao Gan, Wuyun Shang, Shiyin Cao, Weiren Zhu, Ting Mei, Malin Premaratne, and Jianlin Zhao
Photon. Res. 7(6) 693-698 (2019)

Dark and bright localized surface plasmons in nanocrosses

Niels Verellen, Pol Van Dorpe, Dries Vercruysse, Guy A. E. Vandenbosch, and Victor V. Moshchalkov
Opt. Express 19(12) 11034-11051 (2011)