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NanoMat 2018
Nano Research & Applications
ISSN: 2471-9838
Page 93
April 26-27, 2018
Rome, Italy
17
th
Edition of International Conference on
Emerging Trends in
Materials Science and
Nanotechnology
P
lasmonic metasurfaces are emerging as two-dimensional
metamaterials capable of manipulating the phase, amplitude,
and polarization of light on the nanoscale, which have been
successfully demonstrated as abundant promising applications
in advanced photonic devices. Plasmonic nano-patterned
colloidal metasurfaces enable light manipulation at the
nanoscale. However, a fast and controllable fabrication for such
structures remains a major challenge in nano-optics. Here, we
propose a strategy for rapid optically directed assembly (ODA)
of colloidal metallic metasurfaces with ordered nano-patterns
using orthogonal laser standing evanescent wave (LSEW) fields
within less than 10 minutes. We demonstrate the underlying
cooperative mechanism of optical forces exertions on colloidal
nanoparticles (NPs) in orthogonal LSEW fields with a non-
focused ultralow fluence irradiation of 0.25 Wcm-2, which leads
to the formation of nano-patterned colloidal silver metasurfaces
with a large area of 50 mm2. The demonstration of polarizations
stabilizing during the nano-patterns formation confirmed by a
polarization-dependent surface enhanced Raman spectroscopy
(p-SERS) characterization substantiates further the interpretation
of dynamical driving and binding processes of ODA. This unique
combination of top-down nanostructured optical fields directing
and bottom-up assembly provide an important foundation for
designing and fabricating reconfigurable colloidal nano-patterned
metasurfaces for nanoscale control of optical fields. This study
constitutes the fundamental step for the fabrication of complex
functional nanostructures based on the assembled NPs, which
provides the capabilities and applications of optical trapping in
new and intriguingways and offers the perspectives on the rapidly
emerging areas of nano-photonics and nano-biology.
xphuang@uestc.edu.cnRapid optically directed assembly of nano-patterned
metasurfaces with colloidal nanoparticles
Xiaoping Huang
1, 2
1
University of Electronic Science and Technology of China, China
2
Institute of Ion Beam Physics and Materials Research, Germany
Nano Res Appl, Volume:4
DOI: 10.21767/2471-9838-C1-009