Cuprous Oxide Cubic Particles with Strong and TunableMie Resonances for Use as Nanoantennas
2020
The
ability of plasmonic metal nanostructures (PMNs), such as silver
and gold nanoparticles, to manipulate and concentrate electromagnetic
fields at the nanoscale is the foundation for wide range of applications,
including nanoscale optics, solar energy harvesting, and photocatalysis.
However, there are inherent problems associated with plasmonic metals,
such as high Ohmic losses and poorer compatibility with the conventional
complementary metal–oxide–semiconductor (CMOS) microfabrication
processes. These limitations inhibit the broader use of PMNs in practical
applications. Herein, we report submicrometer cuprous oxide (Cu2O) cubic particles can exhibit strong electric and magnetic
Mie resonances with extinction/scattering cross sections comparable
to or slightly exceeding those of Ag particles. Using size- and shape-controlling
particle synthesis techniques, optical spectroscopy, and finite-difference
time-domain simulations, we show that the Mie resonance wavelengths
are size- and shape-dependent and tunable in the visible to near-infrared
regions. Therefore, submicrometer Cu2O cubic particles
may potentially emerge as high-performance alternatives to PMNs. The
strong electric and magnetic Mie-resonance-mediated nanoantenna attribute
of the Cu2O cubic particles can be potentially used in
a wide range of applications, including nanoscale optics, surface-enhanced
Raman spectroscopy, surface-enhanced infrared absorption spectroscopy,
photocatalysis, and photovoltaics.
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