Hello.
My name is Viktoriia Babicheva.
I work in the College of Optical Sciences at the University of Arizona.
Today, I want to briefly highlight our paper written with Jerry Moloney and published in
Nanophotonics.
The work reports Lattice effect influence on the electric and magnetic dipole resonance
overlap in a disk array.
High-refractive-index dielectrics, such as silicon, germanium, and III–V compounds,
have been shown to be a promising platform for realizing subwavelength nanoantennas.
One of the advantages of such high-index antennas over conventional plasmonic nanoparticles
is the possibility of exciting both electric and magnetic resonances in nanoparticles of
simple shape, such as spheres or disks.
The interplay of resonances, for instance, their overlap, offers the potential to tune
scattering and engineer more efficient subwavelength antennas.
Designing the shape of silicon nanoparticles has been shown to be an effective approach
to increasing overlap between electric and magnetic dipole resonances thereby achieving
directional scattering and reflection decrease.
Variations of disk diameter and height affect resonances differently and can result in resonance
overlap.
However, it is important to note that in most of the studies, the disks are arranged in
a periodic array where the distance between the disks is varied together with disk diameter.
But the effect of these changes has remained overlooked, and so far, the role of lattice
effect has been neglected.
In the present work, we have studied a periodic array of disks and shown that the contribution
of the lattice effect in shifting resonance positions is comparable
to the effect of the diameter change.
Nanoparticle resonances are strongly affected by their arrangement even in the case of subdiffraction
distances, and this effect can play a crucial role in defining the resonance positions and
their overlap.
We have demonstrated that the lattice effect is important even when the wavelength of diffraction
remains on the blue side from electric and magnetic dipole resonances and no additional
lattice resonances are excited.
We have shown that resonance position can be changed by the period, and electric and
magnetic dipole resonances can be brought into overlap solely by the change of array
period having constant disk diameter.
Thank you very much for watching this video and your time!
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