Gyroid is a type of three-dimensional chiral structures, which have attracted much research attention recently. A
dielectric single gyroid (SG) can be a candidate for providing new means of guiding light because it has been shown to
exhibit complete photonic band gaps. Owing to the chiral nature, the SG metamaterials may exhibit circular polarization-dependent
properties, leading to new types of polarization-sensitive devices. In this work, we present studies based on
finite-difference time-domain (FDTD) method for analyzing the polarization-dependent characteristics of dielectric SG.
We show that the operation frequency of SG metamaterials can be advanced from microwave to visible region by
varying its material, lattice constant and volume fraction. The corresponding band structures, transmission spectra for
right circularly polarized (RCP) light and left circularly polarized (LCP) light, and circular dichroism (CD) indices are
examined. According to our analysis, a circular polarization gap is found in the visible region. In particular, the
correlation between the volume fraction of dielectric SG and the frequency range of circular polarization band gaps is
also investigated. These results are crucial for the design of functional polarization-sensitive devices at the visible
wavelength based on dielectric single gyroid metamaterials.
Metallic nanorod array metamaterials, consisting of nanowires arranged in a two-dimensional array, have exhibited many
unique features and attracted much attention recently. Owing to the sensitive nature of the plasmon resonances to
changes in geometrical parameters of nanorod arrays, significant shift in resonance wavelengths along with variances in
field distribution have been observed. In this study, we characterize the distribution of electric fields and the energy flow
in the metallic nanorod metamaterial by finite-difference time-domain (FDTD) method. We show that the direction of
energy flow is strongly correlated to the geometrical parameters of nanorod arrays and the wavelength. We estimated the
energy flow along a plasmonic waveguide and analyzed the field distribution in a unit cell corresponding to different
geometrical parameters and excitation wavelength. The results show that the dominant direction of energy flow is related
to the geometrical parameters and the excitation conditions. The reported phenomena for metallic nanorod metamaterials
may find numerous applications for guiding structures and sensors.
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