Nanoscale surface corrugation strongly
influences the propagation
of plasmons and its induced characteristics in self-organized periodic
nanostructures. Here, the role of varying surface roughness and thickness
in periodic nanostructures of a self-assembled CuS system has been
reported. The mixing of surfactants is used to translate the contrary
type of clustering processes in a bottom-up fabrication method. X-ray
diffraction (XRD) study identifies the improved crystallinity and
quantization effects for invariable hexagonal crystal structures.
The elaboration of Raman measurements has distinguished the formulated
interlayer soft phonon modes from interlayer electron–phonon
interactions that gave split-off features in surface enhanced Raman
scatterings (SERS). The absorption spectra in linear and diffuse reflectance
geometry monitor the scattering of the exciton–plasmon field
in terms of defect states, Urbach’s energy, and optical gap.
The true nature of periodic energy exchange between exciton–plasmon
coupled systems has been derived from the Drude–Lorentz oscillator
model fitting to near-normal incidence reflectance spectra. The effects
on a dimensionally constrained plasmon’s momentum space and
phase velocities are visible in the extraordinary optical behavior
of the derived refractive index and dielectric constants. The correlative
study on electronic, oxidation, and valence states has been reported
using X-ray photoelectron spectroscopy (XPS) measurements. This approach
of fabrication and characterization is expected to overcome the major
roadblocks for the formation of metamaterials with identical large
arrays for photonic devices.
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