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A novel plasmonic nanostructure for localized near-field light enhancement
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The combination of plasmonic structures with dielectric materials, metallic oxides and in
particular, with two dimensional (2D) materials has been a subject of great interest in the scientific
community for a wide range of applications, such as optoelectronic devices, solar cells, or
photochemistry. Plasmonic properties have the potential to enhance the capabilities of 2D
materials for harvesting light, which alone have a low efficiency due to low absorption
(approximately only 11%). This work presents a new plasmonic structure, “nanohippo” with a
perspective to integrate a monolayer material inside the cavity, being this nanostructure directly
excited by the incident light taking advantage of localized surface plasmonic resonance (LSPR).
The samples were prepared by colloidal lithography and material deposition was made through
an electron beam assisted evaporation system. A fabrication method was developed to create a
cavity by using a sacrificial material and etching it later on. The sample’s characterization
consisted in a morphologic analysis by Scanning Electron Microscopy (SEM), the optical
response was studied both theoretically and experimentally by Finite-difference-time-domain
(FDTD) as well as experimentally by spectrophotometry. Finally, an elemental analysis was
performed via X-ray photoelectron microscopy (XPS). The diameter and height of the structures
were studied (different sizes nanoparticles and thicker layers of bottom layer gold) reaching to a
structure that presented a plasmonic cavity. This nanostructure, with a new geometry, presented
a visible plasmonic nanocavity with up to sixty times more enhancement of the electrical field
inside it.
Descrição
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plasmonic nanostructure Localized surface plasmonic resonance colloidal lithography 2D materials integration