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Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
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Tunable plasmonic resonances in Si-Au slanted columnar heterostructure thin films
Ufuk Kılıç1, Alyssa Mock2,3, René Feder4
1Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA. ufuk.kilic@huskers.unl.edu.
Scientific Reports
|January 13, 2019
Summary
We fabricated porous silicon-gold nanostructures with tunable optical properties. These structures exhibit unique plasmonic modes, showing potential for highly sensitive plasmonic sensors.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Fabrication of nanostructure superlattices with controlled porosity and anisotropy is challenging.
- Understanding the optical properties of such complex heterostructures requires advanced characterization and modeling.
Purpose of the Study:
- To fabricate spatially-coherent, porous columnar plasmonic nanostructure thin films.
- To investigate the anisotropic optical properties and plasmonic modes of silicon-gold (Si-Au) heterostructures.
- To demonstrate the potential of these structures for sensing applications.
Main Methods:
- Glancing angle deposition (GAD) for fabricating slanted columnar heterostructures.
- Repeated silicon and gold depositions to create nanometer-dimension subcolumns.
- Generalized spectroscopic ellipsometry and finite element method (FEM) computations for optical analysis.
Main Results:
- Achieved high porosity and strong optical anisotropy in Si-Au columnar films.
- Observed a localized plasmonic mode with quadrupole-like characteristics, tunable in the near-infrared.
- Identified coupled-plasmon-like and inter-band transition-like modes in visible and UV regions.
Conclusions:
- Si-Au slanted columnar heterostructures possess tunable, anisotropic optical properties.
- The observed plasmonic modes are linked to the nanostructure geometry.
- These materials show promise as highly sensitive plasmonic sensors for detecting low solvent concentrations.
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