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Light absorber based on nano-spheres on a substrate reflector
1Optics and Photonics, School of Information and Communication Technology, KTH - Royal Institute of Technology, Electrum 229, 164 40 Kista, Sweden.
Optics Express
|April 3, 2013
Summary
This study explores gold nano-sphere plasmonic absorbers, finding gap plasmons dominate absorption at close particle distances. This research paves the way for efficient, large-area light absorber fabrication.
Area of Science:
- Nanotechnology
- Plasmonics
- Optical Materials
Background:
- Plasmonic nanostructures offer unique light absorption properties.
- Efficient light absorbers are crucial for various optical applications.
Purpose of the Study:
- To systematically investigate plasmonic light absorbers composed of gold nano-spheres on a gold substrate.
- To understand the influence of structural parameters on light absorption resonance.
Main Methods:
- Utilized a 3D finite-element method for numerical simulations.
- Fabricated a plasmonic absorber using chemically-synthesized gold nanoparticles with a silica shell.
Main Results:
- Identified gap plasmon coupling as the primary mechanism for high absorption at ~1 nm inter-particle separation.
- Observed a characteristic absorption band around 810 nm with ~90% absorbance in the fabricated device.
- Numerical calculations showed good agreement with experimental results.
Conclusions:
- The study elucidates the plasmonic mechanisms governing light absorption in nano-sphere arrays.
- The developed fabrication technique is scalable for creating efficient, large-area plasmonic light absorbers.
