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Microfabrication of Nanoporous Gold Patterns for Cell-material Interaction Studies
Published on: July 15, 2013
Light splitting in nanoporous gold and silver.
Michel Bosman1, Geoffrey R Anstis, Vicki J Keast
1Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, 117602, Singapore. michel.bosman@gmail.com
ACS Nano
|December 14, 2011
Summary
Nanoporous gold and silver absorb light broadly due to nanoscale light splitting. This phenomenon, driven by localized surface plasmon resonances, allows for tunable optical properties in these unique materials.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Nanoporous gold and silver display unusual black appearance, contrasting with the typical luster of bulk gold and silver.
- These materials exhibit strong, omnidirectional, broad-band light absorption in the far-field.
Purpose of the Study:
- To elucidate the origin of the anomalous optical properties of nanoporous gold and silver.
- To investigate the relationship between material morphology and optical characteristics.
Main Methods:
- Utilized nanoscale electron energy loss spectroscopy (EELS) for high-resolution analysis.
- Employed discrete dipole approximation (DDA) and boundary element method (BEM) simulations.
- Imaged and analyzed localized surface plasmon resonances (LSPRs) with nanometer spatial resolution.
Main Results:
- Established that broad-band absorption arises from nanoscale light splitting and local color variations.
- Demonstrated the excitation of localized surface plasmon resonances as the cause of absorption.
- Showcased the ability to tune absorbance and reflectance by altering nanoporous film morphology.
Conclusions:
- The unique optical properties of nanoporous metals are attributed to LSPRs and nanoscale light interactions.
- Morphology control offers a pathway to engineer the optical response of nanoporous materials.
- This research provides fundamental insights for designing novel plasmonic materials.
