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Nanoporous gold nanoleaf as tunable metamaterial
Sangeeta Rout1, Zhen Qi2, Monika M Biener2
1Center for Materials Research, Norfolk State University, Norfolk, VA, 23504, USA.
Scientific Reports
|January 20, 2021
Summary
We studied nanoporous gold leaf (NPGL) metamaterials, observing unique transmission spectra with two peaks. These tunable optical properties are controlled by external environments, enabling new functionalities.
Area of Science:
- Materials Science
- Optics and Photonics
- Nanotechnology
Background:
- Nanoporous gold leaf (NPGL) metamaterials exhibit unique optical properties.
- Understanding their transmission spectra is crucial for advanced applications.
Purpose of the Study:
- To investigate the optical properties of single-layer and multi-fold NPGL metamaterials.
- To explain the observed unusual transmission spectra.
- To explore the tunability of NPGL metamaterials by external factors.
Main Methods:
- Fabrication and characterization of single-layer and multi-fold NPGL metamaterials.
- Measurement of transmission spectra.
- Analysis of optical phenomena using surface plasmon resonance principles.
- Environmental control using dielectric media and electrochemical cells.
Main Results:
- Observed highly unusual transmission spectra with two well-resolved peaks in NPGL metamaterials.
- Explained the spectra as a combination of surface plasmon absorption and broader transmission bands.
- Demonstrated control over transmission spectra by altering external dielectric environments (e.g., water) and applied voltage.
Conclusions:
- NPGL metamaterials display tunable and active optical properties.
- The observed spectral features are linked to surface plasmon interactions.
- External environmental control opens possibilities for novel applications in photonics and energy transfer.
