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Ultrafast modulation of optical metamaterials
David J Cho1, Wei Wu, Ekaterina Ponizovskaya
1Department of Physics, University of California at Berkeley, Berkeley, California 94720, USA.
Optics Express
|November 13, 2009
Summary
We demonstrate femtosecond optical response modulation in fishnet metamaterials. Plasmon resonance dramatically enhances modulation strength, suggesting applications in high-speed terahertz modulators.
Area of Science:
- Optics and Photonics
- Materials Science
- Nanotechnology
Background:
- Metamaterials offer unique optical properties.
- Controlling optical responses at high speeds is crucial for advanced photonic devices.
Purpose of the Study:
- To investigate the ultrafast optical response modulation of fishnet metamaterials.
- To understand the role of plasmon resonance in modulation dynamics.
Main Methods:
- Utilizing pump-probe spectroscopy.
- Analyzing pump-induced spectral changes in the metamaterial.
Main Results:
- Demonstrated femtosecond time-scale optical modulation of fishnet metamaterials.
- Identified pump-induced dielectric changes as the primary modulation mechanism.
- Showcased significant enhancement of modulation strength via plasmon resonance.
Conclusions:
- Fishnet metamaterials exhibit ultrafast optical modulation capabilities.
- Plasmon resonance plays a key role in enhancing modulation efficiency.
- These findings suggest potential for metamaterials in high-speed terahertz amplitude/phase modulators.
