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Microwave and optical saturable absorption in graphene.
Zhiwei Zheng1, Chujun Zhao, Shunbin Lu
1College of Information Science and Engineering, Hunan University, Changsha 410082, China.
Optics Express
|November 29, 2012
Summary
Graphene exhibits saturable absorption properties, decreasing microwave absorbance with increasing power. This broadband saturable absorber functions effectively in both microwave and optical frequency bands.
Area of Science:
- Materials Science
- Optics and Photonics
- Microwave Engineering
Background:
- Saturable absorption is a key property for optical limiting and mode-locking.
- Graphene's unique electronic properties suggest potential for broadband applications.
Purpose of the Study:
- To investigate graphene's saturable absorption at microwave frequencies.
- To confirm graphene's broadband saturable absorption capabilities.
Main Methods:
- Experimental measurement of microwave absorbance versus incident power.
- Open-aperture Z-scan technique using lasers at telecommunication and 1053 nm bands.
Main Results:
- Graphene demonstrated microwave saturable absorption, independent of incident frequency.
- Absorbance saturated at powers above 80 µW for microwave frequencies.
- Optical saturable absorption was confirmed in both telecommunication and 1053 nm bands.
Conclusions:
- Graphene acts as a broadband saturable absorber.
- Graphene is suitable for applications in both microwave and optical domains.
