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Active tunable absorption enhancement with graphene nanodisk arrays
Zheyu Fang1, Yumin Wang, Andrea E Schlather
1School of Physics, State Key Lab for Mesoscopic Physics, Peking University , Beijing 100871, China.
Nano Letters
|December 11, 2013
Summary
Researchers enhanced graphene
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Graphene possesses excellent electronic properties but suffers from weak optical absorption, limiting its use in optoelectronics.
- Improving graphene's light absorption is crucial for unlocking its potential in various optical applications.
Purpose of the Study:
- To significantly enhance the optical absorption of graphene in the infrared spectrum.
- To investigate the impact of nanostructure geometry on graphene's absorption properties.
- To demonstrate the voltage tunability of this enhanced absorption for device applications.
Main Methods:
- Fabrication of graphene nanodisk arrays with controlled size and spacing.
- Optical characterization of the nanostructured graphene.
- Integration of graphene nanodisk arrays into an active electro-optic device.
Main Results:
- Nanopatterning graphene into nanodisks increased infrared absorption efficiency from <3% to 30%.
- Enhanced absorption was dependent on nanodisk size and interparticle spacing.
- The absorption enhancement was demonstrated to be voltage-tunable in an active device.
Conclusions:
- Graphene nanodisk arrays offer a viable strategy to overcome graphene's weak optical absorption.
- This approach significantly boosts infrared light absorption for optoelectronic applications.
- The voltage-tunable nature of nanopatterned graphene shows promise for novel infrared electro-optic devices.
