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Enhanced plasmonic light absorption engineering of graphene: simulation by boundary-integral spectral element method
Optics Express
|April 4, 2015
Summary
Researchers enhanced graphene light absorption for photodetectors using gold nanoparticles and Bragg reflectors. This approach boosts photo-responsivity by exciting localized surface plasmon resonance, achieving 67.54% absorption.
Area of Science:
- Nanophotonics
- Materials Science
- Optoelectronics
Background:
- Graphene exhibits low light absorption, limiting its use in photonic devices.
- Enhancing graphene's photo-responsivity requires improved light absorption capabilities.
Purpose of the Study:
- To investigate methods for enhancing tunable light absorption in graphene.
- To explore the use of plasmon resonance in graphene-based photodetectors.
Main Methods:
- Theoretical study of periodic cuboid and cylindrical gold nanoparticle (NP) arrays with Bragg reflectors.
- Numerical analysis using the boundary-integral spectral element method (BI-SEM).
Main Results:
- The proposed structures effectively tune light absorption in graphene via plasmon resonance.
- A maximum graphene light absorption of 67.54% was achieved within the 300-1000 nm spectra.
- BI-SEM provided accurate and efficient numerical simulations.
Conclusions:
- Incorporating gold NP arrays and Bragg reflectors is a viable strategy to enhance graphene absorption.
- The findings pave the way for developing highly responsive graphene-based photodetectors.
