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Broadband absorption using all-graphene grating-coupled nanoparticles on a reflector.
Shiva Hayati Raad1, Zahra Atlasbaf2, Carlos J Zapata-Rodríguez3
1Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran. shiva.hayati@modares.ac.ir.
Scientific Reports
|November 5, 2020
Summary
This study introduces a novel optical absorber using graphene-wrapped nanoparticles. The design achieves enhanced bandwidth and efficient absorption across a wide frequency range, suitable for compact optoelectronic devices.
Area of Science:
- Plasmonics
- Optical Engineering
- Materials Science
Background:
- Localized surface plasmon resonances (LSPRs) are crucial for optical devices.
- Graphene's unique properties offer potential for advanced optical applications.
- Designing broadband optical absorbers with tunable properties remains a challenge.
Purpose of the Study:
- To design a nanoparticle-assisted optical absorber with enhanced bandwidth.
- To utilize hybridized LSPRs in a periodic assembly of graphene-wrapped nanoparticles.
- To achieve real-time biasing and broadband absorption for optoelectronic devices.
Main Methods:
- Designing a unit cell with two densely packed, crossly stacked graphene strips.
- Incorporating multiple plasmonic resonances (propagating surface plasmons and gap plasmons).
- Utilizing graphene strips with hyperbolic dispersion for bandwidth enhancement.
Main Results:
- Achieved dynamic bandwidth covering 18.16-40.47 THz with 90% efficiency using a two-state biasing scheme.
- Demonstrated high broadband absorption (>90%) for both TE and TM waves up to 40° incident angles.
- The absorber exhibits symmetry, lightweight properties, and sub-wavelength dimensions.
Conclusions:
- The proposed graphene-based optical absorber offers significant bandwidth enhancement and efficient absorption.
- The design allows for easy real-time biasing without complex electrical connections.
- The lightweight, compact nature makes it suitable for advanced optoelectronic applications.
