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Multiple dipolar resonant silicon-based metamaterials for high-performance optical switching and sensing
Optics Express
|October 27, 2022
Summary
This study introduces a novel graphene-silicon metamaterial platform that achieves ultra-sharp resonances for advanced optical sensing and switching. The design enables high sensitivity and figure of merit (FOM) for optoelectronic applications.
Area of Science:
- Optoelectronics
- Metamaterials Science
- Nanophotonics
Background:
- Dielectric nanostructures are crucial for enhancing light-matter interactions in optoelectronics.
- Manipulating geometric parameters of nanostructures offers control over their optical properties.
- Graphene-silicon combined metamaterials present a promising platform for novel optical functionalities.
Purpose of the Study:
- To numerically demonstrate a new graphene-silicon metamaterial platform.
- To achieve multiple dipolar resonant behaviors, high-performance optical switching, and sensitive optical sensing.
- To explore the potential for strong light-matter interactions and multispectral optoelectronics.
Main Methods:
- Construction and numerical simulation of all-dielectric metamaterials (ADMs) with broken symmetry.
- Excitation of ultra-sharp resonances using two silicon trapezoidal bodies on a silica substrate.
- Analysis of electromagnetic field and current density distributions to understand multipole mode excitation.
- Investigation of geometric parameter influences (period, thickness, asymmetry) and polarization angle.
- Tuning graphene's Fermi levels for optical switching and calculating sensing performance.
Main Results:
- Multiple ultra-narrowband resonances excited in the near-infrared range due to multipole modes.
- Demonstration of optical switching with 95% amplitude modulation efficiency by adjusting graphene's Fermi levels.
- Achieved high sensitivity of 447.5 nm/RIU and a figure of merit (FOM) of 1173 RIU⁻¹ for optical sensing.
- Identified influence of geometric parameters and polarization angle on resonant behaviors.
Conclusions:
- The developed graphene-silicon metamaterial platform enables high-quality ultra-sharp resonant responses.
- This platform offers significant potential for developing advanced optical sensors, notch filters, and nonlinear optics.
- The study provides new insights into achieving strong light-matter interactions for multispectral optoelectronic applications.
