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Low-Threshold and High-Extinction-Ratio Optical Bistability within a Graphene-Based Perfect Absorber
Zhengzhuo Zhang1, Qiaoge Sun1, Yansong Fan1
1College of Advanced Interdisciplinary Studies & Hunan Provincial Key Laboratory of Novel Nano-Optoelectronic Information Materials and Devices, National University of Defense Technology, Changsha 410073, China.
Nanomaterials (Basel, Switzerland)
|February 11, 2023
Summary
Researchers developed a graphene perfect absorber for optical bistability. This device achieves low thresholds and high extinction ratios, paving the way for advanced all-optical communication devices.
Area of Science:
- Photonics and Optical Engineering
- Materials Science and Nanotechnology
Background:
- Graphene exhibits significant nonlinear optical properties.
- Perfect absorbers enhance light-matter interactions, crucial for nonlinear optical phenomena.
Purpose of the Study:
- To propose and simulate a graphene-based perfect absorber capable of generating optical bistability.
- To investigate the low-threshold and high-extinction-ratio characteristics of the proposed device in the near-infrared band.
Main Methods:
- Numerical simulations were employed to model the graphene-based perfect absorber.
- Analysis focused on the light-graphene interaction and its contribution to nonlinear optical responses.
Main Results:
- The proposed absorber demonstrates low switching thresholds, below 2.5 MW/cm², due to strong light-graphene interaction and graphene's nonlinearity.
- An ultrahigh extinction ratio of 47.3 dB was achieved at 1545.3 nm.
- The structure shows tolerance to variations in structural parameters.
Conclusions:
- The graphene-based perfect absorber offers a promising platform for achieving optical bistability with desirable performance metrics.
- Its compact size, low thresholds, high extinction ratio, and ultrafast response time make it suitable for high-performance all-optical communication devices.
