Monolayer-Graphene-Based Tunable Absorber in the Near-Infrared
| Autor: | Qi Wang, Xufeng Gao, Shuhua Cao, Shijie Zhang, Ruijin Hong, Dawei Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Physics::Optics Grating Article law.invention law sensor TJ1-1570 absorber Mechanical engineering and machinery Electrical and Electronic Engineering Absorption (electromagnetic radiation) business.industry Graphene Mechanical Engineering Near-infrared spectroscopy graphene Fano resonance Fermi energy Polarization (waves) Wavelength Control and Systems Engineering Optoelectronics business |
| Zdroj: | Micromachines Volume 12 Issue 11 Micromachines, Vol 12, Iss 1320, p 1320 (2021) |
| ISSN: | 2072-666X |
| DOI: | 10.3390/mi12111320 |
| Popis: | In this paper, a tunable absorber composed of asymmetric grating based on a graphene-dielectric-metal structure is proposed. The absorption of the absorber can be modified from 99.99% to 61.73% in the near-infrared by varying the Fermi energy of graphene, and the absorption wavelength can be tuned by varying the grating period. Furthermore, the influence of other geometrical parameters, the incident angle, and polarization are analyzed in detail by a finite-difference time-domain simulation. The graphene absorbers proposed in this paper have potential applications in the fields of stealth, sense, and photoelectric conversion. When the absorber that we propose is used as a gas sensor, the sensitivity of 200 nm/RIU with FOM can reach up to 159 RIU−1. |
| Databáze: | OpenAIRE |
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