Switchable Electromagnetically Induced Transparency with Toroidal Mode in a Graphene-Loaded All-Dielectric Metasurface
| Autor: | Yong-Yuan Zhu, Sheng Peng, Xuejin Zhang, Guanghou Sun |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Electromagnetically induced transparency General Chemical Engineering Physics::Optics 02 engineering and technology Slow light 01 natural sciences electromagnetically induced transparency Article law.invention toroidal dipole 010309 optics lcsh:Chemistry law 0103 physical sciences General Materials Science switchable Optical filter Graphene business.industry graphene Resonance 021001 nanoscience & nanotechnology Dipole lcsh:QD1-999 dielectric metasurface Optoelectronics Photonics 0210 nano-technology business Magnetic dipole slow light |
| Zdroj: | Nanomaterials, Vol 10, Iss 1064, p 1064 (2020) Nanomaterials Volume 10 Issue 6 |
| ISSN: | 2079-4991 |
| Popis: | Active photonics based on graphene has attracted wide attention for developing tunable and compact optical devices with excellent performances. In this paper, the dynamic manipulation of electromagnetically induced transparency (EIT) with high quality factors (Q-factors) is realized in the optical telecommunication range via the graphene-loaded all-dielectric metasurface. The all-dielectric metasurface is composed of split Si nanocuboids, and high Q-factor EIT resonance stems from the destructive interference between the toroidal dipole resonance and the magnetic dipole resonance. As graphene is integrated on the all-dielectric metasurface, the modulation of the EIT window is realized by tuning the Fermi level of graphene, engendering an appreciable modulation depth of 88%. Moreover, the group velocity can be tuned from c/1120 to c/3390. Our proposed metasurface has the potential for optical filters, modulators, and switches. |
| Databáze: | OpenAIRE |
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