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Plasmon-Induced Transparency in an Asymmetric Bowtie Structure.
Wei Wei1,2, Xin Yan3, Bing Shen4
1School of Mechanical and Electric Engineering, Guangzhou University, Guangzhou, 510006, China. wei.wei@outlook.ie.
Nanoscale Research Letters
|July 25, 2019
Summary
We developed an on-chip plasmon-induced transparency device using an asymmetric bowtie structure. This technology mimics electromagnetically induced transparency, enabling efficient light propagation for optical communications.
Area of Science:
- Optoelectronics
- Nanophotonics
- Metamaterials
Background:
- Plasmon-induced transparency (PIT) offers a method to overcome medium opacity for electromagnetic waves, mimicking electromagnetically induced transparency (EIT).
- On-chip integration is crucial for advanced optical communication systems.
Purpose of the Study:
- To propose and demonstrate an on-chip PIT device for optical communications.
- To investigate the strong coupling mechanism in asymmetric bowtie resonators for PIT realization.
Main Methods:
- Fabrication of an aperture-side-coupled asymmetric bowtie structure.
- Utilizing coupled detuned bowtie triangular resonators acting as Fabry-Perot cavities.
- Analyzing the strong coupling dynamics between resonators.
Main Results:
- Achieved on-chip plasmon-induced transparency in the optical communications band.
- Demonstrated control over the transparent peak wavelength via resonator height.
- Observed a high extinction ratio (>10 dB) between absorption valley and transparent peak.
- Exhibited excellent linearity for sensing applications based on refractive index changes.
Conclusions:
- The proposed asymmetric bowtie structure effectively realizes on-chip PIT.
- The device shows potential for high-performance optical sensing due to its sensitivity and robustness.
- This technology is promising for applications in optical communications and integrated photonics.
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