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Updated: May 11, 2026
10:26
Fabrication and Characterization of Superconducting Resonators
Published on: May 21, 2016
Fano resonance in concentric ring apertures.
Jie Shu1, Weilu Gao, Qianfan Xu
1Department of Electrical and Computer Engineering, Rice University, Houston, TX 77005, USA.
Optics Express
|May 15, 2013
Summary
We show a polarization-independent mid-infrared Fano resonance using concentric metallic rings. This enables extraordinary light transmission by coupling bright and dark optical modes, with the dark mode showing higher quality factor.
Area of Science:
- Optics and Photonics
- Plasmonics
- Nanophotonics
Background:
- Fano resonances in plasmonic nanostructures offer unique optical properties.
- Controlling the coupling between optical modes is crucial for tailoring transmission spectra.
- Mid-infrared applications require polarization-independent optical components.
Purpose of the Study:
- To demonstrate a polarization-independent Fano resonance in the mid-infrared.
- To achieve extraordinary optical transmission using coupled plasmonic modes.
- To analyze the coupling dynamics between bright and dark modes in metallic ring apertures.
Main Methods:
- Fabrication and characterization of dual concentric metallic ring apertures.
- Optical measurements in the mid-infrared spectral range.
- Analysis using a coupled optical resonator model.
Main Results:
- Observed polarization-independent Fano resonance with extraordinary transmission.
- Indirect excitation of a high-quality (high-Q) dark mode coupled to a low-Q bright mode.
- Dark mode Q factor found to be 3-6 times higher than the bright mode Q factor.
- Demonstrated selective disabling of the dark mode without affecting the bright mode.
Conclusions:
- Dual concentric metallic rings enable efficient Fano resonance for enhanced transmission.
- The coupled resonator model accurately describes the observed mode coupling.
- This work provides a pathway for designing tunable optical filters and sensors in the mid-infrared.
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