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Coupling the normal incident light into waveguide modes of DBR mirrors via a diffraction grating
Wenhong Yang1, Shang Sun1, Chen Zhang1
1Department of Material Science and Engineering, Harbin Institute of Technology, Shenzhen, 518055, China.
Scientific Reports
|December 14, 2016
Summary
We demonstrate converting light into guiding modes using a gold grating on a distributed Bragg reflector (DBR) mirror. This robust Fano resonance coupling offers practical applications for light manipulation.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Distributed Bragg reflector (DBR) mirrors are crucial for controlling light.
- Efficiently coupling normally incident light into DBRs remains a challenge.
Purpose of the Study:
- To demonstrate and investigate the conversion of normally incident light into guiding modes of a DBR mirror.
- To explore the underlying mechanism of Fano resonances for this conversion.
Main Methods:
- Fabrication of a gold grating on a TiO2/SiO2 DBR mirror.
- Numerical calculations and experimental verification of light-DBR interactions.
- Analysis of asymmetrical Fano resonances within the DBR bandgap.
Main Results:
- Successfully created asymmetrical Fano resonances at the DBR bandgap.
- Attributed these resonances to the coupling of incident light into DBR guiding modes.
- Demonstrated the robustness of this coupling mechanism to environmental variations.
Conclusions:
- The fabricated gold grating enables efficient conversion of light into DBR guiding modes.
- Fano resonances provide a simple and robust mechanism for light coupling.
- This method holds significant potential for various optical applications.
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