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Steering light by a sub-wavelength metallic grating from transformation optics
Yadong Xu1, Yangyang Fu1, Huanyang Chen1
1College of Physics, Optoelectronics and Energy &Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, No. 1 Shizi Street, Suzhou 215006, China.
Scientific Reports
|July 18, 2015
Summary
This study introduces a practical design for metasurfaces using sub-wavelength gratings and gradient index materials, offering new functionalities beyond traditional transformation optics. This approach simplifies complex designs and enriches physical phenomena for advanced optical and acoustic devices.
Area of Science:
- Optics and Photonics
- Materials Science
- Acoustics
Background:
- Transformation optics enables novel devices like invisibility cloaks.
- Metasurfaces are typically designed using phase discontinuities.
- Existing transformation optics metasurfaces often involve complex material parameters.
Purpose of the Study:
- To propose a practical design for metasurfaces.
- To simplify the material complexity of transformation optics-based metasurfaces.
- To explore richer physics and functionalities in metasurface design.
Main Methods:
- Utilizing sub-wavelength metallic gratings.
- Incorporating discrete and gradient index materials.
- Applying principles derived from transformation optics.
Main Results:
- A practical metasurface design with simplified material parameters.
- Inheritance of functionalities from phase discontinuity metasurfaces.
- Demonstration of richer physical phenomena compared to conventional designs.
Conclusions:
- The proposed sub-wavelength grating design offers a practical alternative for metasurface fabrication.
- This approach provides a pathway for developing advanced acoustic metasurfaces, particularly those using anisotropic metamaterials.
- The design enriches the physical understanding and applications of metasurfaces.
