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Broadband surface wave coupler with low infrared emission and microwave reflection
Optics Express
|November 23, 2021
Summary
This study introduces a novel metasurface design for simultaneous infrared emission reduction and microwave reflection suppression, enabling effective multispectral stealth applications. The broadband surface wave coupler also functions as a circular polarized wave discriminator.
Area of Science:
- Metamaterials and Nanophotonics
- Electromagnetics and Wave Manipulation
- Infrared and Microwave Engineering
Background:
- Metasurfaces offer advanced control over electromagnetic waves across multiple frequency bands, crucial for developing sophisticated stealth technologies.
- Simultaneous reduction of infrared emission and microwave reflection is a key challenge in achieving effective multispectral stealth.
- Pancharatnam-Berry (PB) phase gradient metasurfaces (PGMs) provide a versatile platform for manipulating electromagnetic wave properties.
Purpose of the Study:
- To propose and demonstrate a broadband surface wave coupler using thin Pancharatnam-Berry (PB) phase gradient metasurfaces (PGMs).
- To achieve simultaneous reduction of infrared emission and microwave reflection for multispectral stealth applications.
- To investigate the potential of the designed metasurface as a circular polarized (CP) wave discriminator.
Main Methods:
- Design of a thin (0.12λ₀) Pancharatnam-Berry (PB) phase gradient metasurface (PGM) coupler.
- Utilizing a high filling ratio of indium-tin-oxide (ITO) for low infrared emission.
- Employing conversion of propagating waves to surface waves for microwave reflection reduction.
- Simulations and experimental measurements to validate the proposed design's performance.
Main Results:
- The broadband surface wave coupler exhibits low infrared emissivity (< 0.28) in the 3–14 µm range.
- Significant microwave reflection reduction (> 10 dB) is achieved between 7.3–9.5 GHz.
- The metasurface effectively discriminates between orthogonal circular polarized waves by coupling them into surface waves propagating in opposite directions.
Conclusions:
- The proposed thin PGM-based broadband surface wave coupler offers a viable strategy for multispectral stealth.
- The design demonstrates dual functionality, achieving both infrared emission reduction and microwave reflection suppression.
- This work presents a promising alternative for developing multifunctional devices for advanced stealth and electromagnetic applications.
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