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Theoretical analysis of nonlinear surface wave absorbing metasurfaces
Optics Express
|February 7, 2018
Summary
Nonlinear surface wave absorbers using ideal diodes convert most power to DC, offering superior bandwidth and attenuation compared to linear absorbers. This technology enables high-performance absorption even with thin substrates.
Area of Science:
- Electromagnetics and Metamaterials
- Nonlinear Optics and Photonics
Background:
- Conventional linear surface wave absorbers have limitations in bandwidth and attenuation.
- Metasurfaces offer tunable electromagnetic properties but often require specific designs for optimal absorption.
Purpose of the Study:
- To theoretically analyze and demonstrate the principles of nonlinear surface wave absorbers utilizing ideal diodes.
- To investigate the advantages of nonlinear absorbers over linear counterparts in terms of bandwidth and attenuation.
- To explore the potential of diode-rectifier-based nonlinear absorbing metasurfaces for enhanced electromagnetic wave absorption.
Main Methods:
- Theoretical analysis of nonlinear surface wave absorber principles with ideal diodes.
- Modeling of surface currents and nonlinear harmonic generation (DC, 2f0, 4f0).
- Full-wave simulations of diode-rectifier-based nonlinear absorbing metasurfaces.
Main Results:
- Rectification of surface currents by ideal diodes converts significant power to DC, enabling complete absorption.
- Nonlinear absorbers demonstrate superior bandwidth and attenuation compared to linear absorbers.
- Achieved >60% relative bandwidth with thin substrates (0.35 mm), exceeding linear metasurface performance by three times.
Conclusions:
- Diode-based nonlinear metasurfaces offer significant advantages over linear absorbers.
- The proposed nonlinear absorbers provide a pathway to broadband and high-performance electromagnetic wave absorption.
- Practical implementation considerations and differences between theoretical and practical cases are addressed.
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