Wideband backscattering reduction at terahertz using compound reflection grating.

Area of Science:

• Optics and Photonics
• Metamaterials
• Terahertz Technology

Background:

• Traditional backscattering reduction methods often rely on absorbers or diffraction gratings, which typically suffer from narrow operational bandwidths.
• Achieving broadband backscattering reduction is crucial for various applications, including stealth technology and electromagnetic compatibility.

Purpose of the Study:

• To propose and demonstrate a novel metallic compound reflection grating (CRG) for achieving strong and broadband backscattering reduction.
• To investigate the mechanism of backscattering reduction using CRG in the terahertz (THz) frequency range.

Main Methods:

• Theoretical analysis using equivalent circuit models.
• Numerical simulations to analyze the electromagnetic response of the CRG structure.
• Fabrication and experimental validation of a prototype CRG operating at 0.35 THz.

Main Results:

• The proposed CRG structure enables significant backscattering reduction.
• Broadband performance was achieved with a fractional bandwidth (FBW) of approximately 57%.
• The CRG efficiently transfers incident energy to diffracted modes, minimizing backscattered radiation.

Conclusions:

• The metallic compound reflection grating (CRG) offers a promising solution for broadband backscattering reduction in the terahertz spectrum.
• The experimental results validate the design principles and simulation predictions.
• This technology has potential applications in THz systems requiring reduced radar cross-section or improved electromagnetic interference mitigation.