# Transmissive Suppressed-Order Diffraction Grating (SODG)

## TL;DR

This paper introduces a transmissive Suppressed-Order Diffraction Grating (SODG) that achieves high-efficiency electromagnetic deflection at large angles with a deeply subwavelength thickness, demonstrating 90% efficiency at 70 degrees.

## Contribution

It presents the design and demonstration of a novel transmissive SODG with high efficiency and large-angle deflection in the microwave regime, a significant advancement over existing diffraction gratings.

## Key findings

- Achieves 90% efficiency at 70 degrees.
- Operates effectively at 10.5 GHz.
- Features a deeply subwavelength thickness.

## Abstract

We present a novel type of Suppressed-Order Diffraction Grating(SODG). An SODG is a diffraction grating whose diffraction orders have all been suppressed except one that is selected to provide electromagnetic deflection. The proposed SODG is a transmissive grating that exhibits high-efficiency refraction-like deflection for all angles, including large angles that are generally challenging to achieve, while featuring a deeply subwavelength thickness, as required in the microwave regime. We first present the design rationale and guidelines, and next demonstrate such a 10.5 GHz SODG that reaches an efficiency of 90% at 70 degrees.