Broadband planar electromagnetic hyper-lens with uniform magnification in air

TL;DR

This paper presents a broadband planar hyper-lens using flexural metal plates that achieves super-resolution microwave imaging with uniform magnification across a broad frequency range.

Contribution

It introduces a novel hyper-lens design based on electromagnetic null medium and flexural metal plates for broadband super-resolution imaging.

Findings

Achieves 0.25λ0 resolution at 3cm wavelength

Provides uniform magnification of about 5

Operates effectively from 8.5 to 11 GHz

Abstract

A planar hyper-lens, capable of creating sub-wavelength imaging for broadband electromagnetic wave, is designed based on electromagnetic null medium. Subsequently, a scheme for the implementation of the proposed hyper-lens is given by using well-designed flexural metal plates, which function as the reduced electromagnetic null medium for TM-polarized microwaves. Both simulated and measured results verify that the hyper-lens designed with flexural metal plates can achieve super-resolution imaging for microwave at operating wavelength ({\lambda}0=3cm) with a resolution of 0.25{\lambda}0 and a uniform magnification of about 5. Moreover, the designed hyper-lens ensures that both the object and image surfaces are planes, and simultaneously provides a uniform magnification for objects in different positions. Additionally, the proposed hyper-lens offers a broadband super-resolution imaging capabilities, achieving good super-resolution imaging effects for microwave frequencies ranging from 8.5 to 11 GHz. The proposed hyper-lens may find applications in high precision imaging, detection, and sensing.