Broadband planar electromagnetic hyperlens with uniform magnification in air

Abstract

A planar hyperlens, capable of creating sub-wavelength imaging for broadband electromagnetic waves, is designed based on an electromagnetic null medium. Subsequently, a scheme for the implementation of the proposed hyperlens 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 hyperlens designed with flexural metal plates can achieve super-resolution imaging for microwave at operating wavelength (λ0 = 3 cm) with a resolution of 0.25λ0 and a uniform magnification of about 5. Moreover, the designed hyperlens ensure that both the object and image surfaces are planes and simultaneously provides a uniform magnification for objects in different positions. Additionally, the proposed hyperlens offer broadband super-resolution imaging capabilities, achieving good super-resolution imaging effects for microwave frequencies ranging from 8.3 to 11.3 GHz. The proposed hyperlens may find applications in high precision imaging, detection, and sensing.