Acoustic Luneburg lens (ALL) is a spherically/circularly symmetric gradient refractive index
lens, whose index varies smoothly from the outer surface to the centre. The variation of the …

In this paper, a novel gradient index (GRIN) structural lens based on the concept of
generalized Luneburg lens (GLL) is proposed. This lens allows for the realization of double …

Ray tracing in gradient-index (GRIN) media has been thoroughly studied and several ray
tracing methods have been proposed. Methods are based on finding the ray path given a …

A novel method for achieving sub-wavelength focusing of reflected flexural waves in a single-
phase plate is proposed in this paper. The original plane lens is divided into two adjacent …

This paper introduces spherical and ellipsoidal metamaterial lenses designed based on the
Luneburg lens and transformation optics for underwater ultrasound imaging, which …

We design an acoustic switch based on a spiral kirigami metasurface using numerical
simulations and evaluate its performance experimentally. By etching an Archimedean spiral …

In this paper, a modified Maxwell's fish-eye lens is proposed in order to achieve super-
resolution imaging. This lens possesses elevated refractive index profile compared with the …

Typically, as a means to obtain a less complicated ray tracing method on a gradient-index
(GRIN) medium, a normalization is done. This normalization is based upon the fact that the …

This paper investigates the acoustic Luneburg Lens (ALL) as a design framework for guiding
acoustic wave propagation. In this study, an acoustic waveguide is proposed based on the …

The high-performance and aberration-free broadband acoustic lens holds promise for
extensive applications, yet remains challenged. In this work, a scheme is proposed, and the …