This paper presents a comprehensive review of the literature and trends on the design of
periodic microstructural composite materials including photonic crystals (PtCs), phononic …

Flexible manipulation of elastic and acoustic waves through phononic meta-structured
materials (PMSMs) has attracted a lot of attention in the last three decades and shows a …

Analog machine learning hardware platforms promise to be faster and more energy efficient
than their digital counterparts. Wave physics, as found in acoustics and optics, is a natural …

As the counterpart of electromagnetic and acoustic metamaterials, elastic metamaterials are
artificial periodic elastic composite materials offering the possibility to manipulate elastic …

This paper presents a systematic approach for designing 3D auxetic lattice materials, which
exhibit constant negative Poisson's ratios over large strain intervals. A unit cell model …

An acoustic topological insulator (TI) is synthesized using topology optimization, a free
material inverse design method. The TI appears spontaneously from the optimization …

The level set and density methods for topology optimization are often perceived as two very
different approaches. This has to some extent led to two competing research directions …

Wave propagation through a locally resonant metamaterial characterized by anisotropic
dynamic mass density is studied. The polarizations and velocities of waves are obtained …

This paper proposes a level set-based topology optimization method for acoustic
metasurfaces consisting of multiple types of unit cells. As a type of acoustic metasurface, we …

We theoretically and experimentally present the asymmetric acoustic transmission
phenomenon in a lossy gradient-index metasurface (GIM). The lossy GIM design is a …