We have devised a thermal carpet cloak theoretically and implemented in silicon using layered metamaterial. The layered metamaterial is composed of single crystalline silicon and its phononic crystal. The design is based on a coordinate transformation. We demonstrate the result with numerical simulation. Great cloaking performance is achieved as a thermal insulator is well hidden under the ther...

We have experimentally investigated the effects of release hole size on acoustic transmission through micromachined phononic band gap crystals. The results confirm previous theoretical studies and determine the range of release hole sizes for which the band gap is minimally compromised. The experiments were performed on micro fabricated 2D phononic crystal plates comprised of high acoustic impe...

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In this paper, we review results obtained by ultrafast imaging of gigahertz surface acoustic waves in surface phononic crystals with one- and two-dimensional periodicities. By use of quasi-point-source optical excitation, we show how, from a series of images that form a movie of the travelling waves, the dispersion relation of the acoustic modes, their corresponding mode patterns and the positi...

in this paper, a new algorithm for studying elastic wave propagation in the phononic crystals is presented. at first, the displacement-based forms of elastic wave equations are derived and then the forms are discretized using finite difference method. so the new algorithm is called the displacement-based finite difference time domain (dbfdtd). three numerical examples are computed with this met...

The existence of phononic bandgaps is shown in a phononic crystal structure composed of a silicon plate with stubbed tungsten pillars. Using the finite element method for numerical simulations, the evolution of bandgap opening with varying design parameters is studied. Several bandgaps have been observed for different lattice symmetries. It has been shown that bandgaps of up to 40% gap to mid-g...

In the field of phononics, periodic patterning controls vibrations and thereby flow heat sound in matter. Bandgaps arising such phononic crystals realize low-dissipation vibrational modes enable applications towards mechanical qubits, efficient waveguides, state-of-the-art sensing. Here, we combine phononics two-dimensional materials explore possibility manipulating via applied pressure. To thi...

We propose the design of a tubular phononic crystal (TPC) for purpose sensing physical properties liquid filling hollow part tube. The TPC is constituted by periodic repetition washers along pipe with advantage avoiding any perturbation flowing fluid element inside Using finite simulations, we demonstrate existence complete as well polarization dependent bandgaps which one can localized modes a...

Surface waves in topological states of quantum matter exhibit unique protection from backscattering induced by disorders, making them ideal carriers for both classical and quantum information. Topological matters for electrons and photons are largely limited by the range of bulk properties, and the associated performance trade-offs. In contrast, phononic metamaterials provide access to a much w...