Negative Refraction of Acoustic Waves in a Two-Dimensional Phononic Crystal via FDTD Simulation
نویسندگان
چکیده
Negative refraction of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finitedifference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal cylinders placed periodically in a liquid. By comparing several combinations of materials for metal cylinder and liquid, we analyze the dependence of the band structures on sound speed and density of liquid media. The negative refraction of the acoustic waves is observed at the interfaces between the phononic crystal slab and the liquid. We find that an acoustic ‘‘lens effect’’ with the slab appears due to the negative refractions. The relationship between the focal intensity in the lens effect and the band structure of the phononic crystal is quantitatively discussed. [doi:10.2320/matertrans.MC200823]
منابع مشابه
Investigation tow of negative refraction characters in the three different 2D phononic crystals
In this paper, a two-dimensional phononic crystal comprising of steel rod in water is investigated. Three cross- sections for this rod are considered using finite element method (EFM). We plot the equifrequency surface of the first band, because of equifrequency surface convex around the edge of the first Brillouin Zone, we guess the negative effective phononic mass and so negative refraction. ...
متن کاملDesign and Simulation of a New Highly Sensitive Gas Sensor Based on Negative Refraction Photonic Crystal
In this paper, design and simulation of a new highly sensitive gas sensor based on a hybrid photonic crystal (PC) structure, containing negative and positive refractive index sections, is presented. It has been shown that using a PC with negative refraction in the first section, the transmitted power is concentrated on the entrance of the sensing channel, and the transmission of the proposed se...
متن کاملExperimental evidence of high-frequency complete elastic bandgap in pillar-based phononic slabs
Articles you may be interested in Subwavelength waveguiding of surface phonons in pillars-based phononic crystal Superlensing effect for surface acoustic waves in a pillar-based phononic crystal with negative refractive index Appl. Simulations of acoustic waves bandgaps in a surface of silicon with a periodic hole structure in a thin nickel film Finite element analysis and experimental study of...
متن کاملRefraction of surface acoustic waves through 2D phononic crystals
We report on the first experimental evidence of negative refraction of surface acoustic waves, through a prism-shaped 2D phononic crystal having a solid matrix. The sample is constituted by a periodic array of air holes drilled in a Si substrate. The experiments are performed using a laser-ultrasonic technique.
متن کاملNegative refraction and focusing of ultrasound in two-dimensional phononic crystals
We present experimental demonstrations of negative refraction and focusing of ultrasonic waves in twodimensional phononic crystals made of stainless steel rods assembled in a triangular lattice and immersed in a liquid. Negative refraction is achieved for the range of frequencies in the second band, where the directions of the wave vector and group velocity are antiparallel to each other due to...
متن کامل