TY - JOUR
T1 - Negative refraction and energy-transmission efficiency of acoustic waves in two-dimensional phononic crystal
T2 - Numerical and experimental study
AU - Kasai, Yuuki
AU - Tsuruta, Kenji
AU - Fujimori, Kazuhiro
AU - Fukano, Hideki
AU - Nogi, Shigeji
PY - 2011/6
Y1 - 2011/6
N2 - The negative refraction of acoustic waves in a two-dimensional phononic-crystal slab is studied by numerical simulation based on the finitedifference time-domain (FDTD) method and by ultrasonic measurement. The incident-angle dependences of energy-transmission efficiency in the simulation and experiment are in good agreement in the frequency range of approximately 1.2 MHz. Using the FDTD method, we optimize the efficiency by varying structural parameters such as filling fraction and slab thickness. The effect of deviation from the ideal crystallinity is also evaluated quantitatively via the simulation. These results indicate that an energetically efficient acoustic lens can be fabricated by carefully optimizing the structure of the phononic crystal.
AB - The negative refraction of acoustic waves in a two-dimensional phononic-crystal slab is studied by numerical simulation based on the finitedifference time-domain (FDTD) method and by ultrasonic measurement. The incident-angle dependences of energy-transmission efficiency in the simulation and experiment are in good agreement in the frequency range of approximately 1.2 MHz. Using the FDTD method, we optimize the efficiency by varying structural parameters such as filling fraction and slab thickness. The effect of deviation from the ideal crystallinity is also evaluated quantitatively via the simulation. These results indicate that an energetically efficient acoustic lens can be fabricated by carefully optimizing the structure of the phononic crystal.
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U2 - 10.1143/JJAP.50.067301
DO - 10.1143/JJAP.50.067301
M3 - Article
AN - SCOPUS:79959429156
VL - 50
JO - Japanese Journal of Applied Physics
JF - Japanese Journal of Applied Physics
SN - 0021-4922
IS - 6 PART 1
M1 - 067301
ER -