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【期刊论文】Negative refraction of acoustic waves in two-dimensional sonic crystals
陈延峰, Liang Feng, , Xiao-Ping Liu, Yan-Bin Chen, Zhi-Peng Huang, Yi-Wei Mao, Yan-Feng Chen, *, Jian Zi, and Yong-Yuan Zhu
PHYSICAL REVIEW B 72, 033108 (2005),-0001,():
-1年11月30日
Negative refractions of acoustic waves in a two-dimensional (2D) sonic crystal were studied both experimentally and theoretically. By calculating the acoustic band structure and equifrequency surfaces, we theoretically analyzed the acoustic single-beam negative refraction in the first band operating in the ultrasonic regime. A 2D square sonic crystal was constructed with 2.0-mm-diam steel cylinders arranged as square arrays of 2.5mm lattice constant. A scanning transmission measurement of spatial distribution was carried out to establish the acoustic refraction of a single Gaussian beam. It was demonstrated that the negative refraction is strongly dependent on both frequencies and incident angles, which shows great potential in acoustic devices.
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陈延峰
,-0001,():
-1年11月30日
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陈延峰, S.T. Zhang, a), M.H. Lu, D. Wu, Y.F. Chen, and N.B. Ming
Appl. Phys. Lett. 87, 262907 (2005),-0001,():
-1年11月30日
Single-phase insulating BiFeO3 ceramics have been synthesized by a simple but effective method that conventional solid state reaction is followed immediately by quenching processing. At room temperature, the ceramics show a metastable, distorted rhombohedral phase and the refined structure parameters are presented based on x-ray diffraction. It is revealed that the formations of Fe2+ and oxygen deficiency are greatly suppressed by the quenching processing. Awell-saturated ferroelectric hysteresis loop with a large remnant polarization (2Pr=23.5μC/cm2) is observed with an applied field of 155kV/cm. Temperature-dependent magnetic property is investigated and weak ferromagnetism with a remnant magnetization of 4×10−6μB/Fe at 10K is established. These results may have implications for further studies on multiferroics.
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【期刊论文】Integrated switchable reflectors based on periodically poled acoustic superlattice LiNbO3
陈延峰
,-0001,():
-1年11月30日
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