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对金属纳米线结构中量子化的声学声子模式进行了详细的理论研究。利用柱形纳米线结构来描述以氧化铝为模板制备的金属镍纳米线。考虑器件结构中弹性声波对应的边界及连续条件,求解弹性波波动方程,可以得到纳米线结构中量子化的声学声子模式。发现量子化的声子能量和不同声子态之间的能量差会随着纳米线半径的减小而增大。在色散关系中,允许的声子模式位于q_zV_(Al2O3)这条直线的下方,这一特征不随纳米线半径的变化而改变。研究结果表明,金属纳米线系统在高频超声器件中具有潜在的应用前景。
A detailed theoretical study of the quantized acoustic phonon modes in metallic nanowire structures has been carried out. The columnar nanowire structure is used to describe the metallic nickel nanowires prepared using alumina as a template. Considering the boundaries and continuous conditions of the elastic acoustic wave in the device structure, the acoustic phonon mode of quantization in the nanowire structure can be obtained by solving the wave equation of elastic wave. The energy difference between the quantized phonon energy and the different phonon states is found to increase as the nanowire radius decreases. In the dispersion relation, the allowed phonon modes lie below the line q_zV_ (Al 2 O 3), which does not change with the nanowire radius. The results show that the metal nanowire system has potential application in high frequency ultrasound devices.