声子线波导中的偏振模杂化与转换
Polarization mode hybridization and conversion in phononic wire waveguides
摘要：
亚波长横截面的声子线波导支持两种正交偏振模式：平面外运动主导的类瑞利模式和平面内运动主导的类洛夫模式，类似于光子波导中的横电模式和横磁模式。由于衬底材料的各向异性弹性，沿某些晶体学取向传播的声子的偏振态可以强烈杂化。在这里，我们实验研究的取向依赖模式杂交的声子线波导图案从GaN的蓝宝石薄膜。这种模式杂交允许使用为类瑞利模式设计的公共叉指电极来有效地致动压电非活性类洛夫模式，并且还使得能够在引导的横向模式之间进行片上偏振转换。这两个都是重要的芯片上实现复杂的声子电路。
英文摘要：
Phononic wire waveguides of subwavelength cross-section support two orthogonal polarization modes: the out-of-plane motion dominated Rayleigh-like and the in-plane motion dominated Love-like modes, analogous to transverse-electric and transverse-magnetic modes in photonic waveguides. Due to the anisotropic elasticity of the substrate material, the polarization states of phonons propagating along certain crystallographic orientations can strongly hybridize. Here we experimentally investigate the orientation-dependent mode hybridization in phononic wire waveguides patterned from GaN-on-sapphire thin films. Such mode hybridization allows efficient actuation of piezoelectrically inactive Love-like modes using common interdigital electrodes designed for Rayleigh-like modes, and further enables on-chip polarization conversion between guided transverse modes. Both are important for on-chip implementation of complex phononic circuits.
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