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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Theoretical study of surface acoustic waves in (n11) GaAs-cuts
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Theoretical study of surface acoustic waves in (n11) GaAs-cuts

机译：（n11）GaAs切口中的表面声波的理论研究

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摘要

The propagation characteristics of true and leaky or pseudonsurface acoustic waves (TSAW and PSAW=LSAW) on (n11) GaAs-cuts, n=1, 2,n3 and 4, are theoretically calculated as a function of propagationndirection. They include phase velocity (V), electromechanical couplingnconstant (K2), and attenuation factor (Α) of wavenpropagation on a metallized surface. The results show that PSAW modenvelocities are significantly higher than corresponding TSAW velocities,nand for certain propagation directions the attenuation factor isnextremely small (10-5 dB/Λ). Highly coupled PSAW modesnexist for propagation directions where the TSAW are very poorly coupled.nFor certain isolated directions, attenuation of the wave is nulln(Α=0), PSAW becoming a non-leaky SAW with partial polarization.nAnd in this case the corresponding TSAW are decoupled from the surfacenelectric excitation. Analysis of relations between various modes (TSAW,nPSAW and SSBW, surface skimming bulk wave) is made with the help of theneffective surface permittivity function and the generalized slownessndiagram. A coupling constant definition different from the usualn2ΔV/V is used, its validity and application conditions arendiscussed
机译：理论上计算了真实的和泄漏的或伪表面声波（TSAW和PSAW = LSAW）在（n11）个GaAs切口n = 1、2，n3和4上的传播特性，作为传播方向的函数。它们包括在金属化表面上的波传播的相速度（V），机电耦合常数（K2）和衰减因子（Α）。结果表明，PSAW速度明显高于相应的TSAW速度，并且对于某些传播方向，衰减因子极小（10-5 dB /Λ）。对于TSAW耦合很差的传播方向，高度耦合的PSAW模式是不敏感的。n对于某些隔离的方向，波的衰减为null（Δ= 0），PSAW成为具有部分偏振的非泄漏SAW。在这种情况下，对应的TSAW与表面电激发解耦借助于有效的表面介电常数函数和广义的慢速关系图，分析了各种模式（TSAW，nPSAW和SSBW，表面掠过体波）之间的关系。使用不同于通常的n2ΔV/ V的耦合常数定义，讨论其有效性和应用条件

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