为了研究多层石墨烯对声表面波的放大作用, 分析了外加电场下石墨烯载流子的可变电导率, 研究了不同衬底下多层石墨烯声表面波放大器的放大性能。对比研究了ZnO和CdS为衬底的石墨烯声表面波放大器, 分别对其在不同载流子漂移速度下的放大倍数进行了研究。结果表明, 以ZnO为衬底, 载流子漂移速度大于且接近声表面波相速度时, 放大性能是最优的, α可以达到34.92 dB。

In order to study the amplification effect of multi-layer graphene on surface acoustic waves, the variable conductivity of graphene carriers was analyzed under an external electric field, and the amplification performance of multi-layer graphene surface acoustic wave amplifiers was studied under different substrates. The graphene surface acoustic wave amplifiers with ZnO and CdS substrates were compared and studied, and their magnifications under different carrier drift speeds were studied respectively. The results showed that, with ZnO as the substrate, when the carrier drift velocity was larger than and close to the surface acoustic wave phase velocity, the amplification performance was the best, and α could reach 34.92 dB.