皮秒超声下透明自支撑金刚石薄膜布里渊振荡的抑制
Suppression of Brillouin oscillation in transparent free-standing diamond thin films in picosecond ultrasound
摘要：
在皮秒超声中，由于运动应变脉冲的后向散射，透明样品出现布里渊振荡。它的振幅与其他响应，如脉冲回波信号和通过厚度共振，模糊这些非布里渊振荡响应。我们发现，在透明的自支撑薄膜的两侧涂上适当厚度的金属薄膜，可以抑制布里渊振荡，这种特殊的行为是由两侧产生的具有微小相位差的应变脉冲引起的。这种现象使我们能够制备出无布里渊振荡的金刚石自支撑膜，这表明了传感器应用的高性能。
英文摘要：
Brillouin oscillation appears in picosecond ultrasonics for a transparent specimen because of backward light scattering by moving strain pulse. Its amplitude is comparable with those of other responses, such as pulse-echo signals and through-thickness resonance, obscuring these non-Brillouin-oscillation responses. We here find that Brillouin oscillation can be suppressed in a transparent free-standing film by coating both sides with metallic thin film of appropriate thickness and that this peculiar behavior is caused by strain pulses generated on both sides with a slight phase difference. This phenomenon allowed us to fabricate a Brillouin-oscillation-free diamond free-standing film, which showed high capability for sensor applications.
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