Suppression of Brillouin oscillation in transparent free-standing diamond thin films in picosecond ultrasound

被引：1
|
作者：
Weng, H. K. [1 ]
Nagakubo, A. [1 ]
Watanabe, H. [2 ]
Ogi, H. [1 ]
机构：
[1] Osaka Univ, Grad Sch Engn, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan
[2] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan
来源：
APPLIED PHYSICS LETTERS | 2022年 / 120卷 / 11期
关键词：
38;
D O I：
10.1063/5.0087648
中图分类号：
O59 [应用物理学];
学科分类号：
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 a 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 a high capability for sensor applications. Published under an exclusive license by AIP Publishing.
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页数：5
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