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

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-oscilla...

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Veröffentlicht in:arXiv.org 2022-03
Hauptverfasser: Hsu, Kai Weng, Nagakubo, Akira, Watanabe, Hideyuki, Ogi, Hirotsugu
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Sprache:eng
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Zusammenfassung: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.
ISSN:2331-8422
DOI:10.48550/arxiv.2203.05264