2022/03/10 by Hsu Kai Weng, Akira Nagakubo, Hideyuki Watanabe +1 · 3 citations
Chemistry · Engineering · Physics and Astronomy · #Advanced Fiber Optic Sensors #Amplitude #Brillouin scattering #Brillouin zone #Chemistry #Composite material #Diamond #Laser #Materials science #Mechanical and Optical Resonators #Nanotechnology #Optics #Optoelectronics #Oscillation (cell signaling) #Phase (matter) #Physics #Picosecond #Pulse (music) #Thin film #Ultrasonics and Acoustic Wave Propagation #physics.app-ph
paper · pdf · doi:10.1063/5.0087648
published in Applied Physics Letters 120(11), 112203 (American Institute of Physics)
arxiv created 2022/03/10 · arxiv updated 2022/03/11 · openalex publication_date 2022/03/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
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.