Sound velocity, refractive index, and thickness measurement of thin films below room temperature.

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K17938
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Osaka University
• Principal Investigator: Nagakubo Akira 大阪大学, 基礎工学研究科, 特任助教(常勤) (70751113)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 音速 / 薄膜 / 温度依存性 / レーザー超音波 / GHz / ナノ薄膜 / 弾性率

Outline of Final Research Achievements

In this study, I have developed a method to accurately measure the sound velocity of functional materials, which are widely used in wireless communication devices such as cell phone. Using home built optics, I succeeded in observing ultrasound propagations in micro-order films with two different incident angle, which enable me to measure the sound velocity, refractive index, and film thickness of the film at the same time. Furthermore, I have measured the temperature dependence of acoustic properties of functional materials such as AlN and diamond. These results contribute to device design and give many important knowledge for material science.

Free Research Field

音響物理学