Realization of Ultrasonic Pulse-Echo Measurement at Nano-Scale Region Taking Advantage of Plasmonic Probe

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13828
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Materials/Mechanics of materials
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Matsuya Iwao 長岡技術科学大学, 工学研究科, 助教 (00514465)
• Co-Investigator(Renkei-kenkyūsha): IHARA Ikuo 長岡技術科学大学, 工学研究科, 教授 (80203280) ; ISHIBASHI Takayuki 長岡技術科学大学, 工学研究科, 教授 (20272635)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: レーザ超音波 / 近接場光 / 近接場光顕微鏡 / SNOM

Outline of Final Research Achievements

Laser ultrasonic technique is an excellent method as a non-contact and nondestructive evaluation for materials. However, being applied to the extremely small region of material, this method is limited by the diffraction limitation of irradiated pulsed laser. In this research, the method detecting ultrasound utilizing near-field light is presented. Near-field light is a non-propagating light that exists the region less than 1 μm. Scanning near-filed optical microscope (SNOM) is developed by modifying atomic force microscope (AFM). The ultrasound on the surface of the sample is detected by the scattered near-field light whose intensity is related to the distance between the sample surface and the probe tip. SNOM images under ultrasonic vibration are obtained and the deference of images is observed according to the intensity of the ultrasound. These results indicate the feasibility of detecting ultrasound using near-field light.

Free Research Field

計測工学