A Feasibility Study on Generation of Acoustic Waves Utilizing Near-Field Optics
A Feasibility Study on Generation of Acoustic Waves Utilizing Near-Field Optics
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利用近场光学产生声波的可行性研究
DOI：
10.1088/1742-6596/520/1/012003
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
and Ikuo Ihara
中科院分区：
文献类型：
--
作者：
Iwao Matsuya;Kento Matozaki;Akira Kosugi;and Ikuo Ihara
提出了一种利用倏逝光产生声波的新方法。倏逝光是一种不传播的电磁波，随着距离形成光的全内反射的表面的距离呈指数衰减。本研究利用棱镜表面全内反射的倏逝光在铝中产生声波，并讨论了超声测量的可行性。使用功率密度为0.36 J/ cm2的脉冲Nd: YAG激光器，将全内反射入射角设置为69.0，产生倏逝光。实验证明，用倏逝光产生的声波振幅约为传统脉冲激光产生的声波振幅的1/14。这揭示了使用激光超声技术与近场光学的可能性。
A new approach of generating acoustic waves utilizing evanescent light is presented. The evanescent light is a non-propagating electromagnetic wave that exhibits exponential decay with distance from the surface at which the total internal reflection of light is formed. In this research, the evanescent light during total internal reflection at prism surface is utilized for generating acoustic waves in aluminium and the feasibility for ultrasonic measurements is discussed. Pulsed Nd: YAG laser with 0.36 J/cm 2 power density is used and the incident angle during the total internal reflection is arranged to be 69.0 for generating the evanescent light. It has been demonstrated that the amplitude of the acoustic waves by means of evanescent light is about 1/14 as large as the one generated by the conventional pulsed laser. This reveals the possibility of using a laser ultrasonic technique with near-field optics.