Department of Mechano-Informatics, Graduate School of Information Science and Technology, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
Nanotechnology. 2012 Aug 10;23(31):315201. doi: 10.1088/0957-4484/23/31/315201. Epub 2012 Jul 13.
We propose a strain measurement method utilizing light scattered by a pair of nano-disks onto an elastomer sheet. Such nanoparticle pairs exhibit a scattering spectrum that is dependent on the gap distance and the incident light polarization. We utilized this behavior by forming nano-disk pairs with a diameter of 105 nm and a gap of 20-50 nm on a polydimethylsiloxane (PDMS) sheet so that the gap could be altered with strain. The axial direction of the nano-disk pair could be identified by finding the peak wavelength maximum while rotating the polarization angle. Under tensile strain, the peak wavelength decreased from 674 nm at a strain of 0% to 637 nm at a strain of 9.5%, with a peak-shift sensitivity of - 3.4 nm/% strain. Under compression strain, the peak wavelength increased from 681 nm at a strain of 0% to 705 nm at a strain of - 3.8%, and the peak-shift sensitivity was - 16 nm/% strain for strains of 0 to - 1%. These experimentally determined peak scattering wavelength positions and peak-shift directions are consistent with the simulation results. This method offers wireless measurements of in situ strain on a nanometric scale.
我们提出了一种利用一对纳米盘在弹性体薄片上散射的光进行应变测量的方法。这种纳米粒子对的散射光谱取决于间隙距离和入射光的偏振。我们通过在聚二甲基硅氧烷（PDMS）薄片上形成直径为 105nm 且间隙为 20-50nm 的纳米盘对来利用这种行为，使得间隙可以随应变而改变。通过旋转偏振角找到峰值波长最大值，可以确定纳米盘对的轴向。在拉伸应变下，峰值波长从应变为 0%时的 674nm 降低到应变为 9.5%时的 637nm，峰值位移灵敏度为-3.4nm/%应变。在压缩应变下，峰值波长从应变为 0%时的 681nm 增加到应变为-3.8%时的 705nm，应变从 0%到-1%时的峰值位移灵敏度为-16nm/%应变。这些实验确定的峰值散射波长位置和峰值位移方向与模拟结果一致。这种方法提供了纳米尺度上原位应变的无线测量。
