Interferometric pump-probe characterization of the nonlocal response of optically transparent ion implanted polymers

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• 作者：Ivan L. Stefanov^a ; Georgi B. Hadjichristov^b ; ^{georgibh@issp.bas.bg}
• 关键词：Ion implanted polymers ; Interferometry ; Optical phase shift ; Photo-thermooptic effect ; Polymethylmethacrylate (PMMA) ; Materials science
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 March, 2012
• 卷：258
• 期：10
• 页码：4770-4776
• 文件大小：1852 K

摘要

Optical interferometric technique is applied to characterize the nonlocal response of optically transparent ion implanted polymers. The thermal nonlinearity of the ion-modified material in the near-surface region is induced by continuous wave (cw) laser irradiation at a relatively low intensity. The interferometry approach is demonstrated for a subsurface layer of a thickness of about 100 nm formed in bulk polymethylmethacrylate (PMMA) by implantation with silicon ions at an energy of 50 keV and fluence in the range 10¹⁴-10¹⁷ cm^鈭?. The laser-induced thermooptic effect in this layer is finely probed by interferometric imaging. The interference phase distribution in the plane of the ion implanted layer is indicative for the thermal nonlinearity of the near-surface region of ion implanted optically transparent polymeric materials.