Nonlinear optical infrared microscopy with chemical specificity
Nonlinear optical infrared microscopy with chemical specificity
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DOI：
10.1063/1.3167286
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发表时间：
2009-06-29
影响因子：
4
通讯作者：
Lee, Jae Yong
中科院分区：
文献类型：
--
作者：
Lee, Eun Seong;Lee, Jae Yong
我们展示了一种非线性光学红外显微镜的实现，它能够以高空间分辨率进行化学特定成像。它利用目标材料的非线性折射，通过共振吸收的中红外辐射热诱导，并用短波长的近红外激光束探测。对油水混合物样品的O-H和C-H-2振动模式在两个不同的中红外波长进行了选择性成像，在数值孔径为0.5的条件下测得空间分辨率为1.1微米，这是常规红外显微镜所不能达到的。
We demonstrate a realization of nonlinear optical infrared microscopy that is capable of chemically specific imaging with high spatial resolution. It exploits the nonlinear refraction of the target material that is thermally induced by resonantly absorbed mid-infrared radiation and probed with a short wavelength near-infrared laser beam. The O-H and C-H-2 vibrational modes in a water-oil mixture sample are selectively imaged at two different midinfrared wavelengths and the spatial resolution is measured to be 1.1 mu m in the condition of numerical aperture 0.5, which is not attainable with conventional infrared microscopes.