利用相干CW辐射的太赫兹显微光谱学和成像
Microspectroscopy and Imaging in the THz Range Using Coherent CW Radiation
摘要：
提出了一种新的太赫兹近场光谱仪，它允许进行生物和医学研究与高光谱分辨率相结合的空间分辨率下降到1/100。在该装置中，比所使用的波长小得多的孔径被放置在非常靠近样品的光束中。样品由孔后的倏逝波探测。通过共焦显微镜测量的距离非常精确。我们使用单色源，提供强大的相干连续波辐射可调谐从50 GHz到1.5太赫兹。可以进行透射和反射实验，使我们能够研究水溶液中的固体和分子。生物组织的光谱研究的例子。
英文摘要：
A novel THz near-field spectrometer is presented which allows to perform biological and medical studies with high spectral resolution combined with a spatial resolution down to l/100. In the setup an aperture much smaller than the used wavelength is placed in the beam very close to the sample. The sample is probed by the evanescent wave behind the aperture. The distance is measured extremely accurate by a confocal microscope. We use monochromatic sources which provide powerful coherent cw radiation tuneable from 50 GHz up to 1.5 THz. Transmission and reflection experiments can be performed which enable us to study solids and molecules in aqueous solution. Examples for spectroscopic investigations on biological tissues are presented.
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