1 February 2012 Multimodal spatially resolved near-field scattering and absorption spectroscopy
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Abstract
Far-field microscopy techniques are routinely used for the visualization of biological systems, but are limited according to Abbe`s criteria to about λ/2. The objective of this work is to integrate a solid immersion lens (SIL) as a near-field probe into a standard microscope spectrophotometer in order to perform polychromatic illumination near-field microscopy as well as near-field spectroscopy. The SIL concept can achieve a higher resolution than expected by the increase of the numerical aperture. Even with a tip diameter of 700nm and a tip point angle of 130° the lateral resolution is in the range of about 30 nm, therefore overcoming the tradeoff between the resolution and intensity restrictions in aperture limited SNOM probes. In this paper the optical setup of the system is described and some images of biological samples on a nanoscale with high contrast are presented.
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Edwin Ostertag, Tobias Merz, Rudolf W. Kessler, "Multimodal spatially resolved near-field scattering and absorption spectroscopy", Proc. SPIE 8231, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications VIII, 82310A (1 February 2012); doi: 10.1117/12.909086; https://doi.org/10.1117/12.909086
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