Fig. 1.

Spatial resolution measured with a polymer interface sample a without and with an added lens in transmission mode [24] and b with a germanium attenuated total reflection crystal [22]. The measured spatial resolutions were a 16 μm and 11 μm respectively and b 3 μm across the interface. (a Reprinted with permission from [24] copyright 2013 American Chemical Society. b Reproduced from [22] with permission from the Royal Society of Chemistry)