Nano Lett., Just Accepted Manuscript
DOI: 10.1021/nl503998v
Publication Date (Web): December 1, 2014
Copyright © 2014 American Chemical Society
http://pubs.acs.org/doi/abs/10.1021/nl503998v?journalCode=nalefdCombined with THz time-domain spectroscopy, THz near-field microscopy based on an atomic force microscope is a technique that, while challenging to implement, is invaluable for probing low-energy light-matter interactions of solid-state and biomolecular nanostructures, which are usually embedded in background media. Here, we experimentally demonstrate a broadband THz pulse near-field microscope that provides sub-surface nanoimaging of a metallic grating embedded in a dielectric film. The THz near-field microscope can obtain broadband nanoimaging of the sub-surface grating with a nearly frequency-independent lateral resolution of 90 nm, corresponding to ~λ/3300, at 1 THz, while the AFM only provides a flat surface topography.
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