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Taking Sub-Cycle THz Nanoscopy to the Limits

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Abstract

We combine ultrafast field-resolved terahertz spectroscopy with scattering-type near-field scanning optical microscopy to access sub-optical-cycle dynamics on the nanoscale. We trace the oscillating electric near field from a (10 nm)3 volume on the surface of an indium arsenide nanowire with 10 fs temporal resolution, revealing the formation of a depletion layer on the nanowire surface [1]. Furthermore, we apply ultrafast terahertz nanoscopy to strained vanadium dioxide nanobeams and observe a previously unseen correlation between the local steady-state phase-switching susceptibility and the ultrafast response to below threshold photoexcitation [2]. Our findings point towards a nanoscale periodic strain profile that is frozen into the VO2 insulating state.

© 2016 Optical Society of America

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