Frequency-Comb-Referenced Phase Spectroscopy Measures Plasmonic Dynamics with Picometre Resolution

A 1.94-Å dynamic motion of plasmonic nanohole array was measured with a 1.67 pm resolution using a frequency comb as the light source. This frequency-comb-referenced plasmonic phase spectroscopy could provide high speed, high resolution, and traceability to a time standard. © 2019 The Author(s)