This PDF file includes:

• fig. S1. Determination of phase and group velocity of SR-SPPs.
• Legends for movies S1 and S2

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Other Supplementary Material for this manuscript includes the following:

• movie S1 (.avi format). Nanofocusing movie experiment.
• movie S2 (.mp4 format). Nanofocusing movie theory.

movie files S1 and S2