  The authors' recent Nature Photonics article titled "Compact Nano-Mechanical
Plasmonic Phase Modulators" [1] is reviewed which reports a new phase
modulation principle with experimental demonstration of a 23 {\mu}m long
non-resonant modulator having 1.5 {\pi} rad range with 1.7 dB excess loss at
780 nm. Analysis showed that by decreasing all dimensions, a low loss,
ultra-compact {\pi} rad phase modulator is possible. Application of this type
of nano-mechanical modulator in a miniature 2 x 2 switch is suggested and an
optical design numerically validated. The footprint of the switch is 0.5 {\mu}m
x 2.5 {\mu}m.
