Plasmon rulers are an emerging concept in
which the strong near-field coupling of plasmon nanoantenna
elements is employed to obtain structural information at the
nanoscale. Here, we combine nanoplasmonics and nanomagnetism
to conceptualize a magnetoplasmonic dimer
nanoantenna that would be able to report nanoscale distances
while optimizing its own spatial orientation. The latter
constitutes an active operation in which a dynamically
optimized optical response per measured unit length allows
for the measurement of small and large nanoscale distances
with about 2 orders of magnitude higher precision than current
state-of-the-art plasmon rulers. We further propose a concept to optically measure the nanoscale response to the controlled
application of force with a magnetic field.
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