Özet:
A recent study [PRB 100, 075427 (2019)], finally,
demonstrated the plasmon-analog of refractive index
enhancement in metal nanostructures (MNSs), which has
already been studied in atomic clouds for several decades.
Here, we simply utilize this phenomenon for achieving
continuously-tunable enhanced Cherenkov radiation (CR)
in MNSs. Beyond enabling CR from slow-moving particles,
or increasing its intensity, the phenomenon can be used in
continuous-tuning of the velocity cutoff of particles contributing to CR. More influentially, this allows a continuously-tunable analysis of the contributing particles as if
the data is collected from many different detectors, which
enables data correction. The phenomenon can also be
integrated into lattice MNSs, for continuous medium tuning, where a high density of photonic states is present and
the threshold for the CR can even be lifted. Additionally,
vanishing absorption can heal radiation angle distortion
effects caused by the metallic absorption.
