Abstract
Here we studied the perturbation of nanoparticles on the resonances in
deformed microcavities. Owing to the breaking of rotational symmetry in
deformed cavities, the field distributions are not uniform along the cavity
boundary and thus result in position dependent perturbation of a single
scatterer. Combined with the directional emission of deformed cavities, such
perturbation provides the possibility to detect the position of nanoparticle
in the far field. Our numerical example shows that a position change of the
nanoparticle in 100 nm on the boundary can induce a spectral shift of ${\sim}0.02$ nm, which can be easily resolved by a conventional
spectrometer.
© 2010 IEEE
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